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  Subjects -> CHEMISTRY (Total: 814 journals)
    - ANALYTICAL CHEMISTRY (49 journals)
    - CHEMISTRY (566 journals)
    - CRYSTALLOGRAPHY (22 journals)
    - ELECTROCHEMISTRY (25 journals)
    - INORGANIC CHEMISTRY (41 journals)
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    - PHYSICAL CHEMISTRY (65 journals)

CHEMISTRY (566 journals)            First | 1 2 3 4 5 6 | Last

Journal of Chemical Sciences     Partially Free   (Followers: 16)
Journal of Chemical Theory and Computation     Full-text available via subscription   (Followers: 11)
Journal of Cheminformatics     Open Access   (Followers: 1)
Journal of Chemistry     Open Access   (Followers: 3)
Journal of Chemometrics     Hybrid Journal   (Followers: 10)
Journal of Chromatography A     Hybrid Journal   (Followers: 48)
Journal of Chromatography Library     Full-text available via subscription   (Followers: 5)
Journal of Colloid and Interface Science     Hybrid Journal   (Followers: 13)
Journal of Computational Chemistry     Hybrid Journal   (Followers: 14)
Journal of Coordination Chemistry     Hybrid Journal   (Followers: 1)
Journal of Dispersion Science and Technology     Hybrid Journal  
Journal of Encapsulation and Adsorption Sciences     Open Access   (Followers: 5)
Journal of Environmental Chemistry and Ecotoxicology     Open Access   (Followers: 2)
Journal of Flow Chemistry     Full-text available via subscription   (Followers: 1)
Journal of Fluorescence     Hybrid Journal   (Followers: 3)
Journal of Fluorine Chemistry     Hybrid Journal   (Followers: 6)
Journal of Fuel Chemistry and Technology     Full-text available via subscription   (Followers: 5)
Journal of Great Lakes Research     Hybrid Journal   (Followers: 7)
Journal of Heterocyclic Chemistry     Hybrid Journal   (Followers: 5)
Journal of Immunoassay and Immunochemistry     Hybrid Journal   (Followers: 3)
Journal of Inclusion Phenomena and Macrocyclic Chemistry     Hybrid Journal   (Followers: 1)
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: 19)
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 Physics and Chemistry     Open Access  
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: 245)
Journal of Membrane and Separation Technology     Hybrid Journal  
Journal of Membrane Science     Hybrid Journal   (Followers: 11)
Journal of Modern Chemistry & Chemical Technology     Full-text available via subscription   (Followers: 2)
Journal of Molecular Catalysis A: Chemical     Hybrid Journal   (Followers: 3)
Journal of Molecular Graphics and Modelling     Hybrid Journal   (Followers: 4)
Journal of Molecular Liquids     Hybrid Journal   (Followers: 2)
Journal of Molecular Modeling     Hybrid Journal   (Followers: 3)
Journal of Molecular Recognition     Hybrid Journal   (Followers: 2)
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: 4)
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: 1)
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: 3)
Journal of Polymer & Composites     Full-text available via subscription  
Journal of Polymer and Biopolymer Physics Chemistry     Open Access   (Followers: 1)
Journal of Polymer Science Part A: Polymer Chemistry     Hybrid Journal   (Followers: 212)
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   (Followers: 1)
Journal of Raman Spectroscopy     Hybrid Journal   (Followers: 11)
Journal of Research Updates in Polymer Science     Hybrid Journal  
Journal of Saudi Chemical Society     Open Access  
Journal of Solid State Chemistry     Hybrid Journal   (Followers: 14)
Journal of Solution Chemistry     Hybrid Journal   (Followers: 4)
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: 320)
Journal of the American Society for Mass Spectrometry     Hybrid Journal   (Followers: 17)
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: 8)
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: 39)
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: 5)
Macromolecular Rapid Communications     Hybrid Journal   (Followers: 5)
Macromolecular Research     Hybrid Journal  
Macromolecular Symposia     Hybrid Journal  
Macromolecular Theory and Simulations     Hybrid Journal  
Macromolecules     Full-text available via subscription   (Followers: 33)
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  

