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  Subjects -> ENGINEERING (Total: 2415 journals)
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ENGINEERING (1273 journals)                  1 2 3 4 5 6 7 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 8)
3D Research     Hybrid Journal   (Followers: 21)
AAPG Bulletin     Hybrid Journal   (Followers: 8)
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Abstract and Applied Analysis     Open Access   (Followers: 3)
Aceh International Journal of Science and Technology     Open Access   (Followers: 4)
ACS Nano     Hybrid Journal   (Followers: 289)
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Acta Universitatis Cibiniensis. Technical Series     Open Access  
Active and Passive Electronic Components     Open Access   (Followers: 7)
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Applicable Algebra in Engineering, Communication and Computing     Hybrid Journal   (Followers: 2)
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at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
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Avances en Ciencias e Ingeniería     Open Access  
Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
Bangladesh Journal of Scientific and Industrial Research     Open Access  
Basin Research     Hybrid Journal   (Followers: 5)
Batteries     Open Access   (Followers: 6)
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Bell Labs Technical Journal     Hybrid Journal   (Followers: 28)
Beni-Suef University Journal of Basic and Applied Sciences     Open Access   (Followers: 4)
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BER : Survey of Business Conditions in Retail : An Executive Summary     Full-text available via subscription   (Followers: 3)
Beyond : Undergraduate Research Journal     Open Access  
Bhakti Persada : Jurnal Aplikasi IPTEKS     Open Access  
Bharatiya Vaigyanik evam Audyogik Anusandhan Patrika (BVAAP)     Open Access   (Followers: 1)
Bilge International Journal of Science and Technology Research     Open Access  
Biofuels Engineering     Open Access   (Followers: 1)
Biointerphases     Open Access   (Followers: 1)
Biomaterials Science     Full-text available via subscription   (Followers: 11)
Biomedical Engineering     Hybrid Journal   (Followers: 15)
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Biomedical Engineering Letters     Hybrid Journal   (Followers: 5)
Biomedical Engineering, IEEE Reviews in     Full-text available via subscription   (Followers: 21)
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BioNanoMaterials     Open Access   (Followers: 2)
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Bitlis Eren University Journal of Science and Technology     Open Access  
Boletin Cientifico Tecnico INIMET     Open Access  
Botswana Journal of Technology     Full-text available via subscription   (Followers: 1)
Boundary Value Problems     Open Access   (Followers: 1)
Brazilian Journal of Science and Technology     Open Access   (Followers: 2)
Broadcasting, IEEE Transactions on     Hybrid Journal   (Followers: 12)
Bulletin of Canadian Petroleum Geology     Full-text available via subscription   (Followers: 13)
Bulletin of Engineering Geology and the Environment     Hybrid Journal   (Followers: 14)
Bulletin of the Crimean Astrophysical Observatory     Hybrid Journal  
Cahiers Droit, Sciences & Technologies     Open Access  
Calphad     Hybrid Journal   (Followers: 2)
Canadian Geotechnical Journal     Hybrid Journal   (Followers: 31)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 44)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 6)
Case Studies in Thermal Engineering     Open Access   (Followers: 6)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
Catalysis Reviews: Science and Engineering     Hybrid Journal   (Followers: 7)
Catalysis Science and Technology     Free   (Followers: 8)
Catalysis Surveys from Asia     Hybrid Journal   (Followers: 3)
Catalysis Today     Hybrid Journal   (Followers: 7)
CEAS Space Journal     Hybrid Journal   (Followers: 2)
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal  
Chaos : An Interdisciplinary Journal of Nonlinear Science     Hybrid Journal   (Followers: 2)
Chaos, Solitons & Fractals     Hybrid Journal   (Followers: 3)
Chinese Journal of Catalysis     Full-text available via subscription   (Followers: 2)
Chinese Journal of Engineering     Open Access   (Followers: 2)
Chinese Science Bulletin     Open Access   (Followers: 1)
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Ciencias Holguin     Open Access   (Followers: 3)
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CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
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City, Culture and Society     Hybrid Journal   (Followers: 22)
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Clean Air Journal     Full-text available via subscription   (Followers: 1)
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Combustion, Explosion, and Shock Waves     Hybrid Journal   (Followers: 15)
Communications Engineer     Hybrid Journal   (Followers: 1)
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Journal Cover
Catalysis Communications
Journal Prestige (SJR): 0.929
Citation Impact (citeScore): 3
Number of Followers: 6  
 
  Hybrid Journal Hybrid journal (It can contain Open Access articles)
ISSN (Print) 1566-7367
Published by Elsevier Homepage  [3161 journals]
  • Regulation of polar microenvironment on the surface of tertiary amines
           functionalized polyacrylonitrile fiber and its effect on catalytic
           activity in Knoevenagel condensation
    • Abstract: Publication date: Available online 17 September 2018Source: Catalysis CommunicationsAuthor(s): Lishuo Zheng, Pengyu Li, Minli Tao, Wenqin ZhangAbstractTwo fiber supported tertiary amine catalysts were prepared by immobilization of 3-dimethylamino-1-propylamine (PANDF) and 1 (PANTF) on polyacrylonitrile fiber. Both fiber catalysts contain polar microenvironments constructed by amide groups, tertiary amine groups and unreacted cyano groups. The difference between the two catalysts lies in that the PANDF contains hydrogen bond network while the PANTF does not. Employing Knoevenagel condensation as a model reaction, the cooperative action of immobilized tertiary amines with hydrogen bonds was evaluated in detail. At the same time, the aggregation of reactants in the polar microenvironment under different solvents was also investigated. The results showed that hydrogen bonds and the supporting basic groups can promote the reaction by the synergistic catalytic effect in most solvents. The catalysts displayed different catalytic behaviors in solvents with different polarities. The catalysts can achieve highly efficient catalytic activity in the more polar solvents which were well compatible with the catalysts. Moreover, the reaction can also occur in less polar solvents due to their incompatible property with the fiber catalysts, which can compel the polar reactants to accumulate on the fiber surface with strong polar microenvironment.
       
  • Synthesis of chiral polyurethanes of cinchona alkaloids for the
           enantioselective synthesis in asymmetric catalysis
    • Abstract: Publication date: Available online 17 September 2018Source: Catalysis CommunicationsAuthor(s): Bahati Thom Kumpuga, Shinichi ItsunoChiral polyurethanes of cinchona alkaloid were synthesized via repetitive Mizoroki-Heck (MH) coupling reaction. The Pd-catalyzed polycondensation of cinchona urethane dimers and aromatic diiodides afforded the chiral polyurethanes. The chiral polyurethane bearing free OH group at the C6’ position of the quinoline ring in the cinchona alkaloid unit showed high catalytic activities and excellent enantioselectivities (up to 97% ee) in the Michael addition reactions.Graphical abstractUnlabelled Image
       
  • Enantioselective epoxidation of styrene with TBHP catalyzed by
           bis(oxazoline)–vanadyl–laponite materials
    • Abstract: Publication date: Available online 12 September 2018Source: Catalysis CommunicationsAuthor(s): Marwa Fadhli, Ilyes Khedher, José M. FraileAbstractBis(oxazoline)-vanadyl complexes have been prepared from two precursors, VO(acac)2 and VOSO4, and immobilized on laponite by cation exchange. These catalysts have been tested in the enantioselective epoxidation of styrene with TBHP. The catalytic activities are always much higher in the case of VO(acac)2. The ligand improves the catalytic activity, with similar or slightly better selectivity to styrene oxide (up to 42%) and up to 63% ee in solution. Laponite support is also beneficial in most cases, with selectivities to styrene oxide up to 60%. Moderate enantioselectivities are obtained, better with VOSO4 solids, up to 72% ee.
       
