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  Subjects -> CHEMISTRY (Total: 767 journals)
    - ANALYTICAL CHEMISTRY (45 journals)
    - CHEMISTRY (532 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (24 journals)
    - INORGANIC CHEMISTRY (40 journals)
    - ORGANIC CHEMISTRY (40 journals)
    - PHYSICAL CHEMISTRY (64 journals)

CHEMISTRY (532 journals)            First | 1 2 3 4 5 6 | Last

Journal of Immunoassay and Immunochemistry     Hybrid Journal   (Followers: 3)
Journal of Inclusion Phenomena and Macrocyclic Chemistry     Hybrid Journal   (Followers: 2)
Journal of Inorganic Biochemistry     Hybrid Journal   (Followers: 2)
Journal of Labelled Compounds and Radiopharmaceuticals     Hybrid Journal   (Followers: 1)
Journal of Macromolecular Science, Part A: Pure and Applied Chemistry     Hybrid Journal   (Followers: 4)
Journal of Mass Spectrometry     Hybrid Journal   (Followers: 20)
Journal of Materials Chemistry A : Materials for Energy and Sustainability     Full-text available via subscription   (Followers: 23)
Journal of Materials Chemistry B : Materials for Biology and Medicine     Full-text available via subscription   (Followers: 5)
Journal of Materials Chemistry C : Materials for Optical, Magnetic and Electronic Devices     Full-text available via subscription   (Followers: 6)
Journal of Materials Research     Full-text available via subscription   (Followers: 9)
Journal of Mathematical Chemistry     Hybrid Journal   (Followers: 4)
Journal of Medicinal Chemistry     Full-text available via subscription   (Followers: 157)
Journal of Membrane Science     Hybrid Journal   (Followers: 9)
Journal of Modern Chemistry & Chemical Technology     Full-text available via subscription   (Followers: 2)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 2)
Journal of Molecular Graphics and Modelling     Hybrid Journal   (Followers: 3)
Journal of Molecular Liquids     Hybrid Journal   (Followers: 3)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 3)
Journal of Molecular Recognition     Hybrid Journal   (Followers: 1)
Journal of Molecular Spectroscopy     Hybrid Journal   (Followers: 6)
Journal of Molecular Structure     Hybrid Journal   (Followers: 3)
Journal of Nanoparticles     Open Access  
Journal of Nanostructure in Chemistry     Open Access   (Followers: 5)
Journal of Natural Gas Chemistry     Full-text available via subscription   (Followers: 2)
Journal of Nepal Chemical Society     Open Access  
Journal of Nucleic Acids Investigation     Open Access   (Followers: 2)
Journal of Ocean University of China (English Edition)     Hybrid Journal   (Followers: 2)
Journal of Organometallic Chemistry     Hybrid Journal   (Followers: 12)
Journal of Photochemistry and Photobiology A: Chemistry     Hybrid Journal   (Followers: 4)
Journal of Photochemistry and Photobiology C: Photochemistry Reviews     Full-text available via subscription   (Followers: 4)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 160)
Journal of Polymers     Open Access   (Followers: 1)
Journal of Porphyrins and Phthalocyanines     Hybrid Journal   (Followers: 2)
Journal of Pure and Applied Chemistry Research     Open Access  
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 9)
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 13)
Journal of Solution Chemistry     Hybrid Journal  
Journal of Structural Chemistry     Hybrid Journal  
Journal of Sulfur Chemistry     Hybrid Journal   (Followers: 2)
Journal of Superhard Materials     Hybrid Journal   (Followers: 1)
Journal of Surfactants and Detergents     Hybrid Journal   (Followers: 5)
Journal of Systems Chemistry     Open Access   (Followers: 1)