  First | 1 2 3 4 5 6 | Last

Journal Cover   Kinetics and Catalysis
  [SJR: 0.25]   [H-I: 19]   [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  [2300 journals]
  • Direct oxidation of hydrogen sulfide over vanadium catalysts: I. Kinetics
           of the reaction
    • Abstract: Abstract The kinetics of H2S oxidation with atmospheric oxygen over V2O5 has been investigated at temperatures of 150–250°C, O2: H2S > 4 mol/mol, and initial H2S concentrations of up to 3 vol %. In spite of the large excess of oxygen over hydrogen sulfide, the H2S conversion rate depends on the oxygen concentration and does not depend on the hydrogen sulfide concentration. The temperature dependence of the H2S conversion rate differs markedly from the Arrhenius dependence and is nearly linear. The SO2 formation rate obeys the Arrhenius equation. The mechanism suggested for hydrogen sulfide oxidation includes SO2 and liquid sulfur formation steps and the interaction between H2S and SO2 in a liquid sulfur film. Reaction rates have been calculated for this reaction mechanism. The calculated rates coincide with experimental data. Numerical values of rate constants have been obtained for the liquid-phase interaction between H2S and SO2.
      PubDate: 2015-01-01
       
  • Effect of metal-support interaction in the M/Ce 0.72 Zr 0.18 Pr 0.1 O 2 (M
           = Ru, Pd, and Pt) catalysts and their activity in CO and CH 4 oxidation
    • Abstract: Abstract The study of catalysts based on a Ce0.72Zr0.18Pr0.1O2 solid solution with Pt, Pd, and Ru supported from acetylacetonate precursors showed their high activity in the processes of CO and methane oxidation. Transmission electron microscopy, X-ray absorption spectroscopy, and X-ray photoelectron spectroscopy were used for determining the nature of the active sites of the catalysts. The metal-support interaction effect, which increased in the order Ru < Pd < Pt, was found, and a relationship between the intensity of this interaction and the catalytic action was established.
      PubDate: 2015-01-01
       
  • Effect of the n -butanol addition on cyclopentadienyl radical formation
           during benzene combustion
    • Abstract: Abstract The PREMIX code in conjunction with Chemkin II and models resulting from the merging of validated kinetic schemes describing the oxidation of the components of the n-butanol-benzene mixtures were used to investigate the effect of n-butanol addition on the formation-depletion of cyclopehtadienyl radical (C5H5), a soot precursor in the flames of mixtures of n-butanol-benzene formed under fuel-rich conditions. The first part of this study deals with the validation of the proposed combined model on benzene and n-butanol flames. The second part describes the dependence of the amount of cyclopentadienyl radical on the percentage of benzene replacement by oxygenate additive. The third part deals with the causes of the variation of mole fractions of this species with n-butanol. The principal objective of this work was to obtain fundamental understanding of the mechanisms through which an oxygenate affects amounts of C5H5. It was found that the cyclopentadienyl radical concentration was lower in the flame of the n-butanol-benzene fuel mixture than in the pure benzene flame.
      PubDate: 2015-01-01
       
  • Cyclic mechanisms of chain termination on nitroxyl radicals in oxidized
           polymers and hydrocarbons
    • Abstract: A kinetic analysis of published schemes for cyclic chain termination on piperidineoxyl radicals in oxidized polymers is carried out. None of the earlier proposed schemes explains the experimentally observed fast regeneration of the nitroxyl radical from hydroxamic ester that ensures the efficient chain termination in the experiment. A new scheme is proposed for the cyclic mechanism of chain termination on nitroxyl radicals in oxidized hydrocarbons and polymers. The scheme is consistent with experimental data. The exothermic hydrogen atom abstraction reaction between the peroxyl radical and hydroxamic ester with the concerted fragmentation of the molecule occupies the central place in this cyclic mechanism. An algorithm is proposed for the calculation of enthalpies, activation energies, and rate constants of these reactions.
      PubDate: 2015-01-01
       
  • Oxidation of co with catalyst oxygen and with oxygen from the gas phase
           over CuO/CeO 2 according to TPD and IR spectroscopic data
    • Abstract: Abstract The forms of CO adsorption on the 5 and 10% CuO/CeO2 samples were studied by temperature-programmed desorption and IR spectroscopy. It was established that CO forms bridging and mono- and bidentate carbonate complexes on CuO clusters at 20°C; these complexes are decomposed with the desorption of CO2 at T max = 160 and 240–350°C, respectively. The Cu+ cations, on which Cu+-CO carbonyls are formed, are produced simultaneously with carbonates. They are decomposed at 110°C in a vacuum with the desorption of CO and oxidized at 20°C in an atmosphere of oxygen to form bridging carbonates. These latter are decomposed in a range of 20–150°C with the release of CO2. Adsorbed oxygen decreases the decomposition temperature of the carbonates formed upon the adsorption of CO by 50°C and keeps the sample in an oxidized state, which is active with respect to the subsequent adsorption and oxidation of CO. The oxidation of CO by the catalyst oxygen decreases the activity of the sample in these processes and increases the thermal stability of carbonate complexes. Based on the properties of the adsorption complexes of CO, a conclusion was made that the bridging carbonates participate in the reaction of carbon monoxide oxidation by the catalyst oxygen and oxygen from a gas phase in a range of 20–150°C. The decomposition of the carbonates with an activation energy of 64 kJ/mol is the rate-limiting step.
      PubDate: 2015-01-01
       