  • Cu+bimetallic+catalysts+with+lower+metal+loadings&rft.title=Catalysis+Communications&rft.issn=1566-7367&rft.date=&rft.volume=">CO2 hydrogenation to methanol on PdCu bimetallic catalysts with lower
           metal loadings
    • Abstract: Publication date: Available online 12 September 2018Source: Catalysis CommunicationsAuthor(s): Xiao Jiang, Yang Jiao, Colton Moran, Xiaowa Nie, Yutao Gong, Xinwen Guo, Krista S. Walton, Chunshan SongA series of PdCu bimetallic catalysts with a wide range of total loadings (i.e., 2.4–18.7 wt%, Pd/(Pd + Cu) = 0.34 at at−1) were prepared and evaluated on CO2 hydrogenation to CH3OH (Methanol). A key observation is the retention of bimetallic promotion of CH3OH at lower metal loadings. Pd-Cu(2.4)/SiO2, which contains the lowest metal loading, yields ~1.6× more CH3OH than the commercial Cu-ZnO-Al2O3 catalyst with respect to metal-based space time yield (STY) at 523 K and 4.1 MPa. However, an enhancement in CO production is realized. Combined with the characterization results, the size effect-surface alloy composition-catalytic performance relationship was discussed. This work provides insights in designing cost-effective PdCu catalysts with lower metal loadings for CH3OH sysnthesis via CO2 hydrogenation.Graphical abstractUnlabelled Image
       
  • Sub-nanometric Rh decorated magnetic nanoparticles as reusable catalysts
           for nitroarene reduction in water
    • Abstract: Publication date: Available online 11 September 2018Source: Catalysis CommunicationsAuthor(s): M. Nasiruzzaman Shaikh, Aasif Helal, Abdul Nasar Kalanthoden, Basmah Najjar, Md. Abdul Aziz, Hatim D. MohamedEstablishing a method of reduction of nitroarenes into corresponding amines in water without using flammable sodium borohydride or toxic hydrazine as hydrogen source, is quite challenging. Here, we show for the first time the propensity of sub-nanometric rhodium nanoparticles (< 1 nm) supported on ultra-small magnetic nanoparticles (8–10 nm), as reusable catalyst for the nitroarene reduction in aqueous medium using tetrahydroxydiboron (THDB) as reductant.Graphical abstractUnlabelled Image
       
  • Role of the Fe oxidation states on the catalytic oxy-dehydrogenation of
           ethylbenzene using CO2 as a soft oxidant over FeOx/carbon-alumina
    • Abstract: Publication date: Available online 11 September 2018Source: Catalysis CommunicationsAuthor(s): Venkata Ramesh Babu Gurram, Siva Sankar Enumula, Kumara Swamy Koppadi, Raji Reddy Chada, David Raju Burri, Seetha Rama Rao KamarajuIron oxide (FeOx) supported on 1:3 carbon-alumina (ICA) was prepared by wet impregnation method. Oxidized and reduced forms of Fe in ICA catalyst were achieved by diluted H2O2 and hydrazine hydrate treatments, respectively. Three different oxidation states of Fe present in magnetite (Fe2+ and Fe3+), hematite (Fe3+) and wüstite (Fe2+) were confirmed by XPS, powder-XRD, H2-TPR, TGA, NH3-TPD and N2-physisorption analysis. Among the synthesized catalysts, in comparison with hematite and wüstite phases, magnetite phase offered high catalytic activity in ethylbenzene dehydrogenation reaction. The presence of CO2 in the reaction mixture was found to leave intact the activated carbon support structure.Graphical abstractUnlabelled Image
       
  • The distinct catalytic behaviours of calcium silicate hydrate for the high
           selectivity of 2,2′-isomer in reaction of phenol with formaldehyde
    • Abstract: Publication date: Available online 11 September 2018Source: Catalysis CommunicationsAuthor(s): Xinnian Xia, Yingzhuang Xu, You Chen, Yutang Liu, Yanbing LuThe acidity and basicity of the catalyst have an important influence on the distribution of isomers. Herein, we prepared calcium silicate hydrate and used it for the reaction of phenol with formaldehyde to bisphenol F. The results showed that basic calcium silicate hydrate has a very high selectivity for 2,2′-isomer, which is not obvious in the presence of acidic catalysts. The highest selectivity to 2,2′-isomer (94.67%) and yield (51.33%) for bisphenol F were achieved over calcium silicate hydrate (Si/Ca = 3) catalyst at 383 K for 120 min. A possible mechanism was proposed in accordance with our examination. Changing the acidity and basicity of catalyst provides a way to improve the purity of isomers.Graphical abstractHydroxyalkylation of phenol and formaldehyde to bisphenol F over CSH.Unlabelled Image
       
  • Enhanced low-temperature NO oxidation by iron-modified MnO2
           catalysts
    • Abstract: Publication date: Available online 11 September 2018Source: Catalysis CommunicationsAuthor(s): Jingbo Jia, Rui Ran, Xingguo Guo, Xiaodong Wu, Wei Chen, Duan WengAbstractSeries of Fe-modified MnO2 catalysts were prepared to improve low-temperature NO oxidation. Introduction of Fe3+ resulted in a phase transformation from α-MnO2 to ε-MnO2. Hexagonal Fe0.32MnO2 exhibited the highest activity with the lowest T50 of 156 °C and the maximum NO conversion of 80% at 250 °C. It also possessed the best reducibility and abundant readily available oxygen species, which facilitated the oxidation of NO. Major differences in the NO oxidation reaction route between α-MnO2 and Fe0.32MnO2 were the adsorption sites and the type of intermediates. The synergetic effect between Fe and Mn enhances the activation of NO and O2.
       
  • Aromatization of hydrocarbons by oxidative dehydrogenation catalyzed by
           nickel porphyrin with molecular oxygen
    • Abstract: Publication date: Available online 10 September 2018Source: Catalysis CommunicationsAuthor(s): Xuan Dai, Dongwei Chen, Weiyou Zhou, Song Yang, Fu'an Sun, Junfeng Qian, Mingyang He, Qun ChenSome metalloporphyrins (MTPPs, M = Ni, Fe, Co, and Cu) have been introduced as catalysts for the dehydrogenative aromatization of hydrocarbons using molecular oxygen as the ultimate oxidant. The results revealed that NiTPP could efficiently catalyze the dehydroaromatization of 9,10-dihydroanthracene by O2 to anthracene, and various substrates could be tolerated. According to the obtained results, a possible reaction pathway for the aerobic dehydrogenative aromatization of hydrocarbons under nickel porphyrin has been proposed.Graphical abstractUnlabelled Image
       
