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  Subjects -> ENGINEERING (Total: 2270 journals)
    - CHEMICAL ENGINEERING (191 journals)
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ENGINEERING (1199 journals)                  1 2 3 4 5 6 | Last

Showing 1 - 200 of 1205 Journals sorted alphabetically
3 Biotech     Open Access   (Followers: 7)
3D Research     Hybrid Journal   (Followers: 19)
AAPG Bulletin     Full-text available via subscription   (Followers: 5)
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Analele Universitatii Ovidius Constanta - Seria Chimie     Open Access  
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at - Automatisierungstechnik     Hybrid Journal   (Followers: 1)
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Balkan Region Conference on Engineering and Business Education     Open Access   (Followers: 1)
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Calphad     Hybrid Journal  
Canadian Geotechnical Journal     Full-text available via subscription   (Followers: 13)
Canadian Journal of Remote Sensing     Full-text available via subscription   (Followers: 40)
Case Studies in Engineering Failure Analysis     Open Access   (Followers: 7)
Case Studies in Thermal Engineering     Open Access   (Followers: 3)
Catalysis Communications     Hybrid Journal   (Followers: 6)
Catalysis Letters     Hybrid Journal   (Followers: 2)
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Catalysis Today     Hybrid Journal   (Followers: 5)
CEAS Space Journal     Hybrid Journal  
Cellular and Molecular Neurobiology     Hybrid Journal   (Followers: 3)
Central European Journal of Engineering     Hybrid Journal   (Followers: 1)
CFD Letters     Open Access   (Followers: 6)
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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CIRP Annals - Manufacturing Technology     Full-text available via subscription   (Followers: 11)
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        1 2 3 4 5 6 | Last

Journal Cover Catalysis Communications
  [SJR: 1.029]   [H-I: 84]   [6 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1566-7367
   Published by Elsevier Homepage  [3031 journals]
  • Facile synthesis of supported copper manganese oxides catalysts for low
           temperature CO oxidation in confined spaces
    • Abstract: Publication date: August 2017
      Source:Catalysis Communications, Volume 99
      Author(s): Yafei Guo, Chuanwen Zhao, Jin Lin, Changhai Li, Shouxiang Lu
      In this work, several MxOy-supported CuO-MnO2 (MxOy =Al2O3, CeO2, TiO2 and Y2O3) composite catalysts were synthesized by the co-impregnation method using copper and manganese acetates as precursors. The catalysts were characterized by N2 adsorption-desorption at 77K, XRD, FESEM, FT-IR and XPS techniques. Low-temperature CO oxidation performances of the catalysts were evaluated using a fixed-bed reactor system. Amongst the prepared catalysts, CuO-MnO2/CeO2 exhibited excellent CO oxidation activity, good working stability after about 1h of reaction tested and superior kinetics performances. The dual synergistic effects in CuO-MnO2 and CuO-CeO2 are associated with the enhanced CO oxidation process observed over CuO-MnO2/CeO2. The catalyst shows promise for removing CO from typical confined spaces such as onboard naval submarines, space-crafts and mine refuge chambers.
      Graphical abstract image

      PubDate: 2017-05-22T07:58:51Z
       
  • Room temperature selective oxidation of benzyl alcohol under base-free
           aqueous conditions on Pt/TiO2
    • Abstract: Publication date: August 2017
      Source:Catalysis Communications, Volume 99
      Author(s): Juanjuan Liu, Shihui Zou, Linfang Lu, Hongting Zhao, Liping Xiao, Jie Fan
      Pt nanoparticles supported on anatase TiO2 is an efficient and stable catalyst for room-temperature selective oxidation of benzyl alcohol under base-free aqueous conditions with ambient air as the oxidant. The result shows that the anatase content of support has a big influence on the activity of Pt/TiO2. Higher anatase content results in better performance, with optimal activity for Pt/anatase TiO2 of 76.7±1.5% in conversion and nearly 100% in selectivity to aldehyde within 10h. Moreover, a quasi-linear relationship between anatase content of the support and the activity of Pt/TiO2 is observed.
      Graphical abstract image

      PubDate: 2017-05-22T07:58:51Z
       
  • Single step pyrolytic conversion of zeolitic imidazolate to CoO
           encapsulated N-doped carbon nanotubes as an efficient oxygen reduction
           electrocatalyst
    • Abstract: Publication date: August 2017
      Source:Catalysis Communications, Volume 99
      Author(s): Inayat Ali Khan, Amin Badshah, Muhammad Arif Nadeem
      Efficient and noble metal-free electrocatalyst could enhance conceivably fuel cell's affordable commercialization. In this esteem, we developed CoO embedded N-doped CNTs from zeolitic imidazolate framework (ZIF-12) by single step inert atmosphere calcination, to be used as oxygen reduction reaction (ORR) electrocatalyst. In the electrochemical studies performed, the CoO/N-CNTs has demonstrated an onset potential of 0.83V vs. RHE, very close to the commercial Pt catalyst value, electron transfer number of 3.5 which approaches the theoretical value of 4 and current density of 3.35mAcm−2 at 2500rmp. The excellent activity of the electrocatalyst is to be attributed to its waved-tubular structure casing CoO particles and to its high surface area as it was proved by TEM and gas adsorption analysis.
      Graphical abstract image

      PubDate: 2017-05-22T07:58:51Z
       
  • Spatial confinement effects of zeolite-based micro-capsule catalyst on
           tuned Fischer-Tropsch synthesis product distribution
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Wenze Li, Yingluo He, Hangjie Li, Dongming Shen, Chuang Xing, Ruiqin Yang
      Selectivity control of target product(s) is an enormous challenging in cascade catalytic or tandem system. We demonstrated a facile and fast route to directly construct zeolite-based micro-capsule catalyst with mesoporous nano-silica shell. The as-prepared out-Co/HY@SiO2 catalyst has achieved an excellent performance of CH4 and C5–11 selectivity with 16.4 and 65.0% respectively, as well as low CO2 selectivity of 2.1%. As expected, the mesoporous shell of micro-capsule catalyst could offer the spatial confinement effects, especial the stay zone of intermedium products for long chain hydrocarbons formation, which were hydrocracked by acidic HY core, consequently tuning the products selectivity.
      Graphical abstract image