Journal of Taibah University for Science     Open Access  
Journal of the American Chemical Society     Full-text available via subscription   (Followers: 238)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 16)
Journal of the American Society of Brewing Chemists     Full-text available via subscription   (Followers: 1)
Journal of the Bangladesh Chemical Society     Open Access  
Journal of the Chilean Chemical Society     Open Access   (Followers: 2)
Journal of the Iranian Chemical Society     Hybrid Journal   (Followers: 1)
Journal of the Korean Society for Applied Biological Chemistry     Hybrid Journal   (Followers: 1)
Journal of the Mexican Chemical Society     Open Access   (Followers: 1)
Journal of Theoretical and Computational Chemistry     Hybrid Journal   (Followers: 7)
Journal of Theoretical Chemistry     Open Access  
Journal of Wood Chemistry and Technology     Hybrid Journal   (Followers: 7)
JPC - Journal of Planar Chromatography - Modern TLC     Full-text available via subscription   (Followers: 6)
Jurnal Penelitian Sains (JPS)     Open Access  
Jurnal Teknologi Informasi     Open Access   (Followers: 3)
Kinetics and Catalysis     Hybrid Journal   (Followers: 3)
Korea-Australia Rheology Journal     Hybrid Journal  
Langmuir     Full-text available via subscription   (Followers: 35)
Latvian Journal of Chemistry     Open Access   (Followers: 1)
Lebensmittelchemie     Hybrid Journal   (Followers: 1)
Lipid Insights     Open Access   (Followers: 1)
Luminescence     Hybrid Journal   (Followers: 1)
Macromolecular Materials & Engineering     Hybrid Journal   (Followers: 4)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 4)
Macromolecular Research     Hybrid Journal  
Macromolecular Symposia     Hybrid Journal  
Macromolecular Theory and Simulations     Hybrid Journal  
Macromolecules     Full-text available via subscription   (Followers: 31)
Magnetic Resonance in Chemistry     Hybrid Journal   (Followers: 4)
Main Group Chemistry     Hybrid Journal  
Marine Chemistry     Hybrid Journal   (Followers: 4)
Marine Drugs     Open Access   (Followers: 4)
MATEC Web of Conferences     Open Access  
Materials Characterization     Hybrid Journal   (Followers: 21)
Materials Horizons     Full-text available via subscription  
Materials Research Bulletin     Hybrid Journal   (Followers: 16)
Materials Science Monographs     Full-text available via subscription   (Followers: 1)
Materials Science-Poland     Hybrid Journal  
Materials Sciences and Applications     Open Access   (Followers: 4)
MedChemComm     Full-text available via subscription   (Followers: 4)
Medicinal Chemistry Research     Hybrid Journal   (Followers: 10)
Metallography, Microstructure, and Analysis     Hybrid Journal   (Followers: 1)
Metallomics     Full-text available via subscription  
Micro and Nano Systems Letters     Open Access   (Followers: 1)
Microchimica Acta     Hybrid Journal   (Followers: 2)
Microporous and Mesoporous Materials     Hybrid Journal   (Followers: 3)
Modern Research in Catalysis     Open Access   (Followers: 2)
Molbank     Open Access  
Molecules     Open Access   (Followers: 3)
Molecules and Cells     Hybrid Journal   (Followers: 1)
Monatshefte für Chemie - Chemical Monthly     Hybrid Journal   (Followers: 3)
Moscow University Chemistry Bulletin     Hybrid Journal   (Followers: 2)
MRS Bulletin     Full-text available via subscription   (Followers: 5)
MRS Online Proceedings     Full-text available via subscription   (Followers: 1)
Nachrichten aus der Chemie     Full-text available via subscription   (Followers: 1)
Nano Convergence     Open Access  
Nano Reviews     Open Access   (Followers: 15)