  • Oxidative conversion of lignin over cobalt-iron mixed oxides prepared via
           the alginate gelation
    • Abstract: Publication date: Available online 5 September 2018Source: Catalysis CommunicationsAuthor(s): L. Hdidou, L. Kouisni, B. Manoun, H. Hannach, A. Solhy, A. BarakatThe depolymerization of polymer lignin model to low molecular weight products was studied in water, at 200 °C under 100 MPa of 10% O2 using cobalt-iron mixed oxides as catalysts. These nanostructured oxides with different Co/Fe ratios were prepared via alginate gelation. X-ray diffraction, scanning electron microscope, and size exclusion chromatography were used to study the influence of the Fe/Co ratios on the structure and the proprieties of the oxides as well as the morphology, the structure, and the composition of the obtained degraded products. The results showed that the oxides used in this study were versatile catalysts with a high catalytic activity for lignin depolymerization. Furthermore, these oxides demonstrated high yield and high selectivity towards aromatic compounds.Graphical abstractUnlabelled Image
       
  • Towards optical application of metal-organic frameworks: Cu-MOFs as sole
           heterogeneous photocatalyst for arylation of phenols at room temperature
    • Abstract: Publication date: Available online 2 September 2018Source: Catalysis CommunicationsAuthor(s): Hiep Q. Ha, Huong T.D. Nguyen, Trang H.M. Pham, Vu T. Pham, Thanh TruongAn efficient heterogeneous catalytic system for photoinduced arylation of phenols has been developed. The method utilized Cu2(BDC)2(DABCO) (BDC = benzene-1,4-dicarboxylate; DABCO = 1,4-diazabicyclo[2.2.2]octane) as sole photocatalyst. Optimal results were obtained when tBuOLi base, acetylacetone as ligand, and CH3CN solvent were employed in the presence of 365 nm light. Preliminary control experiments to elucidate structure/activity relationship confirmed the contribution of copper metal, BDC linker, and DABCO ligand. Furthermore, the catalyst is heterogeneous and could be recycled for at least 7 times.Graphical abstractUnlabelled Image
       
  • A dual-functional way for regenerating NH3-SCR catalysts while enhancing
           their poisoning resistance
    • Abstract: Publication date: Available online 1 September 2018Source: Catalysis CommunicationsAuthor(s): Yuejun Wang, Dongjie Ge, Meixiu Chen, Shan Gao, Zhongbiao WuA new regeneration method was developed for reactivating poisoned commercial catalysts (V2O5-WO3/TiO2) for the NH3-SCR reaction. The proposed regeneration method can wash out poisons in relatively mild conditions, and also in situ enhance their further resistance towards alkali poisons, SO2 and H2O. To the best of our knowledge, no examples of regeneration methods with these dual functions have been reported. Characterization results showed that the new regeneration method reduces the loss of active components and significantly improves the surface acidity, thus enhancing the resistance to poisons in further deNOx operation.Graphical abstractUnlabelled Image
       
  • Basic mesoporous zeolite ETS-10 supported Ni catalyst with bi-functional
           properties for efficiently catalyzing arenes fluorination
    • Abstract: Publication date: Available online 31 August 2018Source: Catalysis CommunicationsAuthor(s): Chaojie Zhu, Runsheng Shen, Zhongxue Fang, Lei Zhang, Dongfang Wu, Mengyu Wu, Tiandi Tang, Wenqian Fu, Qun ChenBasic mesoporous zeolite ETS-10 (ETS-10-M) with high surface area (366 m2·g−1) and large mesopores volume (0.21 cm3·g−1) is synthesized by templated with an organosilan surfactant. After loading of Ni species and calcination, the obtained Ni/ETS-10-M as a bi-functional catalyst shows high activity and good product selectivity in the fluorination of N-aryl amides with N-fluorobenzenesulfonimide (NFSI). The Ni2+ species in Ni/ETS-10-M facilitate the formation of fluorine radical from NFSI, and the basic sites in Ni/ETS-10-M favour N-aryl amide transformation into corresponding carbon-radical, and reacted with fluorine radical to form the desired product. Ni/ETS-10-M catalyst exhibits good catalytic activity even it reused seven times.Graphical abstractUnlabelled Image
       
  • Selective CO hydrogenation over bimetallic Co-Fe catalysts for the
           production of light paraffin hydrocarbons (C2-C4): Effect of H2/CO ratio
           and reaction temperature
    • Abstract: Publication date: Available online 30 August 2018Source: Catalysis CommunicationsAuthor(s): Seong Bin Jo, Ho Jin Chae, Tae Young Kim, Chul Ho Lee, Ji Un Oh, Suk-Hwan Kang, Joon Woo Kim, Moon Jeong, Soo Chool Lee, Jae Chang KimSynthetic natural gas (SNG) from syngas is considered a promising substitute for fossil fuels because of its environmental advantages; however, its heating value is below the standard heating value (especially in South Korea and Japan). In this study, bimetallic Co-Fe catalysts were developed for the production of C2-C4 hydrocarbons for usage as mixing gases to improve the heating value of SNG. The effect of the process conditions on the catalytic behavior was investigated. Catalyst 5Co-15Fe/γ-Al2O3 showed the best results with 91.2% CO conversion, 28.2% C2-C4 selectivity, and 0.98 paraffin ratio at H2/CO = 3.0 and 300 °C.Graphical abstractUnlabelled Image
       
  • Promoting effect of 4-dimethylaminopyridine on selective oxidation of
           benzyl alcohol over MoVTeNb mixed oxides
    • Abstract: Publication date: Available online 29 August 2018Source: Catalysis CommunicationsAuthor(s): Konstantin Yu. Koltunov, Evgeniya V. Ishchenko, Vladimir I. SobolevA liquid phase oxidation of benzyl alcohol with 1 atm molecular oxygen catalyzed by MoVTeNb mixed oxides has been investigated. It is demonstrated that 4-dimethylaminopyridine (DMAP) acting as a co-catalyst, notably accelerates the reaction, as well as influences the ratio of the reaction products (benzaldehyde, benzyl benzoate and benzoic acid). The findings can be interpreted in terms of the involvement of DMAP (a good enough N-nucleophile) in the process of chemo-desorption of oxygenates formed on the catalyst surface.Graphical abstractUnlabelled Image
       
  • Dry reforming of methane over Zr- and Y-modified Ni/Mg/Al double-layered
           hydroxides
    • Abstract: Publication date: Available online 28 August 2018Source: Catalysis CommunicationsAuthor(s): Katarzyna Świrk, Maria Elena Gálvez, Monika Motak, Teresa Grzybek, Magnus Rønning, Patrick Da CostaZr- and Y-promoted Ni/Mg/Al double-layered hydroxides were investigated in dry reforming of methane, DRM (10% CH4, CH4/CO2 = 1, GHSV = 20,000 h−1) for the first time. Modification of the double-layered hydroxides with 5 wt% of zirconium and 0.4 wt% of yttrium resulted in the formation of ZrO2-Y2O3 solid solution, which largely contributed to the enhancement of catalyst's stability with time-on-stream at 700 °C in DRM. Also, the modified catalyst demonstrated the limitation of the reverse WGS reaction, as confirmed by powder XRD due to the absence of the rhombohedral hydrotalcite structure.Graphical abstractUnlabelled Image
       