      PubDate: 2017-05-22T07:58:51Z
       
  • Hydrotreatment of jatropha oil over NiMoS catalyst supported on
           thermostable mesoporous silica doped titania for the production of
           renewable drop-in diesel
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Rohit Kumar, Saleem Akthar Farooqui, Mohit Anand, Rakesh Kumar, Rakesh Joshi, Azeem Khan, Anil Kumar Sinha
      Hydrotreatment of jatropha oil over sulphided NiMoS catalyst supported on structurally thermostable mesoporous anatase TiO2 doped with isolated silica sites was carried out under typical hydroprocessing conditions. The developed catalyst selectively produce diesel (91–97% of total product) with complete conversion of triglyceride molecules to hydrocarbons. The results of this study were compared with those obtained for hydrotreatment of jatropha oil over conventional catalyst (Ni-Mo/Al2O3 and Ni-Mo/SiO2-Al2O3). It was found that the performance of NiMoS/titania catalyst for renewable diesel production was better than conventional catalyst and by tuning the reaction conditions; a good yield of diesel range hydrocarbons could be achieved.
      Graphical abstract image

      PubDate: 2017-05-22T07:58:51Z
       
  • Solvent-free selective oxidation of toluene with O2 catalysed by anion
           modified mesoporous mixed oxides with high thermal stability
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Xiaoli Wang, Gongde Wu, Fang Wang, Hao Liu, Tongfa Jin
      A series of anion intercalated transition metal hydroxides and their calcined mixed metal oxides were prepared for the solvent-free selective oxidation of toluene with O2. The results revealed that the anion modified mixed metal oxides showed much better catalytic performance than their parent hydroxides. Moreover, the anions were also found to play important role in the catalytic performance and thermal stabilities of modified catalysts. Unexpectedly, iodide ion exhibited high thermal stability in the mesoporous structures of mixed metal oxides even at high temperatures of 1073K. Under the optimal reaction conditions, the highest toluene conversion reached 15.5% with 100% of the selectivity to benzaldehyde.
      Graphical abstract image

      PubDate: 2017-05-22T07:58:51Z
       
  • Bismuth sulphide-modified molybdenum disulphide as an efficient
           photocatalyst for hydrogen production under simulated solar light
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): W.P. Cathie Lee, Meei-Mei Gui, Lling-Lling Tan, Ta Yeong Wu, S. Sumathi, Siang-Piao Chai
      To overcome rapid electron-hole recombination and the need for employing noble metals as co-catalysts for photocatalytic water splitting, the present work reports on the fabrication of bismuth sulphide (Bi2S3)-modified molybdenum disulphide (MoS2) as an efficient hybrid photocatalyst. Under simulated solar light irradiation, the Bi2S3/MoS2 photocatalyst with an optimum molar ratio of Mo to Bi of 50% (mol/mol) achieved a H2 production rate of 61.4μmol/h. The photocatalytic enhancement was attributed to an effective charge transfer mechanism between Bi2S3 and MoS2, as evidenced by photoelectrochemical characterization. A plausible reaction mechanism over the as-prepared Bi2S3/MoS2 photocatalyst was also proposed based on the experimental results obtained.

      PubDate: 2017-05-17T07:55:16Z
       
  • Green oxidation of sulfides to sulfoxides and sulfones with H2O2 catalyzed
           by ionic liquid compounds based on Keplerate polyoxometalates
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Reza Fareghi-Alamdari, Negar Zekri, Ahmad Jamali Moghadam, Mostafa Riahi Farsani
      The hybrid catalyst of (NH4)2(MimAm)40[Mo132O372(CH3COO)30(H2O)72] (MimAm=3-Aminoethyl-1-methylimidazolium) was synthesized by self-assembly strategy. Catalyst was successfully used in the selective oxidation of various sulfides to corresponding sulfoxides and sulfones. All reactions were performed in water as a green solvent by 30% aqueous hydrogen peroxide as a green oxidant under mild reaction conditions. The catalyst showed high conversion and excellent selectivity toward a varied range of substrates and demonstrates excellent chemoselectivity in which other active functional groups such as hydroxyl and CC bond have been tolerated. Also, this hybrid catalyst could be simply separated by filtration, and showed excellent reusability without loss of activity after seven cycles.
      Graphical abstract image

      PubDate: 2017-05-17T07:55:16Z
       
  • Alkali tungsten bronzes as soot oxidation catalysts: The key role of
           electrodonor properties of catalytic surface
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Wojciech Kaspera, Sebastian Zieliński, Andrzej Kotarba
      The effect of bulk alkali (Li, Na, K, Cs) promotion on the tungsten(VI) oxide catalytic activity in soot oxidation was investigated. Catalyst oxidation and reduction susceptibility investigations have shown, that soot oxidation on the investigated catalysts operates through Mars van Krevelen mechanism. It has been also revealed, that increase in electrodonor properties (lowering the work function) of the AxWO3 (ALi, Na, K, Cs) catalysts results in enhancing the catalytic activity in soot oxidation with the promotional effect increasing in order: Cs<Na≪K≈Li.