  First | 1 2 3 4 5 6 | Last

Journal Cover Kinetics and Catalysis
   Journal TOC RSS feeds Export to Zotero [5 followers]  Follow    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
     ISSN (Print) 1608-3210 - ISSN (Online) 0023-1584
     Published by Springer-Verlag Homepage  [2210 journals]   [SJR: 0.25]   [H-I: 19]
  • Surface reactions of dimethyl ether on γ-Al       class="a-plus-plus">2O       class="a-plus-plus">3: 1. Adsorption and thermal
           effects
    • Abstract: Abstract Reactions of dimethyl ether (DME) over γ-Al2O3 at 250°C have been investigated in a flow catalytic reactor. The main products of the interaction between DME and alumina are methanol and water. Heat evolution is observed as DME is passed over alumina, and replacing DME with nitrogen gives way to heat absorption. Calcination of alumina before the reaction considerably strengthens the exotherm, which is due to DME adsorption, while the endotherm is due to the desorption of weakly bound DME. The role of the hydroxyl groups of γ-Al2O3 in methanol and water formation has been elucidated. Treating alumina with water vapor after bringing it into contact with DME completely restores the hydroxyl cover and replaces strongly adsorbed DME with hydroxyl groups.
      PubDate: 2014-07-01
       
  • Kinetics of the catalytic decomposition of dichloromethane and
           trichloromethane
    • Abstract: Abstract The kinetics of the catalytic decomposition of dichloromethane and trichloromethane in a single row plug flow reactor at 400–500°C has been studied. Dichloromethane decomposes into carbon and hydrogen chloride (presumably via the intermediate formation of monochlorocarbene). Trichloromethane decomposes mainly into carbon, hydrogen chloride and tetrachloromethane (presumably via the intermediate formation of dichlorocarbene).
      PubDate: 2014-07-01
       
  • Kinetics of water oxidation with cerium(IV) compounds catalyzed by a
           tetranuclear ruthenium complex
    • Abstract: Abstract The kinetics and mechanism of water oxidation with cerium(IV) compounds catalyzed by a tetranuclear ruthenium complex containing two polyoxotungstate ligands are reported. Four water molecules are oxidized via an eight-electron process to form two oxygen molecules.
      PubDate: 2014-07-01
       
  • Effect of the modification of nanocrystalline MgO aerogels with vanadium
           and carbon on the destructive sorption of CF       class="a-plus-plus">2Cl       class="a-plus-plus">2 and CFCl       class="a-plus-plus">3
    • Abstract: Abstract The effect of the promotion of nanocrystalline MgO aerogels with small amounts of vanadium and carbon on the destructive sorption of the Freons CF2Cl2 and CFCl3 was studied. It was found that the introduction of the promoters considerably shortened the induction period of the reaction. The pretreatment of samples modified with vanadium in an oxidizing or reducing atmosphere did not significantly affect the duration of the induction period. It was established that the acceleration of the reaction by fine-particle carbon did not depend on the mutual arrangement of carbon and MgO: on the surface of MgO nanoparticles, in the form of their mechanical mixture, or at separate positions in a reactor. It was concluded that the modifiers catalytically affect the interaction of MgO aerogels with Freons to accelerate the formation of active centers on the surface of their nanoparticles.
      PubDate: 2014-07-01
       
  • Kinetic model and mechanism of the acid dissociation of        class="a-plus-plus">d-metal
           bis(dipyrrolylmethenates)
    • Abstract: Abstract A kinetic model and a mechanism have been developed by quantum chemical simulation for the protolytic dissociation of dinuclear homoleptic bis(dipyrrolylmethenates) of d-metals (M) with the general formula [M2L2] and a double-helix structure. The reaction is described by a third-order equation that is first-order with respect to the complex and second-order with respect to the acid. The main contribution to the total dissociation rate is made by the rate-determining step, specifically, attack of the second acetic acid molecule on the nitrogen atom of one of the coordination sites of the helicate. The dinuclear helicates of 3,3′-bis(dipyrrolylmethenes) are more inert in an acidic medium than 2,3′- and 2,2′-bis(dipyrrolylmethenes).
      PubDate: 2014-07-01
       
  • Catalytic properties of Fe-HMS materials in the phenol oxidation
    • Abstract: Abstract Iron-incorporated mesoporous silica material Fe-HMS-50 (the Si/Fe molar ratio in the precursor gel is 50) was synthesized at ambient temperature by using hexadecylamine as a template and characterized by chemical analysis and N2 adsorption measurements. The catalytic performance of Fe-HMS was studied in the phenol hydroxylation and wet phenol oxidation with H2O2 at 313 K. The effect of pH, H2O2: PhOH molar ratio and stability of the catalyst on the oxidation process was investigated. In the phenol oxidation, the activity of the catalyst increases by increasing the acidity of the reaction mixture to pH 3.4 and the amount of leached iron species was 1.95 ppm. A recycling test indicates that the catalyst recovered by drying in air at 423 K suffered, after the first run, a 12.4% drop in the catalytic activity. Fe-HMS has high catalytic activity and selectivity to dihydroxybenzene in the phenol hydroxylation. Hydroquinone was found as the predominant product under these experimental conditions with small amounts of benzoquinone appearing at the end of the reaction.
      PubDate: 2014-07-01
       
  • Synthesis, characterization, and application of cobalt hydrogen sulfate as
           a new heterogeneous, reusable and efficient catalyst in one-pot synthesis
           of 14-aryl-14H-dibenzo[a,j]xanthenes and 1,8-dioxooctahydroxanthenes
    • Abstract: Abstract Cobalt hydrogen sulfate is synthesized and characterized by XRD, FTIR and TEM measurements. The efficiency of this readily available, cheap, non-toxic, heterogeneous and reusable catalyst is shown in the one-pot preparation of aryl- and alkyl-14H-dibenzoxanthenes and 1,8-dioxooctahydroxanthene derivatives by cyclocondensation of substituted benzaldehydes and β-naphthol or 5,5-dimethyl-1,3-cyclohexanedione respectively. Among advantages of these methods are high yields, a clean reaction strategy, simple methodology, green conditions and easy workup.
      PubDate: 2014-07-01
       