  • Non-isothermal decomposition of platinum acetylacetonate as a
           cost-efficient and Size-Controlled Synthesis of Pt/C nanoparticles
    • Abstract: Publication date: Available online 27 August 2018Source: Catalysis CommunicationsAuthor(s): A.A. Kulbakov, A.B. Kuriganova, M. Allix, A. Rakhmatullin, N.V. Smirnova, O.A. Maslova, I.N. LeontyevA simple two-stage synthesis of Pt/C nanoparticles based on the non-isothermal decomposition of platinum acetylacetonate is presented. It allows not only production of Pt nanoparticles, but also their sizes control during the synthesis. The heating rate is the key factor for tuning the average Pt nanoparticle size. The electrochemical surface area of produced nanoparticles enlarges with rising heating rate, which can enrich 103 m2/g. The growth dynamics of Pt/C nanoparticles is tracked via in-situ XRD. Furthermore, the electrocatalytic activity of Pt/C catalysts is studied as a function of platinum particle size in cases of ethanol electro-oxidation and oxygen reduction reactions.Graphical abstractUnlabelled Image
       
  • Oxygen-promoted Suzuki–Miyaura reaction of aryl fluorosulfates and
           potassium aryltrifluoroborates: Mild and efficient access to biaryls and
           terphenyls
    • Abstract: Publication date: Available online 24 August 2018Source: Catalysis CommunicationsAuthor(s): Xinmin Li, Yunhai Ma, Qinghong Hu, Bo Jiang, Qing Wu, Zeli YuanA mild and efficient protocol has been developed for the Suzuki–Miyaura reaction of aryl fluorosulfates and potassium aryltrifluoroborates at room temperature. A series of biaryls can be prepared with excellent yields in this system and an aerobic atmosphere demonstrates a positive effect on the reactivity of the cross-coupling reactions. Additionally, this method can be extended to one-pot double Suzuki–Miyaura reactions, allowing the synthesis of various unsymmetrical terphenyls in moderate to good yields.Graphical abstractUnlabelled Image
       
  • Recyclable MeOPEG-clicked TEMPO catalyst for one-pot aerobic double
           dehydrogenation of alcohols to nitriles
    • Abstract: Publication date: Available online 23 August 2018Source: Catalysis CommunicationsAuthor(s): Tamilselvi ChinnusamyIn this study, TEMPO was efficiently grafted on MeOPEG support by copper-catalyzed (3 + 4) cycloaddition reaction. The newly immobilized MeOPEG-clicked TEMPO catalyst was characterized by NMR, IR, and MALDI-TOF. Subsequently, it was used for one-pot aerobic double dehydrogenation of alcohols to nitriles using aqueous ammonia as the nitrogen source and O2 (1 atm) as the terminal oxidant. The catalytic efficiency was also reported with various benzyl, alkyl, and heteroaromatic alcohols. The reactivity of this catalyst is comparable with that of unmodified TEMPO. Furthermore, the new MeOPEG-clicked TEMPO catalyst could be easily recovered by precipitation and recycled up to five runs.Graphical abstractUnlabelled Image
       
  • Fully-sulfonated hydrated UiO66 as efficient catalyst for ethyl levulinate
           production by esterification
    • Abstract: Publication date: Available online 23 August 2018Source: Catalysis CommunicationsAuthor(s): Luca Desidery, Mekhman S. Yusubov, Serge Zhuiykov, Francis VerpoortPartially and fully sulfonated UiO66 derivatives, along with the non-functionalized MOF, were synthetized by one-step solvothermal synthesis. Structural, acid and porous properties were investigated before and after dehydration and thermal activation processes. Hydrated, dehydrated and thermally activated materials were screened as a heterogeneous catalyst towards the esterification of levulinic acid with ethanol in order to determine the effects of the exposed acid functionalities amount and hydration. The hydrated fully sulfonated UiO66 presented the highest activity and resulted to be more efficient than commercial Amberlyst 15. It also demonstrated high stability and recyclability in consecutive reaction runs.Graphical abstractUnlabelled Image
       
  • Improvement in the activity and enantioconvergency of PvEH3, an epoxide
           hydrolase from Phaseolus vulgaris, for p-chlorostyrene oxide by
           site-saturation mutagenesis
    • Abstract: Publication date: Available online 22 August 2018Source: Catalysis CommunicationsAuthor(s): Bo-Chun Hu, Chuang Li, Rui Wang, Xun-Cheng Zong, Jin-Ping Li, Jian-Fang Li, Min-Chen WuTo further improve the activity and enantioconvergency of PvEH3G170E for racemic (rac-) p-chlorostyrene oxide (pCSO), its F187 was randomly substituted by saturation mutagenesis. The double-site variants of pveh3, pET-28a-pveh3G170E/F187X (X: any one of 20 residues), were transformed into E. coli BL21(DE3), thereby constructing a mutagenesis library (E. coli/pveh3G170E/F187X). E. coli/pveh3G170E/F187L had the highest EH activity of 19.64 U/g wet cell, while /pveh3G170E/F187I the highest αS of 94.5%. The enantioconvergent hydrolysis of 150 mM rac-pCSO by E. coli/pveh3G170E/F187I produced (R)-p-chlorophenyl-1,2-ethanediol with 92.8% eep and 8.68 mmol/h/L space-time yield. The mechanism of PvEH3G170E/F187I with improved enantioconvergency was analyzed by molecular docking simulation.Graphical abstractUnlabelled Image
       
  • Heterogeneous Fenton catalysts prepared from modified-fly ash for NOx
           removal with H2O2
    • Abstract: Publication date: Available online 20 August 2018Source: Catalysis CommunicationsAuthor(s): Rongji Cui, Bingchuan Yang, Shicheng Li, Jie Wang, Suxia MaHeterogeneous Fenton catalysts were developed from fly ash by alkali, acid and alkali-acid modification for NOx removal using H2O2.The experimental results showed that the catalyst derived from alkali-acid modification achieved 90% NOx removal efficiency at 140 °C, 0.07 mg/min of H2O2 mass flow rate (2 mol/L H2O2)and 250 mL/min of simulated flue gas stream containing 500 ppm NO. Catalyst characterization revealed that the hematite used contained surface hydroxyl groups, Fe2+, oxygen vacancies and FeOAl, which were considered beneficial to the generation of hydroxyl radicals. This work illustrates potential practical use of fly ash.Graphical abstractUnlabelled Image
       
  • The interplay of Au nanoparticles and ZnO nanorods for oxygen-promoted,
           base-free, complete formaldehyde reforming into H2 and CO2
    • Abstract: Publication date: Available online 20 August 2018Source: Catalysis CommunicationsAuthor(s): Xiaoqing Yan, Xingxing Duan, Xin Zhou, Shuang Chen, Shipan Liang, Ziwei Guo, Leilei Du, Kaicheng Qian, Xiaohui Zhu, Renhong LiAu nanoparticles on ZnO nanorods is a sustainable catalyst for oxygen-promoted, base-free, complete formaldehyde reforming into H2 and CO2 at low temperatures. The strong metal-support interaction (SMSI) between Au and ZnO is suggested to be responsible for this catalytic feature partially due to the presence of surface cationic Au+ species formed during high temperature treatment in air. in-situ EPR and resonance Raman analysis show that a two-electron reduction pathway is involved to produce hydrogen peroxide as the active species and CH bond cleavage is the rate-determining step.Graphical abstractUnlabelled Image
       