      PubDate: 2017-05-17T07:55:16Z
       
  • Visible-light-enhanced photocatalytic Sonogashira reaction over silicon
           carbide supported Pd nanoparticles
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Bing Wang, Xiaoning Guo, Guoqiang Jin, Xiangyun Guo
      Sonogashira reaction of aryl halides with terminal alkynes can be realized by a visible-light-driven heterogeneous catalytic route using silicon carbide supported Pd nanoparticles as the catalyst under copper-, and ligand-free conditions. Under the irradiation of visible light, the photo-generated electrons excited in SiC can quickly transfer to Pd nanoparticles through the Mott-Schottky contact, and make them electron-rich. The electrons of Pd particles become energetic by absorbing the energy of visible light, and then transfer to halogen atoms to facilitate the cleavage of carbon-halogen bond in aryl halides. The final carbon-carbon formation is achieved by the substitution reaction and reductive elimination processes.
      Graphical abstract image

      PubDate: 2017-05-17T07:55:16Z
       
  • Pepsin-catalyzed vinylogous Michael addition of deconjugated butenolides
           and maleimides in water
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Meng-Jie Zhang, Rui Li, Yan-Hong He, Zhi Guan
      A pepsin catalyzed vinylogous Michael addition of deconjugated butenolides and maleimides in water has been successfully achieved, and γ,γ-disubstituted butenolides were obtained in up to 98% yields with up to 99:1dr.
      Graphical abstract image

      PubDate: 2017-05-17T07:55:16Z
       
  • Effect of Ce promoter on Rh-Fe/TiO2 catalysts for ethanol synthesis from
           syngas
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Dandan Xu, Haitao Zhang, Hongfang Ma, Weixin Qian, Weiyong Ying
      Rh/TiO2, Rh-Fe/TiO2 and Rh-Fe-Ce/TiO2 catalysts were prepared by the incipient wetness impregnation method for ethanol synthesis from syngas and investigated by XRD, N2 adsorption-desorption, XPS, CO-TPD and DRIFTS techniques. The results indicated that the incorporation of Ce to Rh-Fe/TiO2 effectively coordinated the appropriate proportion of linear, gem-dicarbonyl and bridged CO species, leading to a balance between CO dissociation and CO insertion, which resulted in enhancing the CO conversion and ethanol selectivity.

      PubDate: 2017-05-17T07:55:16Z
       
  • One-pot preparation of Ni-Cu nanoparticles supported on γ-Al2O3 as
           selective and stable catalyst for the Guerbet reaction of 1-octanol
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Willinton Y. Hernández, Kevin De Vlieger, Sander Clerick, Pascal Van Der Voort, An Verberckmoes
      This paper reports on the “in-situ” preparation-deposition and reduction of Ni-Cu nanoparticles (NPs) on γ-Al2O3 as support, using a green and elegant one-pot synthesis approach. Pristine and supported Ni-Cu NPs were evaluated as (de)hydrogenation catalysts for the Guerbet reaction of 1-octanol and compared with a classic impregnated and “ex-situ” reduced NiCu on γ-Al2O3 catalyst. XRD reavealed that the degree of Ni-Cu nano-alloying was insignificant in the one-pot preparation method, resulting in Ni-Cu nanocomposites, while the degree of nano-alloying was resp. low and very high in the pristine nanoparticles (NPs) and the classic impregnated catalyst. The degree of reduction was very similar for both the in-situ and ex-situ reduction treatments of the supported catalysts as demonstrated by H2 chemisorption. The “in-situ” prepared supported Ni-Cu NPs showed an enhanced kinetics when compared to the unsupported pristine Ni-Cu NPs, showing a beneficial effect of the metal-support interaction, however the classic impregnated catalyst showed overall the best kinetics, selectivity and stability for the Guerbet reaction of 1-octanol.

      PubDate: 2017-05-17T07:55:16Z
       
  • Cobalt-nitrogen-activated carbon as catalyst in acetylene
           hydrochlorination
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Wenli Zhao, Mingyuan Zhu, Bin Dai
      The development of new non-mercury based catalysts for the vinyl chloride industrial production has attracted recently the attention of many researchers. In spite of the good activity of Au-based supported catalysts reported so far, the high cost of gold impedes future use of such catalysts. In the present work, an environmentally friendly non-precious transition metal coordinated N-doped carbon material as a catalyst for acetylene hydrochlorination reaction was developed, which shows good catalytic performance. The catalyst was characterized by Transmission Electron Microscopy coupled with Energy Dispersive X-ray analysis (TEM-EDX), X-ray Diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS). The obtained results indicated that Co-N-AC catalyst can significantly improve the adsorption of HCl. And XPS result demonstrated the presence of Co-Nx, which plays a major role in acetylene hydrochlorination reaction.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Water-mediated promotion of the catalytic conversion of oleic acid to
           produce an alternative fuel using Pt/C without a H2 source
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Hao Chen, Kequan Chen, Jie Fu, Xiuyang Lu, He Huang, Pingkai Ouyang
      Preadsorbed water, along with the surrounding environment, significantly modulated the catalytic performance of Pt/C in the conversion of oleic acid to heptadecane. After adsorbing 20wt% and 30wt% H2O, the yield of heptadecane increased from 60% over the dried Pt/C to 65% and 70%, respectively. The preadsorbed water on Pt/C increased the acidity and adsorption properties of hydrotropic species, such as carboxyl (COOH), therefore, increasing catalytic performance. This could lead to facile improvement in the efficiency of catalyst performance without complicated or expensive surface modulation.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Isodewaxing catalyst for processing of middle distillate fractions
           obtained from oil and Fischer-Tropsch synthesis products mixture
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): L.A. Krasilnikova, A.I. Grudanova, L.A. Gulyaeva
      NiMo/ZSM-11/mordenite catalyst was developed for isodewaxing process of middle distillate fractions of oil and Fischer-Tropsch synthesis products to obtain diesel fuels for Arctic service and jet fuel. The catalyst contains the promoters B2O3, La2O3 and the mixture of amorphous aluminosilicate and γ-Al2O3 as a binder. During testing of the catalyst at pressure 3МPа, volume ratio hydrogen/feed 600m3/m3, temperature 310°С, LHSV 2.0h−1 jet fuel with chilling point not higher than 60°С below zero and diesel fuel with cold filter plugin point not higher than 44°С below zero were obtained with the yield 91.7% wt.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Insight of Pt-support interaction in S-Pt/Ce0.7Zr0.3O2 by in situ Raman
           spectroscopy
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Quanwen Wu, Jingwen Ba, Xiayan Yan, Jinchun Bao, Zhiyong Huang, Sanping Dou, Danling Dai, Tao Tang, Wenhua Luo, Daqiao Meng
      Strong Metal-Support Interactions (SMSI) are important in Pt supported catalysts for their catalytic performance. SMSI in Pt/CeO2, Pt/Ce0.7Zr0.3O2 and single atom S-Pt/Ce0.7Zr0.3O2 catalysts were studied by in situ Raman spectroscopy and H2 Temperature-Programmed Reduction. Evidence of SMSI in Pt/CeO2 and Pt/Ce0.7Zr0.3O2 that improve the reduction properties of supports other than H2 dissociation and spillover is obtained. It was also found that Pt-O and Pt-O-Ce bonding in the said catalysts play an important role in SMSI. The Pt bonding could be ascribed to Pt oxides species (Pt1+ and Pt2+) with different Pt adsorption sites on CeO2 surface and which act as intermediates in reduction process. This gives a new insight into the SMSI and explains the observed Pt/CeO2 reduction characteristics.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Stabilization of copper catalysts for hydrogenation of dimethyl oxalate by
           deposition of Ag clusters on Cu nanoparticles
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Yanting Liu, Jian Ding, Jieyong Yang, Jicheng Bi, Kefeng Liu, Jiangang Chen
      Novel Ag/Cu/SiO2 catalysts have been fabricated by galvanic deposition of Ag clusters on Cu nanoparticles for the first time. Although the Ag clusters in Ag/Cu/SiO2 covered about 20 to 30% of the Cu active surface, the turnover frequency is remarkably enhanced, resulting in a great improvement in the final DMO hydrogenation activity. More importantly, the obtained Ag/Cu/SiO2 catalyst achieves a lasting catalytic activity up to 1100h due to the strong interaction between Cu and Ag, which is among the best records for Cu-based catalysts.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Highly selective catalytic hydroconversion of benzyloxybenzene to bicyclic
           cyclanes over bifunctional nickel catalysts
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Xiao Zhou, Xian-Yong Wei, Zhong-Qiu Liu, Jing-Hui Lv, Yue-Lun Wang, Zhan-Ku Li, Zhi-Min Zong
      An active bifunctional nickel catalyst was prepared by decomposing Ni(CO)4 to highly dispersed metallic Ni onto Hβ zeolite and first applied in hydroconverting benzyloxybenzene (BOB), which was used as a lignin-related model compound. Ni/Hβ proved to be effective for converting BOB to bicyclic cyclanes (BCCs) via Calk O bond cleavage induced by H+ addition, benzylium addition to 2- and 4-positions in phenol, hydrogenation of benzene ring, dehydration, and H− abstraction. Compared to one-step conversion, the total BCC selectivity (TBCCS) significantly increases from catalytic hydroconversion of catalytically converted BOB by pretreatment under pressurized N2.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • A CeO2-MnOx core-shell catalyst for low-temperature NH3-SCR of NO
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Shihui Li, Bichun Huang, Chenglong Yu
      A CeO2-MnO x catalyst with a core-shell structure was prepared by a chemical deposition method and tested towards the low-temperature selective catalytic reduction of NO by NH3. The catalyst with a molar ratio of CeO2/MnO x =0.6, exhibited a relatively high conversion values of NO in the 110–220°C range and good resistance to SO2 and H2O at the space velocity of 40,000h−1. The excellent catalytic performance could be attributed to the presence of high crystalline α-MnO2, as well as high concentrations of Mn4+ and Ce3+. Notably, CeO2-MnO x catalyst showed relatively good resistance to SO2 due to its core-shell structure.