  • State and properties of ion-exchanged cations in zeolites: 1. IR spectra
           and chemical activation of adsorbed molecular hydrogen
    • Abstract: Abstract Adsorption isotherms and of adsorbed molecular hydrogen indicate that H2 is weakly adsorbed by alkali-metal forms of faujasites, mordenite, and high-silica zeolite ZSM-5. The alkaline-earth forms of the same zeolites adsorb hydrogen somewhat more strongly; nevertheless, the hydrogen molecules adsorbed by the barium form of mordenite are in the hindered rotation state. Molecular hydrogen is most strongly adsorbed by the zinc and cadmium forms of the high-silica zeolite. In this case, molecular hydrogen is strongly polarized and undergoes heterolytic dissociative adsorption, yielding acidic hydroxyl groups and cation-bound hydride ions.
      PubDate: 2014-07-01
       
  • Arrangement of acid sites on the surfaces of anatase titanium dioxide
           nanoparticles according to cluster models
    • Abstract: Abstract Computer-implemented cluster models have been devised for ∼2-nm anatase nanoparticles with exposed (001) and (100) faces. The Lewis acid sites occurring in these faces have been characterized by calculating the enthalpy of CO adsorption. In the Ti114O228 and Ti187O376H4 clusters, the corner oxygen atoms compensating the electric charge are bound to titanium atoms by double bonds with a length of approximately 1.7 Å, which is in agreement with experimental data. The average enthalpy of CO adsorption on the (001) and (100) faces at a zero coverage is −87.62 and −135.31 kJ/mol, respectively. The deviation from the average value is 20.2 and 8.8%, respectively. The average enthalpy of CO adsorption for the Ti114O228 cluster is −129.40 kJ/mol, and that for the Ti187O376H4 cluster is −119.79 kJ/mol.
      PubDate: 2014-07-01
       
  • Catalytic properties of CoMo/Al       class="a-plus-plus">2O       class="a-plus-plus">3 sulfide catalysts in the
           hydrorefining of straight-run diesel fraction mixed with rapeseed oil
    • Abstract: Abstract CoMo/Al2O3 sulfide catalysts varying in preparation method and Co/Mo ratio have been tested in the hydrorefining of a mixture of straight-run diesel fraction and rapeseed oil in a flow reactor at a temperature of 340–360°C, a hydrogen pressure of 4.0–7.0 MPa, and a liquid hourly space velocity of 1–2 h−1. A comparison between catalysts prepared using citric acid (CoMo/Al2O3-1.5) and both citric and orthophosphoric acids (CoMoP/Al2O3-1.5) as promoters, with Co/Mo = 0.3 and 0.5, has demonstrated that the most active catalyst in hydrodesulfurization and hydrodenitrogenation is the phosphorus-containing Co/Mo ≈ 0.5 sample. The addition of rapeseed oil to straight-run diesel fraction lowers the hydrodesulfurization and hydrodenitrogenation activities of the CoMo sulfide catalysts, irrespective of the method by which they were prepared. The fatty acid triglyceride conversion selectivity of these catalysts depends on the Co/Mo ratio and on reaction conditions: decreasing the Co/Mo ratio from 0.46 to 0.26, lowering the reaction temperature, and raising the hydrogen pressure and hydrogen-to-feedstock ratio increase the C18/C17 hydrocarbon ratio in the hydrogenated product. The addition of rapeseed oil improves the quality of the product; however, for attaining the preset residual sulfur level in this case, the process needs to be conducted at a higher temperature than the hydrorefining of straight-run diesel fraction containing no admixture.
      PubDate: 2014-07-01
       
  • Kinetics of the liquid-phase catalytic hydrogenation of
           chlorine-containing aromatic nitro compounds in the presence of pyridine
    • Abstract: Abstract We have analyzed experimental kinetic data for nitro compound consumption, for the formation of the corresponding amino product, and for the accumulation of intermediate products and by-products in the hydrogenation of chlorine-containing aromatic nitro compounds. The reaction has been carried out under static conditions over a platinum catalyst on a porous support in the presence of pyridine. The effect of the admixture on different hydrogenation steps of a chlorine-containing aromatic nitro compound has been quantitatively interpreted.
      PubDate: 2014-07-01
       