  • Carbon dioxide reforming of methane over cobalt catalysts supported on
           hydrotalcite and metal oxides
    • Abstract: Publication date: Available online 18 August 2018Source: Catalysis CommunicationsAuthor(s): Yu Guo, Junying Lu, Qirui Liu, Xiaoli Bai, Lijun Gao, Weixia Tu, Zhou-jun WangCobalt (Co) catalysts supported on hydrotalcite (MgAl) and metal oxides (MgO, Al2O3) have been synthesized by co-precipitation methods for CO2 reforming of methane. It is found that the Co/MgAl catalyst possessed excellent initial activity and outstanding long-term stability. An activation process was observed on the Co/MgO catalyst, which was followed by moderate deactivation. The Co/Al2O3 catalyst suffered severe deactivation although it exhibited relatively good initial activity. The structural characterizations demonstrate that the exceptional reforming performance of the Co/MgAl catalyst was related to high specific surface area, abundant medium basic sites, tiny Co nanoparticles and strong metal-support interactions.Graphical abstractUnlabelled Image
       
  • The role of the KCaF3 crystalline phase on the activity of KF/CaO
           biodiesel synthesis catalyst
    • Abstract: Publication date: Available online 18 August 2018Source: Catalysis CommunicationsAuthor(s): Xiaozhou Ye, Wei Wang, Xiaoli Zhao, Tao Wen, Yongjun Li, Zhonghua Ma, Libai Wen, Jianfeng Ye, Yun WangKF-loaded CaO is known as a good solid base catalyst for biodiesel synthesis. KCaF3 is generated when the KF/CaO catalyst is prepared, but its role in biodiesel synthesis is uncertain. Herein, we systematically investigated how KCaF3 affected the transesterification reaction to yield biodiesel. We found that KCaF3, by itself or as a component in KF/CaO, had no catalytic activity in biodiesel synthesis. Its real role was to improve the mechanical strength and structural robustness of the catalyst, thereby enhancing the catalytic activity of KF/CaO in transesterification reaction.Graphical abstractUnlabelled Image
       
  • Al+composite+oxide-supported+potassium+catalysts+for+biodiesel+production&rft.title=Catalysis+Communications&rft.issn=1566-7367&rft.date=&rft.volume=">Synthesis of ordered mesoporous MgAl composite oxide-supported potassium
           catalysts for biodiesel production
    • Abstract: Publication date: Available online 16 August 2018Source: Catalysis CommunicationsAuthor(s): Dahai Pan, Tonglian Liu, Feng Yu, Shuwei Chen, Xiaoliang Yan, Xiufeng Shi, Binbin Fan, Ruifeng LiOrdered mesoporous MgAl composite oxide-supported K catalysts (xK/OMMA) were prepared and used for soybean oil transesterification with methanol. The prepared xK/OMMA demonstrated a much higher soybean oil conversion (up to 97.0%) along with a 99.8% selectivity to fatty acid methyl ester and a desirable reusability, compared with K-based catalysts prepared with the same K loading and using ordered mesoporous alumina or mesoporous MgAl mixed oxide as support. The superior catalytic performance of xK/OMMA is associated with the excellent structural and surface properties of support OMMA, thus benefiting the generation of catalytically active sites and their highly homogenous dispersion.Graphical abstractUnlabelled Image
       
  • Enhanced photocatalytic activity of TiO2 by micrometer-scale flower-like
           morphology for gaseous elemental mercury removal
    • Abstract: Publication date: Available online 14 August 2018Source: Catalysis CommunicationsAuthor(s): Yang Ling, Chong Zhang, Jiang Wu, Weixing Xu, Yongfeng Qi, Ping He, Lili Zhao, Yu Guan, Zhen Zhang, Yuzhuo TianA flower-like TiO2 photocatlyst has been fabricated using hydrothermal method with the changing of sodium hydroxide volume to control the morphology so as to enhance the photocataltic activity. The as-prepared photocatalysts has entire anatase phase with numerous nanowires covered on its surface, which structure is conducive to the higher BET surface area (86.7910 m2/g) and lower recombination between holes and photoelectrons. The photocatalytic ability was tested by oxidation of gaseous Hg0 in a lab-scale reactor, and TiO2-5 is found to be the best efficiency and 80 °C is the optimum photocatalytic reaction temperature. The photocatalytic oxidation mechanism has also been proposed.Graphical abstractUnlabelled Image
       
  • Ba doped on CeO2-δ supported MnOx catalyst for selective oxidation of
           alcohol to aldehyde
    • Abstract: Publication date: Available online 14 August 2018Source: Catalysis CommunicationsAuthor(s): R.K. More, N.R. Lavande, P.M. MoreThe series of barium doped MnOx/CeO2-δ catalysts were prepared and investigated for oxidation of benzyl alcohol to benzaldehyde using TBHP without solvent. The catalysts were characterized by using XRD, ICP-AES, CO2-TPD, XPS, and TEM. The characterizations showed that the interaction of well dispersed Ba nano rod (barium oxide-peroxide) with Mn and Ce could be responsible for the formation of lower particle size with maximum adsorbed oxygen species. The ATR-FTIR result demonstrated the formation of benzyl, alkoxy and peroxy intermediate on the catalyst surface. These species could be responsible for the increase in selectivity to benzaldehyde compared to the Mn0.5/Ce0.5 catalyst.Graphical abstractUnlabelled Image
       
  • Enhanced catalytic performance of Zr-modified ZSM-5-supported Zn for the
           hydration of acetylene to acetaldehyde
    • Abstract: Publication date: Available online 14 August 2018Source: Catalysis CommunicationsAuthor(s): Qinqin Wang, Mingyuan Zhu, Haiyang Zhang, Caixia Xu, Bin Dai, Jinli ZhangZr-modified ZSM-5 zeolite was successfully prepared, and Zn/Zr-ZSM-5 was employed as a catalyst for the acetylene hydration reaction. High catalytic activity, above 96% C2H2 conversion, was achieved at 260 °C with a feed reactant ratio of H2O/C2H4 = 4 and a GHSV of 90 h−1. To understand the influence of zirconium addition in the zeolite, Fourier-transform infrared spectroscopy, X-ray diffraction, surface texture analysis (BET method), transmission electron microscopy, temperature programmed desorption of NH3, temperature programmed reduction by hydrogen and X-ray photoelectron spectroscopy techniques were used. The incorporation of zirconium in the zeolite enhanced Zn metal dispersion and metal–support interactions. Moreover, an enhanced concentration of weak acid sites and active catalytic sites were found to be responsible for the high catalytic activity of Zn/Zr-ZSM-5 for the acetylene hydration.Graphical abstractUnlabelled Image
       
  • Catalytic oxidation of benzene to phenol with hydrogen peroxide over
           Fe-terpyridine complexes supported on a cation exchange resin
    • Abstract: Publication date: Available online 13 August 2018Source: Catalysis CommunicationsAuthor(s): Syuhei Yamaguchi, Kohei Miyamoto, Hidenori YahiroThe catalytic activity of [Fe(terpy)2]2+ complexes supported on the cation exchange resins, ([Fe(terpy)2]2+@resin), was investigated for the oxidation of benzene with H2O2 to yield phenol. The catalytic activity of an [Fe(terpy)2]2+@Nafion catalyst for the oxidation of benzene with H2O2 was observed to be five times more than that in case of the [Fe(terpy)2]2+@resin catalysts. Among the [Fe(terpy)2]2+@resin catalysts that were investigated in this study, the [Fe(terpy)2]2+@Nafion catalyst exhibits the highest durability against H2O2 because the other resins were dissolved or dispersed in the reaction solvent. Nafion was found to be the best candidate among the polymer supports for loading the Fe complex active to perform the oxidation of a substrate with H2O2.Graphic abstractUnlabelled Image
       