  • Role of the chemical mechanism in the temperature dependence of the rate
           of gas combustion reactions
    • Abstract: Abstract The determining role of the kinetic mechanism in the temperature dependence of reaction rates is demonstrated. New evidence is presented to prove that the branched chain nature of gas combustion at low pressures and under isothermal conditions, discovered by N.N. Semenov, persists in combustion processes at elevated pressures under any temperature and macrokinetic conditions. It is noted that the temperature dependence of the rate constants of bimolecular reactions weakens with an increasing activation energy.
      PubDate: 2015-01-01
       
  • Soot formation during the pyrolysis and oxidation of acetylene and
           ethylene in shock waves
    • Abstract: Abstract Experimental and computational studies of soot formation during the pyrolysis and oxidative pyrolysis of hydrocarbons with multiple bonds have been performed on ethylene and acetylene as examples. The experiments have been carried out behind reflected shock waves over the temperature range from 1700 to 2800 K at a pressure of 3 to 5 bar. The process of soot formation was recorded using the absorption-emission method, which enables one to simultaneously measure the mass of soot particles per unit volume and their temperature. The experimental data are interpreted within a new kinetic mechanism that takes into account the nucleation of soot particles from both polyaromatic hydrocarbon fragments and unsaturated aliphatic hydrocarbons. The proposed kinetic model of soot formation closely reproduces the time dependence of the soot yield and the temperature of soot particles measured in the present work, as well as the concentrations of several key components formed in the early stages of pyrolysis and oxidation of acetylene and ethylene, reported in a number of works by other authors.
      PubDate: 2015-01-01
       
  • Kinetics of reactions of antioxidants from some food and medicinal plants
           with the stable radical 2,2-diphenyl-1-picrylhydrazyl
    • Abstract: Abstract The run of kinetic curves and the changes in the rate of the reaction of the stable radical 2,2-diphenyl-1-picrylhydrazyl with antioxidants present in extracts from some food and medicinal plants and with some individual natural phenolic antioxidants in ethanol have been investigated spectrophotometrically at different hydrogen chloride concentrations. The contributions from different mechanisms to the kinetics of these processes have been evaluated. The choice of optimal hydrogen chloride concentrations facilitating a comparison of the kinetic parameters obtained for various objects (3–10 mmol/L) has been substantiated. Comparative antiradical activity has been measured for complex samples obtained from food and medicinal plants.
      PubDate: 2015-01-01
       
  • Kinetics of tetracene oxidation with singlet molecular oxygen: Dependence
           on the physicochemical properties of the solvent
    • Abstract: Abstract The photosensitized oxidation of tetracene with singlet molecular oxygen in organic and aqueous-organic solvents has been investigated. Bimolecular rate constants of the reaction have been measured. The kinetic effect of a solvent is determined by its dielectric properties and electron affinity.
      PubDate: 2015-01-01
       
  • Mechanism of the first step of ozone addition to halogen-substituted
           ethylenes
    • Abstract: Abstract Quantum chemical calculations have been carried out for the ozonolysis of monofluoro-, monochloro-, 1,1-difluoro-, and 1,1-dichloroethylene using the aug-cc-pVDZ basis set by the B2PLYP (B2LYP-D) double-hybrid method involving the Møller-Plesset perturbation theory, the CASSCF multiconfigurational ab initio method with MRMP2 corrections, and the CCSD coupled cluster method. The mechanisms of concerted (Criegee) and nonconcerted (DeMore) additions have been investigated. The CCSD method more precisely simulates these reactions. With the MRMP2 method, the overall reaction rate constant is underestimated because of incomplete geometry optimization, but on the whole the dependence of the rate constant on the nature and number of substituents is practically identical to the dependence predicted by the two other methods. Polar substituents in the molecule increase the contribution from the nonconcerted addition mechanism, which reaches 50% for 1,1-difluoroethylene and 98% for 1,1-dischloroethylene.
      PubDate: 2015-01-01
       
  • Effect of metallocenes on benzoyl peroxide decomposition
    • Abstract: Abstract Benzoyl peroxide (BP) decomposition in the presence of the Cp2Fe, (C5Me5)2Fe, (C5Me5)2ZrCl2, (AcC5H4)(C5H4)Fe, Cp2ZrCl2, and Cp2TiCl2 metallocenes in ethylbenzene oxidation as a model reaction has been studied. It has been shown that the metallocenes have a catalytic effect on BP decomposition in accordance with their electrochemical potentials. The rate constant of the bimolecular BP decomposition reaction with the formation of radicals in the BP-ferrocene system (1.46 L mol−1 s−1) has been found.
      PubDate: 2015-01-01
       