  • Decomposition and oxidation of methanol on platinum: A study by in situ
           X-ray photoelectron spectroscopy and mass spectrometry
    • Abstract: Abstract The reactions of the catalytic oxidation and decomposition of methanol on the atomically smooth and high-defect Pt(111) single-crystal surfaces were studied using in situ temperature-programmed reaction and X-ray photoelectron spectroscopy. It was found that the decomposition of methanol on both of the surfaces occurred via two reaction pathways: complete dehydrogenation to CO and decomposition with the C-O bond cleavage. Although the rate of reaction via the latter pathway was lower than the rate of dehydrogenation by three orders of magnitude, the carbon formed as a result of the C-O bond cleavage can be accumulated on the surface of platinum to prevent the further course of the reaction. It was shown that oxygen exhibits high activity toward the formed carbon deposits. As a result, the rate of methanol conversion in the presence of oxygen in a gas phase increased by one or two orders of magnitude; in this case, CO2 and water appeared in the composition of the reaction products as a result of the oxidation of CO and hydrogen, respectively. The high-defect surface of platinum was more active in the reactions of methanol decomposition and oxidation than the atomically smooth Pt(111) single-crystal surface. On the former, selectivity for the formation of methanol dehydrogenation products in oxygen deficiency was higher than on the latter. The main reaction pathways of the decomposition and oxidation of methanol on platinum were considered.
      PubDate: 2014-07-01
       
  • Ethylene oxidation under conditions of the oxidative coupling of methane
    • Abstract: Abstract Ethylene conversion under conditions of the oxidative coupling of methane has been investigated. In an empty reactor above 740°C, ethylene oxidation occurs at a higher rate and its main product is carbon monoxide. Filling the reactor with an inert material (quartz) or a NaWMn/SiO2 catalyst leads to a marked decrease in the ethylene conversion rate. Addition of methane to the reaction mixture dramatically slows down ethylene conversion rate and increases the C3 hydrocarbon content of the reaction products. The kinetics of ethylene oxidation in the presence of methane over the NaWMn/SiO2 catalyst is reported.
      PubDate: 2014-07-01
       
  • Products distribution of glycerol hydrogenolysis over supported co
           catalysts in a liquid phase
    • Abstract: Abstract The products distribution of glycerol hydrogenolysis over supported Co catalysts was evaluated in a liquid phase system. The effects of support type, temperature, pressure and reaction time on the conversion of glycerol as well as yield of desired products were investigated. The preliminary results indicated that various added compounds were generated in the presence of supported Co catalysts. The type of support and the reaction temperature, pressure and time significantly affected either the glycerol conversion or the product yield. The acidity of catalyst played a more important role in the glycerol hydrogenolysis over supported Co catalysts than the specific surface and pore volume. Among the utilized supported Co catalysts, Co/γ-Al2O3 exhibited the highest acrolein yield of about 31.1% at 70.5% conversion at 200°C, 8 MPa H2 pressure and 6 h reaction time.
      PubDate: 2014-07-01
       
  • Thermal decomposition mechanism of dimethyl(acetylacetonato)gold(III):
           Quantum chemical modeling
    • Abstract: Abstract Different mechanisms of the thermal decomposition of the complex [(CH3)2Au(acac)] and the subsequent formation of Au particles are considered using density functional theory. The first decomposition step is the intramolecular reductive elimination of the methyl groups yielding ethane and the complex [Au(acac)], which dimerizes into the dinuclear complex [Au2(acac)2] with an energy gain. The presence of the coordinatively unsaturated center [Au(acac)] results in a considerable decrease in the activation energy of decomposition of the complex [(CH3)2Au(acac)]. The [Au2(acac)2] dimer undergoes association, again with an energy gain, to form linear polymer chains with short Au-Au bonds, which act as the nanoparticle nucleation centers.
      PubDate: 2014-07-01
       