  • In situ regeneration of commercial NH3-SCR catalysts with
           high-temperature water vapor
    • Abstract: Publication date: Available online 13 August 2018Source: Catalysis CommunicationsAuthor(s): Yao Shi, Pei Zhang, Tuotuo Fang, Erhao Gao, Fujuan Xi, Tianyu Shou, Mengna Tao, Siming Wu, Matthew T. Bernards, Yi He, Hua PanThe performance of a commercial NH3-SCR catalyst used for 20,000 h in a 660 MW coal fired power plant was evaluated after treated in situ with water vapor at 300–350 °C for 336 h. The conversion of NOx reached 91.4% after this water treatment. The recovery of catalytic activity is mainly due to the removal of potassium, arsenic and sulfate-containing deposits from the catalyst surface, as well as the increase of surface active oxygen species and specific surface area. These results indicate that commercial NH3-SCR catalysts are deactivated by the deposition of water-soluble substances and which can be in situ regenerated cost-effectively with high-temperature water vapor treatment.Graphical abstractUnlabelled Image
       
  • Influence of the bite natural angle of bidentate diphosphine ligands in
           the syngas-free branched hydroformylation of β-functionalized olefins
    • Abstract: Publication date: Available online 12 August 2018Source: Catalysis CommunicationsAuthor(s): Marcelo Vilches-Herrera, Matias Concha-Puelles, Nicole Carvajal, Juana Molina, Rocio Santander, Marcos Caroli Rezende, Susan LührThe correlation between the activity, regio- and chemoselectivity of Rh-diphosphine catalyst and the ligand bite natural angle (βn) in the syngas-free hydroformylation of allyl cyanide was investigated. A screening of Xantphos type and diphosphine alkyl ligands with different bite natural angles was studied. Interesting, a switch in the linear to the branch regioselectivity was found. Wide βn favour a linear regioselectivity whereas smaller βn allow the formation of the branched aldehyde as the major product. Modification of the substituents at the phosphorous atoms of the diphosphine ligands produced a dramatic change in the hydroformylation. Others β-functionalized olefins were also branched hydroformylated.Graphical abstractUnlabelled Image
       
  • Activity and selectivity of carbon supported palladium catalysts prepared
           from bis(η3-allyl)palladium complexes in phenylacetylene hydrogenation
    • Abstract: Publication date: Available online 12 August 2018Source: Catalysis CommunicationsAuthor(s): H.A. Al-Wadhaf, V.M. Karpov, E.A. KatsmanLiquid phase hydrogenation of phenylacetylene was investigated on a series of 9.1 wt% Pd/C catalysts prepared from bis(η3-allyl)palladium complexes, as well as commercial Russian Pd/C catalyst (GIPKH-108). Pd/C catalysts were characterized by oxygen absorption and SEM. All prepared Pd/C catalysts demonstrated very high selectivity to styrene. The reduction temperature of palladium precursor has a significant effect on the palladium dispersity, but the substituent near terminal carbon atom of allyl ligand affects the dispersity more essentially than reduction temperature. Pd/C catalyst prepared from bis[(η3-allyl)palladium acetate] showed highest metal dispersity, activity and selectivity in the hydrogenation of phenylacetylene to styrene.Graphical abstractUnlabelled Image
       
  • MnO x -CeO2 catalysts for effective NO x reduction in the presence of
           chlorobenzene
    • Abstract: Publication date: Available online 12 August 2018Source: Catalysis CommunicationsAuthor(s): Lina Gan, Kezhi Li, Shangchao Xiong, Yani Zhang, Jianjun Chen, Yue Peng, Junhua LiThe catalytic performance of MnOx-CeO2 for the simultaneous NOx reduction and chlorobenzene (CB) oxidation was investigated. The MnOx(0.4)-CeO2 solid composition exhibited excellent catalytic activity due to the formation of MnyCe1-yO2-δ solid solution and the good balance between redox properties and surface acidity compared to pure ceria. The presence of CB improved both the NOx conversion and N2 selectivity in the range of 200–300 °C. Furthermore, the activity temperature window for NOx reduction was broadened when CB was introduced into the flue gas, and the CB oxidation ability was also enhanced in the presence of O2 and NH3/NO.Graphical abstractUnlabelled Image
       
  • Effect of high pressure and magnetic field treatments on stability of
           Candida antarctica lipase B (CALB) and lysozyme from chicken egg
    • Abstract: Publication date: Available online 9 August 2018Source: Catalysis CommunicationsAuthor(s): Lídia Tiggemann Prando, Marina de Souza Melchiors, Talyta Mayara Silva Torres, Vanessa Almeida de Oliveira, Josamaique Gilson Veneral, Marcos Antonio Castiani, Débora de Oliveira, J. Vladimir de Oliveira, Marco Di LuccioThe aim of this study was to treat enzymes with high pressure or magnetic field, and to evaluate their storage stability after treatment. The application of a magnetic field of 1.34 T increased the lysozyme activity about 55%, while a treatment with 0.7 T increased 80% the Candida antarctica lipase B (CALB) activity. After the magnetic treatment, the residual activity was maintained above 140% for lysozyme and CALB at 4 °C, showing good stability after treatment. Furthermore, lysozyme treated with supercritical CO2 had lower decrease on activity during storage, compared to others gases, maintaining residual activity over 100%.Graphical abstractUnlabelled Image
       
  • Thermally induced reconstruction of ceria nanocubes into zigzag
           {111}-nanofacetted structures and its influence on catalytic activity in
           CO oxidation
    • Abstract: Publication date: Available online 9 August 2018Source: Catalysis CommunicationsAuthor(s): O.S. Bezkrovnyi, P. Kraszkiewicz, M. Ptak, L. KepinskiThermally induced reconstruction of ceria nanocubes into {111}-nanofacetted structures was investigated by XRD, TEM and Raman spectroscopy. The beneficial role of reducing atmosphere on the surface reconstruction processes was observed and is discussed. The activity of ceria nanoparticles with various surface morphology in catalytic oxidation of CO was investigated. The order of catalytic activity of the particles: smooth ceria nanocubes > {111}-nanofacetted ceria nanocubes > smooth octahedra correlates with the concentration of Ce3+ - oxygen vacancy pairs determined by Raman spectroscopy.Graphical abstractUnlabelled Image
       
  • Iridium catalysed highly efficient transfer hydrogenation reduction of
           aldehydes and ketones in water
    • Abstract: Publication date: Available online 9 August 2018Source: Catalysis CommunicationsAuthor(s): Zhiheng Yang, Weiyan Cheng, Zeyun LiWe provide a new transfer hydrogenation of structurally diverse aldehydes and ketones in water using formic acid as hydride donor. The iridium complex of 4,4′,5,5′-tetrahydro-1H,1′H-2,2′-biimidazole, is used as the efficient catalyst. The S/C ratios in aldehyde and ketone reductions are as low as 20,000 and 10,000, respectively. The TOF value in aldehyde reduction is as high as 60,000 h−1. A number of functional groups such as (hetero)aryl, alkenyl, halogen, phenolic and alcoholic hydroxyls, trifluromethyl, cyano, nitro, ester, carboxylic acid, and acidic methylenes are well tolerated.Graphical abstractUnlabelled Image
       