      PubDate: 2017-05-12T07:36:54Z
       
  • Highly active and stable TiO2-supported Au nanoparticles for CO2 reduction
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): V. Kyriakou, A. Vourros, I. Garagounis, S.A.C. Carabineiro, F.J. Maldonado-Hódar, G.E. Marnellos, M. Konsolakis
      Au nanoparticles (2.2nm) deposited on TiO2 by the deposition-precipitation method were found to be extremely active and stable for CO2 hydrogenation to CO. A CO2 to CO yield up to 50% was achieved at temperatures as low as 400°C for at least 60h. Under identical reaction conditions, both bare TiO2 and Au/Al2O3 were practically inactive for CO2 reduction. The unique combination of the Au nanoparticles and TiO2 support – linked to a peculiar synergistic effect – is essential to the enhanced CO2 reduction activity.

      PubDate: 2017-05-12T07:36:54Z
       
  • The catalytic oxidation of isoamyl alcohol on modified hexagonal
           mesoporous silicas (HMS)
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Wenbin Guan, Binxia Zhao, Han Gao, Naining Hu, Xiaoli Zhang
      Hexagonal mesoporous molecular sieves HMS and Al, Co doped HMS were synthesized by sol-gel method and subsequently, ZnO supported catalysts were prepared via wetness impregnation method. The samples were characterized by XRD, FT-IR and N2 adsorption-desorption. Then, they were used for selective oxidation of isoamyl alcohol to isovaleric acid. The results showed that HMS was successfully modified and ZnO supported Co doped HMS with a ZnO loading of 3wt% exhibited excellent catalytic performance.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Ligand-controlled fabrication of core-shell PdNi bimetallic nanoparticles
           as a highly efficient hydrogenation catalyst
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Zuojun Wei, Dilantha Thushara, Xinghua Li, Zuyi Zhang, Yingxin Liu, Xiuyang Lu
      A series of PdNi/SiO2 bimetallic nanoparticles were synthesized using polyvinylpyrrolidone (PVP) and 2,6-bis(5,6-dimethyl-1,2,4-triazine-3-yl) pyridine (BTP) as ligands through sol-gel method. BTP was proved to be an effective ligand that can delay the reduction of palladium (II), which helps the formation of palladium-rich shell bimetallic nanoparticles. Pd3Ni7-BTP/SiO2 exhibited the best catalytic performance (TOF=180h−1) among all the catalysts for hydrogenation of nitrobenzene under ambient conditions and was successfully reused for at least five times without loss in activity. The excellent catalytic performance could be ascribed to the small nanoparticle size (2.14nm) and the palladium-rich shell structure it bears.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Editorial Board/Aims &amp; Scope
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97


      PubDate: 2017-05-12T07:36:54Z
       
  • In-situ preparation of macro/mesoporous NiO/LaNiO3 pervoskite composite
           with enhanced methane combustion performance
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Longhui Nie, Jie Wang, Qiao Tan
      The macro/mesoporous NiO/LaNiO3 composite catalysts were prepared by a combined citric acid combustion and acetic acid (AA) in-situ treatment method. The results show that the NiO/LaNiO3 composite has bigger surface area and enhanced methane catalytic oxidation performance than LaNiO3 obtained only by a citric acid combustion method. Besides the bigger surface area, the enhanced catalytic performance is mainly attributed to the formation of more NiO particles on the surface of catalysts, which is helpful to activate the CH bond.