  • Transformation of aqueous solutions of glucose over the Pt/C catalyst
    • Abstract: Abstract The transformations of glucose over the Pt/C catalyst in a flow reactor in the temperature range 140–200°C at a pressure of 5.0 MPa have been studied. The main routes of glucose conversion in an aqueous phase in the presence of hydrogen, helium, or air have been considered. A product formation scheme depending on the reaction parameters has been proposed. At 140°C, glucose hydrogenation into sorbitol occurs with a selectivity of 77%. In an oxidizing atmosphere, glucose transforms into gluconic acid (with 73% selectivity at 140°C); here, the formation of sorbitol and mannitol (with a selectivity of 5–7% at 180–200°C) is also possible. Glucose transformation by-products, such as C3–C5 polyatomic alcohols, ketones, acids, and furfural derivatives, have been identified. The degree of glucose reforming in the aqueous solution with the formation of the gaseous products H2 and CO2 is no higher than 10% at 200°C.
      PubDate: 2015-01-01
       
  • Deactivation of a Zn-Containing zeolite in ethane aromatization
    • Abstract: Abstract Ethane conversion into aromatic hydrocarbons over a high-silica ZSM-5-type zeolite doped with zinc by impregnation has been investigated. The deactivation of the Zn-containing zeolite at different stages of ethane conversion has been studied by temperature-programmed ammonia desorption, differential thermal analysis, high-resolution transmission electron microscopy, and energy-dispersive X-ray spectroscopy. The nature and distribution of active phases and coke deposits on the catalyst surface have been determined. The Zn/ZSM-5 catalyst shows a relatively high activity and stable performance in ethane aromatization.
      PubDate: 2014-11-01
       
  • Influences of organic compounds on the visible light induced
           photocatalytic reduction of Cr(VI)
    • Abstract: Abstract The objective of this work is to study how the nature of organic compounds influences on the reduction of Cr(VI). The photocatalytic reduction of Cr(VI) was carried out in the presence of various organic compounds under visible light, a remarkable promotion effect on Cr(VI) reduction was observed in most cases. The results indicate that the electronic and structural characteristics of different organics are important factors for the reduction of Cr(VI). A suitable redox potential was important for the organic compounds to promote the reduction. Organic compounds with the electronic property of conjugative effect indicated promotion effect, while indicated inhibition effect with inductive effect. The chelating agents served not only as the electron donors, but also formed complexes with Cr(VI) and/or its reduction products.
      PubDate: 2014-11-01
       
  • State and properties of ion-exchanged cations in zeolites: 2. IR spectra
           and chemical activation of adsorbed methane
    • Abstract: Abstract Methane adsorption by hydrogen and cationic forms of various zeolites has been investigated by diffuse reflectance IR spectroscopy. In methane adsorption on faujasites, protons, univalent alkali metal cations, and divalent alkaline-earth cations exert similar perturbation and polarization effects on the methane molecule. Adsorbed methane in high-silica zeolites is perturbed by alkaline-earth cations somewhat more strongly than in faujasites and still more strongly by divalent transition metal cations. In the latter case, as in hydrogen adsorption, which was considered in the previous report, the interaction between methane and the zinc form of zeolite ZSM-5 at elevated temperatures causes the heterolytic dissociative adsorption of methane with the formation of methyl fragments and acidic hydroxyl groups bound to zinc ions.
      PubDate: 2014-11-01
       
  • Kinetics and mechanism of the interaction between HAuCl 4 and rutin
    • Abstract: Abstract The kinetics and mechanism of the reaction of HAuCl4 with rutin and the size of the resulting gold nanoparticles have been studied by UV-vis, FTIR, and surface-enhanced Raman spectroscopy (SERS), atomic force microscopy (AFM) and small-angle X-ray scattering (SAXS). The reaction includes the formation of a rutin complex with HAuCl4 and its decomposition yielding Au atoms. The gold nanoparticles result from Au ions and atoms at the second stage. This stage can be described in terms of a second order kinetic equation. The rate constant and Gibbs energy of the second stage of nanoparticle formation have been determined.
      PubDate: 2014-11-01
       