  • Effect of preparation route on Sr2TiO4 catalyst for the oxidative coupling
           of methane
    • Abstract: Publication date: Available online 8 August 2018Source: Catalysis CommunicationsAuthor(s): Y.A. Ivanova, E.F. Sutormina, N.A. Rudina, A.V. Nartova, L.A. IsupovaFour different preparation routes were used to synthesize Sr2TiO4 with the structure of layered perovskite: sol-precipitation (SP), co-precipitation (CO), citrate precursor (CT) and mechanochemical (MA) methods with further calcinations at 1100 °C. The XDR, XPS, BET, SEM techniques showed that the different preparation routes caused the formation of layered perovskite phase with different admixture phases, particle sizes and the surface enrichment with layered perovskite (for SP and MA samples) or strontium oxide (for CO and CT samples). The trend of increasing of CH4 conversion and C2-yield in oxidative coupling of methane at 800-900 °C was found to be the following: SP≈MA > CO > CT samples. The C2-yield of the most active catalysts was measured to be about 12%.Graphical abstractUnlabelled Image
       
  • CCO+system&rft.title=Catalysis+Communications&rft.issn=1566-7367&rft.date=&rft.volume=">Self-supported gold/chitosan nanocatalyst for chemoselective hydrogenation
           in π-conjugated CCCO system
    • Abstract: Publication date: Available online 4 August 2018Source: Catalysis CommunicationsAuthor(s): Anike H. Virgili, Leandro Luza, Jesum A. Fernandes, Tania M.H. Costa, Eliana W. de Menezes, Edilson V. BenvenuttiA self-supported gold/chitosan nanocatalyst was easily obtained by drying a water dispersion followed by powdering it. In this system chitosan acts concomitantly as a stabilizer and support for gold nanoparticles. The self-supported gold/chitosan was applied as catalyst for CC and CO hydrogenation in conjugate and non-conjugate systems. The catalyst showed activity, driving selectivity to saturated alcohols or saturated ketones (selectivities ≥99%) depending on the reducing agent used, NaBH4 or H2 respectively. When H2 was used, the catalyst showed activity only in conjugate CCCO, forming saturated aldehydes and ketones. For isolated CC, CO or conjugate CCCC bonds, no activity was observed.Graphical abstractUnlabelled Image
       
  • A green methodology for the selective catalytic oxidation of styrene by
           magnetic metal-transition ferrite nanoparticles
    • Abstract: Publication date: Available online 2 August 2018Source: Catalysis CommunicationsAuthor(s): Nuno M.R. Martins, Armando J.L. Pombeiro, Luísa M.D.R.S. MartinsA microwave-assisted protocol to selectively produce benzaldehyde from neat styrene was developed by using ferrite magnetic nanoparticles, MFe2O4 [M = Mn2+, Fe2+, Co2+, Ni2+, Cu2+ or Zn2+] as catalysts. The CoFe2O4 nanoparticles revealed the best catalytic performance towards the selective production of benzaldehyde (93% selectivity at 86% styrene conversion) in 3 h at 80 °C using t-BuOOH as oxidant. The catalyst can be readily isolated by using an external magnet, and no significant loss of activity is observed when reused up to 5 consecutive runs. The low E-factor (mass ratio of waste to desired product) value (2.5) is indicative of the eco-friendly nature of the present catalytic system.Graphical abstractUnlabelled Image
       
  • Preparation of Au/TiO2 by a facile method at room temperature for the CO
           preferential oxidation reaction
    • Abstract: Publication date: Available online 2 August 2018Source: Catalysis CommunicationsAuthor(s): Georgia Barbalho Leal, Ligia Ciotti, Beatriz Naomy Watacabe, Daniela C. Loureiro da Silva, Rodolfo M. Antoniassi, Júlio César M. Silva, Marcelo Linardi, Reinaldo Giudici, Jorge Moreira Vaz, Estevam V. SpinacéA simple strategy was used to prepare Au/TiO2 catalyst at room temperature. Au nanoparticles were initially prepared in solution using HAuCl4.3H2O as Au precursor, sodium citrate as stabilizing agent and sodium borohydride as reducing agent. The preformed Au nanoparticles were further supported on TiO2 and the resulting solid material was characterized by Energy-dispersive X-ray spectroscopy, X-ray diffraction and Transmission Electron Microscopy and tested for the preferential oxidation of carbon monoxide in hydrogen-rich stream (CO-PROX reaction). The obtained Au/TiO2 catalyst consisted of Au nanoparticles with an average size of ~ 4 nm and showed excellent catalytic performance in the 20-50 °C low-temperature range. In particular, at 40 °C a CO conversion of 99.5% and CO2 selectivity of 45% were obtained using an O2/CO ratio of 2 (1 vol% CO, λ = 4) and 97 vol% H2 in the feed gas stream (GHSV = 15,000 ml gcat−1 h−1).Graphical abstractUnlabelled Image
       
  • Manganese oxide catalyzed synthesis of anti-HIV N-substituted
           benzimidazoles via a one-pot multistep process
    • Abstract: Publication date: Available online 1 August 2018Source: Catalysis CommunicationsAuthor(s): Xiuru Bi, Xu Meng, Gexin Chen, Baohua Chen, Peiqing Zhao1, 2-Disubstituted benzimidazoles are drug discovery targets and play an important role in many areas. Herein, non-noble-metal α-MnO2 prepared using urea as the additive was found to be an efficient catalyst for the synthesis of antiviral 1,2-disubstituted benzimidazoles via one-pot multistep reactions using dimethyl carbonate and air as green solvent and oxidant, respectively. The catalytic system could tolerate 1, 2-diol or alcohols as raw via cascade oxidation/cyclization/alkylation to realize the desired products in moderate to good yields. The catalyst was characterized by ICP-AES, XRD, BET, SEM, TEM and XPS, which indicates that the surface oxygen species seriously affected the catalytic performance. And the leaching of Na/K ions in tunnels of the catalyst caused loss of catalytic activity of retrieved α-MnO2.Graphical abstractUnlabelled Image
       
  • Bi2Te3 sheet contributing to the formation of flower-like BiOCl composite
           and its N2 photofixation ability enhancement
    • Abstract: Publication date: Available online 31 July 2018Source: Catalysis CommunicationsAuthor(s): Xinshan Rong, Yanhua Mao, Jicheng Xu, Xiaoying Zhang, Lu Zhang, Xiangtong Zhou, Fengxian Qiu, Zhiren WuThe N2 photofixation has been considered as a green and eco-friendly ammonia synthesis approach. In this work, Bi2Te3 was employed to modify BiOCl for the formation of a highly active composited micro flower-like structure photocatalyst. Efficient ammonia evolution rate reached 315.9 μmol/L·h over Bi2Te3/BiOCl under UV light irradiation. Based on the analysis of bandgap and reduction potential of two components, the electrons generated from BiOCl is attributed to the N2 photofixation, while the photogenerated charges from the excitation of Bi2Te3 suppress the recombination of photogenerated hole-electron of BiOCl effectively.Graphical abstractA flower-like Bi2Te3/BiOCl composited photocatalyst contributed to the N2 photofixation ability enhancement.Unlabelled Image
       