      PubDate: 2017-05-12T07:36:54Z
       
  • Copper oxide catalyst supported on niobium oxide for CO oxidation at low
           temperatures
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Emi Leung, Akiko Shimizu, Katayun Barmak, Robert Farrauto
      CuOx/Nb2O5 shows higher CO oxidation activity than CuOx/Al2O3. Analysis of X-ray photoelectron spectra shows the presence of Cu1+ species on Nb2O5, which is known to be the active species for CO oxidation. In contrast, only Cu2+ is found to be present on Al2O3. Enhanced activity of CuOx/Nb2O5 is consistent with its lower activation energy for CO oxidation compared with CuOx/Al2O3. It is argued that the formation of stable Cu1+ species on Nb2O5 is a result of presence of deep copper acceptor states within the band gap of Nb2O5. 6%CuOx/Nb2O5 shows comparable activity to 1%Pt/Al2O3 but loses its advantage above 500°C.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • Super-microporous silica-supported platinum catalyst for highly
           regioselective hydrosilylation
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Wenbin Hu, Huilin Xie, Hangbo Yue, Pepijn Prinsen, Rafael Luque
      Super-microporous micelle-templated platinum on silica catalysts were successfully prepared by an improved one-pot procedure, using a water/acetonitrile/n-dodecylamine mixture. The catalyst showed high surface area and narrow pore size and was further characterized by powder X-ray diffraction and inductively coupled plasma mass spectrometry. The unique super-microporous materials were proven to be highly active for the microwave-assisted hydrosilylation reaction of terminal alkenes or alkynes using dichloromethylsilane as silicon source. The super-microporous structure was beneficial for the control of hydrosilylation regioselectivity, as the selectivity to the β-adduct reached 99%. Moreover, the catalyst could be easily recovered by simple filtration and re-used seven times without appreciable loss of activity and selectivity.
      Graphical abstract image

      PubDate: 2017-05-12T07:36:54Z
       
  • AgCu/SiC-powder: A highly stable and active catalyst for gas-phase
           selective oxidation of alcohols
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Liang Zhao, Liping Kong, Chunze Liu, Yuanyuan Wang, Liyi Dai
      Highly active and selective bimetallic AgCu/SiC-powder catalysts have been prepared by a facile method for the gas-phase selective oxidation of alcohols (such as 99.3% benzyl alcohol conversion and 99.6% benzyl aldehyde selectivity). The catalytic activity can maintain at least 200h compared with Cu/SiC (only within 10h). The formation of Ag-Cu2O ensembles brings about enhanced improvement both in conversion and stability. The XPS results reveal that large amounts of Ag0-Cu2O active sites formed after pre-activation process and Cu2O sites play a dominant role in benzyl alcohol oxidation reaction. Dehydrogenation reaction process has also been confirmed by O2-TPD.

      PubDate: 2017-05-07T01:55:16Z
       
  • Ce-Co catalyst with high surface area and uniform mesoporous channels
           prepared by template method for Hg0 oxidation
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Xiaopeng Zhang, Jinxin Wang, Bojian Tan, Zhuofeng Li, Yuezong Cui, Gaohong He
      Ce-Co catalyst was prepared by template method (denoted as Ce-Co-T) and co-precipitation method (denoted as Ce-Co-C) for element mercury oxidation. Structural results showed that Ce-Co-T had a much larger BET surface area (220.01m2/g) and uniform mesoporous channels along with uniform particle size which could lead to more surface active sites. XPS showed that Ce-Co-T had more surface active oxygen species resulting in a better redox property. Compared with Ce-Co-C, Ce-Co-T had a much better Hg0 oxidation efficiency which maintained above 95% under a high GHSV (180, 000h−1) in the range 150–350°C.
      Graphical abstract image

      PubDate: 2017-05-07T01:55:16Z
       
  • Solvothermal synthesis of BiOI flower-like microspheres for efficient
           photocatalytic degradation of BPA under visible light irradiation
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Huachun Lan, Gong Zhang, Hongwei Zhang, Huijuan Liu, Ruiping Liu, Jiuhui Qu
      In this study, BiOI was fabricated via a solvothermal synthesis method. Based on characterization using XRD, BET, SEM, TEM and XPS, layered-structure BiOI with a pure orthorhombic phase and flower-like microsphere morphology was successfully prepared. Compared with P25 TiO2, BiOI had higher photocatalytic activity towards 2,2-bis(4-hydroxyphenyl)propane (BPA) degradation under visible light irradiation. The results of photocurrent generation also proved that BiOI had excellent photocurrent response to visible light. Hence, the good photocatalytic performance of BiOI was attributed to its enhanced light absorption and separation of photogenerated electrons and holes. ESR measurements further confirmed that hydroxyl radicals were generated and involved in the BPA photodegradation process.

      PubDate: 2017-05-07T01:55:16Z
       
  • A novel approach to vapor-phase synthesis of 2- and 4-methylquinoline from
           lactic acid and aniline
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): An Li, Chen Huang, Cai-Wu Luo, Li-Jun Li, Wen-Jun Yi, Tian-Wei Liu, Zi-Sheng Chao
      A novel and green route for vapor-phase synthesis of 2- and 4-methylquinoline was provided in this work, in which lactic acid as one of the reactants was for the first time employed. Various influencing factors, including types of catalysts, reaction temperature and stability of catalyst were investigated systematically. The results showed that a 67.6% total yield of quinolines was obtained over the HBeta catalyst. The characterization by using BET, NH3-TPD and pyridine-IR techniques revealed that strong Brønsted acid sites are favorable for generation of 2- and 4-methylquinoline whereas Lewis acid sites could increase the proportion of 4-methylquinoline in target products. Besides, a feasible reaction pathway to synthesize 2- and 4-methylquinoline was proposed on the basis of the reaction products.