  • Ring-opening polymerization by N-heterocyclic carbenes as catalysts:
           Characteristics and kinetics
    • Abstract: Abstract In this work catalytic ring-opening polymerization of cyclic esters in THF in the presence of benzyl alcohol is described. The polymerization is catalyzed by 1,3-bis(4-methoxyphenyl)imidazolium carbene, N-heterocyclic carbene (NHC). The ability of two different monomers, ɛ-caprolactone and L-lactide, to enter into the polymerization via ring-opening polymerization with NHCs as catalysts was evaluated. The plot of ln([M]0/[M]t) versus reaction time yielded a straight line indicating that the kinetics of polymerization of ɛ-caprolactone and L-lactide was first-order in monomer concentration. Moreover, a direct relation between the rate of ring-opening polymerization of ɛ-caprolactone and the catalyst concentration suggested a first-order dependence of the rate of polymerization on the catalyst concentration.
      PubDate: 2014-07-01
       
  • Role of anionic impurities in the formation of the active state of
           catalysts based on transition metals
    • Abstract: Abstract Experimental data concerning the structure of transition metal-based catalysts are analyzed. Anionic impurities in the oxide precursor markedly modify both its structure and the structure of the catalyst resulting from its reduction. The modifying anionic impurities exert a significant effect on the local environment of the transition metal cations (particularly on that of Jahn-Teller cations) and even on the very possibility of existence of a mixed oxide precursor. In some cases, the changes in the local environment of the cations under the action of modifying ions show themselves as radical changes in the catalyst reduction kinetics. The formation of epitaxial bonding between the particles of the active metal and the surface of the oxide support, as well as the decoration of the particles with an amorphous oxyhydroxide layer, can be favorable for the stabilization of the active metal particles in the reduced state. Presumably, the activation of hydrogen molecules and the substrate being hydrogenated (e.g., CO) occurs on the surface of metal particles completely covered by a thin layer of the amorphous oxyhydroxide. The experimentally observed high activity of these catalysts is unlikely to be solely due to the increase in the specific catalytic activity of the remaining uncovered surface of the metal. It should also be attributed to the high inherent catalytic activity of the metal particles decorated with the oxyhydroxide layer.
      PubDate: 2014-07-01
       
  • Effect of doping a cadmium sulfide-zinc sulfide solid solution with copper
           ions on its physicochemical properties and catalytic activity in hydrogen
           recovery from aqueous solutions under the action of visible radiation
    • Abstract: Abstract Cu y Cd0.3Zn0.7S1 + y photocatalysts intended for hydrogen recovery from aqueous solution under the action of visible radiation have been synthesized and characterized. The effect of the pH of the aqueous solution of Na2S-Na2SO3 on the rate of the photocatalytic reaction has been investigated. The highest activity is shown by the sample containing 1 mol % copper. With this photocatalyst, the quantum efficiency of the reaction under optimum conditions is 23.5%.
      PubDate: 2014-07-01
       
  • Activity of Au, Ni, and Au-Ni catalysts in the water-gas shift reaction
           and carbon monoxide oxidation
    • Abstract: Abstract Au/Al2O3, NiO x /Al2O3, and (Au + NiO x )/Al2O3 composites have been prepared by ion exchange and impregnation. Their structural and electronic properties, including the size and shape of supported metal particles and the oxidation state and ligand environment of the Au and Ni atoms, have been investigated. The catalytic action of Au/Al2O3, NiO x /Al2O3, and (Au + NiO x )/Al2O3 in the water-gas shift reaction and carbon monoxide oxidation is reported. At 300–450°C, the CO conversion over (Au + NiO x )/Al2O3 exceeds the sum of the CO conversions over the monometallic catalysts Au/Al2O3 and NiO x /Al2O3 by a factor of 2–3. An explanation is suggested for the nonadditive increase in the CO conversion over the Au-Ni catalysts.
      PubDate: 2014-05-01
       
  • Carbon deposits on a resistive FeCrAl catalyst for the suboxidative
           pyrolysis of methane
    • Abstract: Abstract The carbon deposits forming upon the suboxidative pyrolysis of methane on resistive FeCrAl catalysts heated with electric current were studied. The suboxidative pyrolysis of methane was carried out in a flow reactor at the ratio CH4: O2 = 15: 1 in a catalyst-coil temperature range of 600–1200°C; a cold reaction mixture (∼20°C) was supplied. The morphology and structure of the carbon deposits and changes in the composition and structure of the catalyst were characterized by scanning electron microscopy, transmission electron microscopy with EDX analysis, Raman spectroscopy, and X-ray diffraction analysis. Various forms of carbon deposits, including branched nanotubes, and metal carbides formed by catalyst constituents were detected. It was found that the carbon deposits on the catalyst surface were morphologically different from the deposits on quartz reactor walls. The reasons for these differences were considered.
      PubDate: 2014-05-01
       
 
 
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