  • Acetylene hydrochlorination over mechanically activated K 2 MCl 4 (M = Pt,
           Pd) and K 2 PtCl 6 catalysts: The HCl/DCl kinetic isotope effect and
           reaction mechanisms
    • Abstract: Abstract It is demonstrated that HCl molecules participate in two steps of acetylene hydrochlorination with gaseous HCl over mechanically activated K2MCl4 (M = Pt or Pd) and K2PtCl6 catalysts, namely, the hydrochlorination of π-coordinated acetylene (rate-limiting step) and protodemetallation. It is confirmed that the same intermediate—β-chlorovinyl derivative of Pt(II)—is involved in protodemetallation over the Pt-containing catalysts. Possible mechanisms of the two reaction steps are considered.
      PubDate: 2014-11-01
       
  • Template synthesis of titanium dioxide coatings and determination of their
           photocatalytic activity by aqueous oxidation of humic acid
    • Abstract: Abstract In this work, aqueous photocatalytic oxidation of humic acid, present in various waters as naturally occurring compound or anthropogenic pollutant, was studied using self-synthesized titanium dioxide coatings. To obtain the latter, template synthesis, widely used for the production of photocatalysts with improved surface properties and activity, was applied with variations in template material, N-cetyl-N,N,N-trimethylammonium bromide content. The catalysts were characterized using XRD, UV-VIS spectroscopy, and SEM. The activity of TiO2 coatings in the degradation of humic acid proved to be superior to that of commercial photocatalyst P25 (Evonik) The dependence of the photocatalysts’ performance on the template content in the synthesis precursors, which was responsible for the various surface features of the coatings, was established and explained.
      PubDate: 2014-11-01
       
  • The effect of catalyst preparation on the activity of MoO 3 -SiO 2
           catalyst in transesterification of diethyl oxalate
    • Abstract: Abstract Transesterification of diethyl oxalate (DEO) with phenol over MoO3-SiO2 catalysts prepared by the sol-gel technique (MoO3-SiO2 (SG)) and the impregnation method (MoO3-SiO2 (I)) was conducted to produce diphenyl oxalate (DPO), which can be used as a precursor for manufacturing diphenyl carbonate (DPC). The sample MoO3-SiO2 (SG) containing 12 wt % of MoO3 showed the best performance with 71.0% conversion of DEO and 32.0% selectivity to DPO. Compared to MoO3-SiO2 (I), improvements in the DEO conversion and DPO selectivity with MoO3-SiO2 (SG) were 16.1 and 7%, respectively. Crystal structure and phase composition of MoO3-SiO2 (I) and MoO3-SiO2 (SG) catalysts with varying MoO3 contents were investigated. The sample MoO3-SiO2 (SG) with a similar chemical composition to MoO3-SiO2 (I) has a larger specific surface area, indicating that the active component is well dispersed on the surface of the MoO3-SiO2 (SG) catalysts. Results of XRD and XPS measurements suggest a high degree of dispersion of MoO3-SiO2 (SG) catalysts that can account for an increase in DEO conversion and DPO selectivity. Coordinately unsaturated MoO3 species play a significant role in the catalytic performance of MoO3-SiO2 (SG) catalysts in transesterification of DEO with phenol. In addition, IR measurements of pyridine adsorption and NH3-TPD data indicate that the amount of acid sites on the surface of MoO3-SiO2 (SG) exceeds that found for the surface of MoO3-SiO2 (I). An enhanced concentration of surface MoO3 species in tetrahedral coordination coupled with the presence of weak Lewis acid sites appear to be the main reason why MoO3-SiO2 (SG) catalysts are superior to the MoO3-SiO2 (I) system.
      PubDate: 2014-11-01
       
  • Formation of platinum sites on layered double hydroxide type basic
           supports: III. Effect of the mechanism of [PtCl 6 ] 2− complex
           binding to aluminum-magnesium layered double hydroxides on the properties
           of supported platinum in Pt/MgAlO x catalysts
    • Abstract: Abstract While synthesizing platinum catalysts supported on aluminum-magnesium oxides (Pt/MgAlO x ), we established that, in the binding of the Pt(IV) chloro complex to aluminum-magnesium layered double hydroxides (LDHs), the mechanism of the metal complex-support interaction depends on the nature of the interlayer anion of the LDH. The synthesis may yield chemically identical Pt/MgAlO x samples differing in the particle size and electronic structure of supported platinum. The higher dehydrogenating activity of the catalyst obtained by binding the [PtCl6]2− complex in the interlayer space of LDH via exchange with interlayer OH− anions is possibly due to the larger proportion of metallic platinum (Pt0) in this catalyst. In the catalyst prepared from hydrolyzed platinum complex species using LDH with CO 3 2− interlayer anions, platinum is mainly in an oxidized state similar to Pt2+.
      PubDate: 2014-11-01
       
 
 
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