      PubDate: 2017-05-07T01:55:16Z
       
  • Chemoselective flow hydrogenation of α,β – Unsaturated
           aldehyde with nano-nickel
    • Abstract: Publication date: 10 July 2017
      Source:Catalysis Communications, Volume 98
      Author(s): Damian Giziński, Ilona Goszewska, Maciej Zieliński, Dmytro Lisovytskiy, Kostiantyn Nikiforov, Joanna Masternak, Małgorzata Zienkiewicz-Machnik, Anna Śrębowata, Jacinto Sá
      Herein, it is presented a novel catalytic system for the continuous-flow chemoselective hydrogenation of α,β – unsaturated aldehydes used in the production of high-value cosmetics and pharmaceuticals precursors. The reaction was catalyzed by nano-nickel particles grafted on polymeric support, synthesized via a simple, adaptable and green methodology. The system was highly active and very selective to CC bond saturation.
      Graphical abstract image

      PubDate: 2017-05-07T01:55:16Z
       
  • Deactivation behavior of CrOy/Al2O3-ZrO2 catalysts in the dehydrogenation
           of propane to propylene by lattice oxygen
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Tae Hyeop Kim, Min Yeong Gim, Ji Hwan Song, Won Choon Choi, Yong-Ki Park, Ung Gi Hong, Deuk Soo Park, In Kyu Song
      A series of thermally deactivated CrOy/Al2O3-ZrO2 catalysts with different Zr/Al molar ratio (denoted as Cr/AZ-X, X=Zr/Al molar ratio) were prepared for use in the dehydrogenation of propane to propylene by lattice oxygen of the catalysts. It was found that α-chromia-alumina phase was formed as a result of catalyst deactivation. The relative distribution of chromium species was different depending on Zr/Al molar ratio of the catalysts. Among the catalysts, Cr/AZ-0.07 catalyst with the lowest amount of α-chromia-alumina and the largest amount of active chromium species (Cr3+) showed the best catalytic activity in the dehydrogenation of propane to propylene.
      Graphical abstract image

      PubDate: 2017-05-07T01:55:16Z
       
  • Synthesis of Yb3+/Ho3+ co-doped Bi2WO6 upconversion photocatalyst with
           highly improved visible light photocatalytic activity
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Hong Li, Hongshun Hao, Shanshan Jin, Weihua Guo, Xiaofei Hu, Hongman Hou, Gongliang Zhang, Shuang Yan, Wenyuan Gao, Guishan Liu
      As a novel visible-light-driven photocatalyst, Yb3+/Ho3+ co-doped Bi2WO6 (Yb3+/Ho3+-Bi2WO6) was synthesized via a simple hydrothermal method and subsequent a calcination process. The as-synthesized Yb3+/Ho3+-Bi2WO6 samples were characterized by various analytical methods. The BIW-5 (Yb3+/Ho3+ molar ratios is 5) sample showed the highest photocatalytic activity. The RhB was degraded (99.8%) under visible light irradiation in 20min. The improved photocatalytic activity could be attributed to the efficient energy transfer between Yb3+/Ho3+ and Bi2WO6 via infrared to visible upconversion and the reduced combination rate of photogenerated electron-hole pairs through doping Yb3+/Ho3+ ions. Therefore, this study may provide a better method to obtain stable upconversion photocatalyst with greatly improved activity.

      PubDate: 2017-05-01T03:27:43Z
       
  • Effect of niobium oxide phase on the furfuryl alcohol dehydration
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Xiaojun Chan, Tiancheng Pu, Xianyin Chen, Alwin James, Jaeha Lee, John B. Parise, Do Heui Kim, Taejin Kim
      Different structural phases (e.g., TT, T, and H) of niobium oxide were synthesized, characterized by XRD and Raman, and utilized for the furfuryl alcohol dehydration and condensation under mild conditions (100°C and ambient pressure). Furfuryl alcohol conversion was dependent on reaction time and niobium oxide phase. Niobic acid and T/H phase transitional niobium oxide showed higher catalytic activity in comparison to a single crystalline phase niobium oxide. While T/H phase transitional niobium oxide showed higher conversion than that of niobic acid and TT phase niobium oxide, higher C9-C15 products' selectivity (>60%) was obtained with the latter catalysts.
      Graphical abstract image

      PubDate: 2017-05-01T03:27:43Z
       
  • Nanoflower-like Mg-doped MnOx for facile removal of low-concentration NOx
           at room temperature
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Linyu Pan, Xiaoxia Zhou, Han Zhao, Gang Wan, Qianru Li, Ning Wang, Weimin Huang, Hangrong Chen
      Nanoflower-like Mg doped MnOx (Mg/MnOx) is synthesized via a facile and scalable redox reaction strategy for facile removal of low-concentration NOx at room temperature. The optimized sample Mg/MnOx exhibits good activity, giving 100% NO removal efficiency at room temperature for 10h under extremely high space velocity of 120,000mL−1 g−1 h−1 and low NO inlet concentration of 10ppm. The Mg/MnOx is found to gradually get inactive resulted from the generated NO2 and large amount of adsorbed NO covering active sites based on the results of characterizations and performance. Furthermore, the superior monolithic catalyst indicates great potential in actual application.
      Graphical abstract image

      PubDate: 2017-05-01T03:27:43Z
       
  • HKUST-1 catalyzed room temperature hydrogenation of acetophenone by
           silanes
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Amarajothi Dhakshinamoorthy, Mercedes Alvaro, Hermenegildo Garcia
      Cu3(BTC)2 (BTC: 1,3,5-benzenetricarboxylate) is able to promote hydrogenation of acetophenone to 1-phenylethanol by phenylsilane at room temperature in toluene. Other silanes with larger molecular size were found less reactive or inactive for the process. Cu3(BTC)2 was more active than copper acetate and cuprous chloride as homogeneous catalysts. On the other hand, Fe(BTC) and Al(OH)(BDC) (BDC: 1,4-benzenedicarboxylate) were found inactive as solid catalysts under the same reaction conditions. It was however, observed that Cu3(BTC)2 is not stable during the reaction.
      Graphical abstract image