  • Highly active and stable spinel-oxide supported gold catalyst for
           gas-phase selective aerobic oxidation of cyclohexanol to cyclohexanone
    • Abstract: Publication date: Available online 31 July 2018Source: Catalysis CommunicationsAuthor(s): Yanan Gao, Emiel J.M. HensenHighly dispersed gold nanoparticles supported on Cu-doped spinel oxides were prepared by a simple deposition-precipitation method. The results indicate that Au/MgCuCr2O4 catalyst is very efficient for gas-phase oxidation of cyclohexanol to cyclohexanone, giving 69.5% and 86.4% yield of cyclohexanone at 260 °C and 300 °C, respectively. Deactivation was not observed in a 100 h stability test. This excellent performance can be correlated with the highly stable gold nanoparticles in the reaction deriving from the strong gold-support interaction and efficient AuCu synergy.Graphical abstractUnlabelled Image
       
  • Synthesis and initial thermal behavior investigation of 2-alkenyl
           substituted pyrazine N-oxides
    • Abstract: Publication date: Available online 30 July 2018Source: Catalysis CommunicationsAuthor(s): Ke Zhai, Miao Lai, Zhiyong Wu, Mingqin Zhao, Yanqiu Jing, Pengfei LiuThe systematic syntheses of 2-alkenylpyrazine N-oxides through palladium-catalyzed C-2 selective CH olefination reaction was disclosed. Various acrylate esters substituted pyrazine N-oxides were obtained in up to 93% yields. Thermogravimetric analysis indicated that the fracture temperature of particular compound 3 f was about 267 °C. The pyrolysis of compound 3 f could generate several aroma compounds such as 2,5-dimethylpyrazine, 2,3,5-trimethylpyrazine and benzyl alcohol. The results of the pyrolysis experiment perfectly proved the flavoring property of the products as potential flavor additives.Graphical abstractUnlabelled Image
       
  • Conversion of levulinic acid to N-substituted pyrrolidinones over a
           nonnoble bimetallic catalyst Cu15Pr3/Al2O3
    • Abstract: Publication date: Available online 25 July 2018Source: Catalysis CommunicationsAuthor(s): Pengwei Cao, Tengfei Ma, Hong-Yu Zhang, Guohui Yin, Jiquan Zhao, Yuecheng ZhangA nonnoble bimetallic metal catalyst Cu15Pr3/Al2O3 readily prepared through incipient-wetness impregnation method was developed for the reductive amination of levulinic acid (LA) with amines to N-substituted-5-methyl-2-pyrrolidinones. A wide variety of N-substituted-5-methyl-2-pyrrolidinones were obtained in high yield over this catalyst. The characterization results from XRD, H2-TPR, XPS, TEM, NH3-TPD and N2 adsorption-desorption revealed that Cu0 species are the active species for the hydrogenation in the reductive amination reaction. Besides, the doping of praseodymium into γ-Al2O3 supported copper catalyst greatly enhanced the catalytic performance of Cu/γ-Al2O3 due to better dispersion of Cu0.Graphical abstractUnlabelled Image
       
  • Synthesis and continuous catalytic application of alkaline protease
           nanoflowers–PVA composite hydrogel
    • Abstract: Publication date: Available online 23 July 2018Source: Catalysis CommunicationsAuthor(s): Haiyang Zhang, Xu Fei, Jing Tian, Yao Li, Hui Zhi, Kang Wang, Longquan Xu, Yi WangThis paper reports a facile approach for the synthesis of alkaline protease nanoflowers–poly(vinyl alcohol) (PVA) composite hydrogel (NPCH) from alkaline protease–Cu3(PO4)2·3H2O nanoflowers and PVA hydrogel through freezing–thawing. During continuous catalytic application, the PVA hydrogel network protected alkaline protease–Cu3(PO4)2·3H2O nanoflowers from damage and helped maintain enzymatic activity at high levels. The enzyme that had been immobilized in nanoflowers and NPCH demonstrated 1027% and 605% higher activity than the free alkaline protease derived from Bacillus licheniformis. When used in cyclic catalysis, NPCH exhibited better reusability than nanoflowers and was easily separated from the product.Graphical abstractUnlabelled Image
       
  • A green and facile synthesis of Co3O4 monolithic catalyst with enhanced
           total oxidation of propane performance
    • Abstract: Publication date: Available online 17 July 2018Source: Catalysis CommunicationsAuthor(s): Bei Xiao, Kunfeng Zhao, Lin Zhang, Ting Cai, Xiaolan Zhang, Zexuan Wang, Jing Yuan, Ling Yang, Peng Gao, Dannong HeAbstractA nanoflower-like nickel foam supported Co3O4 (Co-NF) monolithic catalyst was synthesized via a green and facile electro-deposition strategy. The optimized Co-NF presents much higher catalytic activity per Co3O4 loading, ca. 6.7 × 10−4 mol/(gCo3O4·s) at 220 °C and exhibits a lower activation energy of 46 kJ/mol compared with powder Co3O4. It also exhibited good stability (e.g.>80% propane conversion) for 40 h at 350 °C and a GHSV of 30,000 mL/(gcat·h) without any notable decrease. The 3D hierarchical microstructures with interconnected pore channels, the high Co2+ content and the weak CoO bond strength of Co-NF-300 s were considered key factors responsible for the good activity and stability in the propane catalytic total oxidation.Graphical AbstractUnlabelled Image
       
  • Catalytic conversion of hemicellulosic sugars derived from biomass to
           levulinic acid
    • Abstract: Publication date: Available online 20 April 2018Source: Catalysis CommunicationsAuthor(s): Hanseob Jeong, Se-Yeong Park, Ga-Hee Ryu, June-Ho Choi, Jong-Hwa Kim, Won-Sil Choi, Soo Min Lee, Joon Weon Choi, In-Gyu ChoiAbstractCatalytic conversion of hemicellulosic sugars from biomass towards levulinic acid production was conducted using modified-zeolite Y (commercial). The zeolite was treated by NaOH of different concentration (x M) before used for the conversion of C5 sugars to levulinic acid. The modified zeolites had a larger porosity and an increased concentration of stronger acid sites compared to the untreated zeolite. Levulinic acid yield of 4.6% (conversion of C5 sugar to levulinic acid: 42.7%) was maximized at 190 °C and reaction time of 180 min (batch reactor), when using the zeolite treated with 0.25 M NaOH. In addition, with the absence of C6 sugar, the conversion of C5 sugar was higher than that of C5-C6 sugar mixture. The present work provides a new heterogeneous catalytic approach for levulinic acid production from liquid hydrolysates (by-product of biomass utilization).
       
  • Preparation of CuZnAl hydrotalcite-like catalysts for AsH3
           abatement at low temperatures
    • Abstract: Publication date: Available online 27 March 2018Source: Catalysis CommunicationsAuthor(s): Yilong Lin, Xueqian Wang, Jiming Hao, Ping Ning, Guangfei Qu, Lihong Tang, Yibing Xie, Caidong Du, Yanhua HeIn this study, a series of CuZnAl hydrotalcite-like compound (HTLC) precursors were prepared by a hydrothermal method under varying synthesis conditions. The HTLCs and their respective metal oxides formed after calcination were characterized by XRD, SEM-EDS, TGA and N2-BET with the aim to determine the effect of the preparation conditions on their catalytic performance towards AsH3 oxidation and adsorption. The optimal parameters determined were Cu:Zn of 10:3, hydrothermal temperature of 105 °C and calcination temperature of 500 °C. Finally, these optimal conditions led to a CuZnAl material with excellent AsH3 removal efficiencies for 10 h at 60 °C.Graphical abstractUnlabelled Image
       
 
 
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