      PubDate: 2017-05-01T03:27:43Z
       
  • Vapor-phase hydrogenation of levulinic acid to γ-valerolactone over
           Cu-Ni bimetallic catalysts
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Rei Yoshida, Daolai Sun, Yasuhiro Yamada, Satoshi Sato, Graham J. Hutchings
      Vapor-phase hydrogenation of levulinic acid (LA) to γ-valerolactone (GVL) was performed over SiO2-supported Cu-Ni bimetallic catalysts with different Cu/Ni weight ratios under ambient H2 pressure. Characterization of the catalysts was carried out using powder X-ray diffraction, temperature-programmed reduction and thermogravimetric analysis. In contrast to the monometallic catalysts i.e. Ni/SiO2 and Cu/SiO2, the Cu-Ni/SiO2 bimetallic catalyst with a Cu/Ni weight ratio of 6/14 exhibits an excellent catalytic activity, and gave a GVL yield higher than 99% with a productivity of 1.64kgGVL kgcat. −1 h−1 at 250°C and at a high WHSV of 1.65h−1 for 50h.
      Graphical abstract image

      PubDate: 2017-05-01T03:27:43Z
       
  • Hydrogenation of nitrobenzene to aniline catalyzed by C60-stabilized Ni
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Yingmin Qu, Hao Yang, Songlin Wang, Tong Chen, Gongying Wang
      The C60-stabilized Ni catalyst, denoted as Ni/C60, was prepared by regular impregnation following the chemical reduction and employed to catalyze hydrogenation of nitrobenzene. The characterizations suggested that reductants, NaBH4 amount and nickel precursor influenced metallic Ni concentration on surface of catalyst, and C60 improved the dispersion of Ni and reduced the electron density of metallic Ni. The nitrobenzene conversion and the aniline selectivity both reached above 99.9% over Ni/C60, within 40min under 90°C and 2MPa of H2. C60 improved the aniline selectivity and enhanced the stability of Ni/C60 ascribed to its hydrophobicity.
      Graphical abstract image

      PubDate: 2017-05-01T03:27:43Z
       
  • A facile method to promote LaMnO3 perovskite catalyst for combustion of
           methane
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Ya Ding, Sheng Wang, Lei Zhang, Zhiping Chen, Mingzhe Wang, Shudong Wang
      This work concentrates on the improvement of LaMnO3 perovskite catalysts for methane combustion by an effective and mild citric acid etching strategy. The etched catalysts showed improved catalytic activity due to higher surface area, abundant vacancies, higher surface Mn4+/Mn3+ ratio and more active oxygen species. Furthermore, the pre-treated catalysts maintained good stability because of the maintenance of perovskite structure.

      PubDate: 2017-05-01T03:27:43Z
       
  • B-cation partial substitution of double perovskite La2NiTiO6 by Co2+:
           Effect on crystal structure, reduction behavior and catalytic activity
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Pablo V. Tuza, Mariana M.V.M. Souza
      Graphical abstract image

      PubDate: 2017-05-01T03:27:43Z
       
  • Synthesis of (S)-3-chloro-1-phenylpropanol by permeabilized recombinant
           Escherichia coli harboring Saccharomyces cerevisiae YOL151W reductase in
           2-methyltetrahydrofuran cosolvent system
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Yanjun Tian, Xiaoqiang Ma, Meng Yang, Dongzhi Wei, Erzheng Su
      2-methyltetrahydrofuran, an ecofriendly substitute for traditional organic solvents, was employed to construct cosolvent system for synthesis of (S)-3-chloro-1-phenylpropanol by permeabilized recombinant Escherichia coli containing the YOL151W reductase and Escherichia coli containing d-glucose dehydrogenase to regenerate NADPH. By optimization, 30mM 3-chloro-1-phenyl-1-propanone could be efficiently converted to (S)-3-chloro-1-phenylpropanol with a yield of 98.6% and enantiomeric excess of more than 99.9% in 3% (v/v) of 2-methyltetrahydrofuran, 2% (v/v) of Triton X-100 and Tris-HCl buffer coslovent system. The application of 2-methyltetrahydrofuran has proved to be a promising cosolvent for asymmetric reduction of water-insoluble prochiral ketones.

      PubDate: 2017-04-24T02:38:18Z
       
  • Efficient bioreductive production of (R)-N-Boc-3-hydroxypiperidine by a
           carbonyl reductase
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Li-Feng Chen, Yi-Ping Zhang, Hai-Yang Fan, Kai Wu, Jin-Ping Lin, Hua-Lei Wang, Dong-Zhi Wei
      The 3-hydroxypiperidine moiety is a privileged scaffold encountered in many bioactive compounds. An NADPH-dependent reductase (YGL039W) from Kluyveromyces marxianus ATCC 748 was isolated to show excellent catalytic activity in (R)-N-Boc-3-hydroxypiperidine [(R)-NBHP] production. Using a GDH-catalyzed cofactor-recycling system to ensure a sufficient supply of NADPH, the effects of temperature, pH, metal ions, substrate concentration, biocatalyst dosage, and cofactors on the YGL039W-catalyzed bioreduction were investigated and optimized. Finally, an extremely high concentration of N-Boc-piperidin-3-one (NBPO, 400g/L) could be completely reduced to (R)-NBHP (>99% ee), with a total turnover number of 20,000. This process shows significant potential for the industrial production of (R)-NBHP.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • iTPR - a new methodical approach for temperature programmed reduction of
           catalysts with improved sensitivity
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): A.G. Thomé, S. Peters, F. Roessner
      A new method for temperature programmed reduction (TPR) of reducible bulk or supported metal compounds with hydrogen is presented. The setup, involving a flame ionization detector (FID) and methanizer, allows to study the reduction behavior of amounts down to 0.1mg as shown for the reduction of Cu2O. By co-feeding CO2 in excess, hydrogen is converted into methane which is then detected by the FID.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Hydroconversion of C18 fatty acids using PtNi/Al2O3: Insight in the role
           of hydroxyl groups in Al2O3
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Hao Chen, Xiangwen Zhang, Qingfa Wang
      The catalytic hydroconversion of C18 fatty acids over PtNi/Al2O3 catalysts was investigated to explore the role of hydroxyls in Al2O3 on the catalytic activity. The amount of hydroxyls in acidic Al2O3 was 2.5 times that in neutral Al2O3 but with the same acidity. High content of hydroxyl in Al2O3 increased the NiPt-Al2O3 interaction and differed the Pt valence distribution. The NiPt/acidic Al2O3 catalyst showed 56% DCO2 while the Ni-Pt/neutral Al2O3 catalyst showed 58% DCO products due to the different NiPt-Al2O3 interaction. The high amount of Pt4+ species in NiPt alloy contributed to the high selectivity of DCO2 reaction.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Peculiarity of Rh bulk diffusion in La-doped alumina and its impact on CO
           oxidation over Rh/Al2O3
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Vladimir O. Stoyanovskii, Aleksey A. Vedyagin, Alexander M. Volodin, Roman M. Kenzhin, Yury V. Shubin, Pavel E. Plyusnin, Ilya V. Mishakov
      The catalytic behavior and stability of rhodium supported on pure and La-doped alumina were studied towards the CO oxidation reaction. Diffusion of Rh3+ ions into the bulk of support was shown to cause rapid deactivation in both cases. Alumina doping with La leads to modification of the alumina donor sites, concentrating of Rh near such sites, and acceleration of Rh3+ diffusion process. Diffused Rh ions were shown by means of photoluminescence to localize in the nearest coordination environment of the La ions in La-enriched alumina starting from a calcination temperature of 800°C.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Effect of ethylene glycol concentration on the morphology and catalytic
           properties of TiO2 nanotubes
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Hua Song, Kai Cheng, Haifeng Guo, Fang Wang, Junlei Wang, Ningfang Zhu, Mingxing Bai, Xueqin Wang
      Effect of ethylene glycol (EG) concentration on the micromorphology and photocatalytic property of TiO2 nanotubes was investigated. When EG concentration is varied from 10% to 90%, Ti foil was first oxidized to form a multiporous structure, and the nanotube structure was observed at EG concentration of 70%. Increasing the EG concentration further resulted in more regular and longer TiO2 nanotube arrays with smaller diameters. The photocatalysis experiments showed that the nanotube structure was beneficial for the photocatalytic degradation of Rhodamine B; however, TiO2 nanotubes with smaller diameters displayed decreased catalytic activity.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Magnetic nanocomposite based on functionalized salep as a green support
           for immobilization of palladium nanoparticles: Reusable heterogeneous
           catalyst for Suzuki coupling reactions
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Ali Pourjavadi, Anahita Motamedi, Zohreh Marvdashti, Seyed Hassan Hosseini
      The synthesis and catalytic behavior of palladium loaded magnetic nanocomposite based on natural polysaccharide salep modified with poly (amino pyridine) is described. The synthesized support is loaded with relatively large amounts of palladium ions (0.34mmol g−1). This is a simple, ecologically safe and cost-effective route for the preparation of the novel heterogeneous catalyst that shows high activity for Suzuki coupling reactions under remarkably mild conditions. Furthermore, the prepared catalyst is magnetically recovered and effectively reused for seven cycles of reactions without significant loss of its catalytic activity and loaded palladium nanoparticles.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • Enhanced onset potential NiMn-decorated activated carbon as effective and
           applicable anode in urea fuel cells
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Nasser A.M. Barakat, Mohannad Alajami, Yazan Al Haj, M. Obaid, Saeed Al-Meer
      Basically, to be used as an anode in the air-cathode fuel cells, the onset potential of the introduced material should be lower than the ORR potential. Unfortunately, especially in the field of urea fuel cells, most of the reported electrocatalysts do not own this very important feature. NiMn nanoparticles-decorated activated carbon is introduced as strongly enhanced onset potential and highly effective electrocatalyst for urea oxidation. For bimetallic nanoparticles having 10wt% Mn, the corresponding onset potential is ˗85mV (vs. Ag/AgCl) with a corresponding current density of 130mA·cm−2. However, other contents (0, 20 and 30wt%) of Mn do not show this high improvement in the electrocatalytic activities. Decoration of the activated carbon can be achieved by hydrothermal treatment of the metals acetates/activated carbon aqueous suspension followed by fast cooling to perform sudden transformation of the subcritical water to a normal one. Later on, the powder is sintered in argon atmosphere at 850°C. Fortunately, the characterizations confirmed that the modified activated carbon is decorated by pristine NiMn nanoparticles rather than the expected oxides.
      Graphical abstract image

      PubDate: 2017-04-17T02:16:45Z
       
  • CuTi LDH derived NH3-SCR catalysts with highly dispersed CuO active phase
           and improved SO2 resistance
    • Abstract: Publication date: 5 July 2017
      Source:Catalysis Communications, Volume 97
      Author(s): Yu Nie, Qinghua Yan, Sining Chen, Dermot O'Hare, Qiang Wang
      Dispersed CuyTi1Ox catalysts derived from Cu-Ti-CO3 layered double hydroxides (LDHs) were successfully prepared. Due to the better dispersion of active CuO phase, the optimal catalyst Cu1Ti1Ox reached a high NO x conversion of 88.9% at 200°C, which is significantly higher than that of the control catalyst 10wt% CuO/TiO2 (29.5%). Cu1Ti1Ox catalyst also showed improved SO2 resistance, with a very stable NO x conversion of 76.4% at 200°C after 8h running with 50ppm SO2, much higher than that of 10wt% CuO/TiO2 (3.3%). The reaction mechanism was discussed with NH3-TPD and H2-TPR analyses, which indicated that Cu1Ti1Ox has more surface acidic sites and higher redox property than 10wt% CuO/TiO2. In all, CuyTi1Ox prepared from Cu-Ti LDH precursor can work as highly efficient and SO2 resistant low-temperature NH3-SCR catalyst for NO x removal.

      PubDate: 2017-04-17T02:16:45Z
       
 
 
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