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 Subjects -> CHEMISTRY (Total: 773 journals)     - ANALYTICAL CHEMISTRY (45 journals)    - CHEMISTRY (537 journals)    - CRYSTALLOGRAPHY (22 journals)    - ELECTROCHEMISTRY (24 journals)    - INORGANIC CHEMISTRY (40 journals)    - ORGANIC CHEMISTRY (41 journals)    - PHYSICAL CHEMISTRY (64 journals) CHEMISTRY (537 journals)            First | 1 2 3 4 5 6 | Last
 Journal of Fuel Chemistry and Technology       (Followers: 5) Journal of Great Lakes Research       (Followers: 7) Journal of Heterocyclic Chemistry       (Followers: 5) Journal of Immunoassay and Immunochemistry       (Followers: 3) Journal of Inclusion Phenomena and Macrocyclic Chemistry       (Followers: 2) Journal of Inorganic Biochemistry       (Followers: 2) Journal of Labelled Compounds and Radiopharmaceuticals       (Followers: 1) Journal of Macromolecular Science, Part A: Pure and Applied Chemistry       (Followers: 4) Journal of Mass Spectrometry       (Followers: 20) Journal of Materials Chemistry A : Materials for Energy and Sustainability       (Followers: 23) Journal of Materials Chemistry B : Materials for Biology and Medicine       (Followers: 5) Journal of Materials Chemistry C : Materials for Optical, Magnetic and Electronic Devices       (Followers: 6) Journal of Materials Research       (Followers: 9) Journal of Mathematical Chemistry       (Followers: 4) Journal of Medicinal Chemistry       (Followers: 179) Journal of Membrane Science       (Followers: 10) Journal of Modern Chemistry & Chemical Technology       (Followers: 2) Journal of Molecular Catalysis A: Chemical       (Followers: 2) Journal of Molecular Graphics and Modelling       (Followers: 4) Journal of Molecular Liquids       (Followers: 3) Journal of Molecular Modeling       (Followers: 3) Journal of Molecular Recognition       (Followers: 2) Journal of Molecular Spectroscopy       (Followers: 6) Journal of Molecular Structure       (Followers: 3) Journal of Nanoparticles Journal of Nanostructure in Chemistry       (Followers: 5) Journal of Natural Gas Chemistry       (Followers: 2) Journal of Nepal Chemical Society Journal of Nucleic Acids Investigation       (Followers: 2) Journal of Ocean University of China (English Edition)       (Followers: 2) Journal of Organometallic Chemistry       (Followers: 12) Journal of Photochemistry and Photobiology A: Chemistry       (Followers: 4) Journal of Photochemistry and Photobiology C: Photochemistry Reviews       (Followers: 4) Journal of Polymer Science Part A: Polymer Chemistry       (Followers: 171) Journal of Polymers       (Followers: 1) Journal of Porphyrins and Phthalocyanines       (Followers: 2) Journal of Pure and Applied Chemistry Research       (Followers: 1) Journal of Raman Spectroscopy       (Followers: 10) Journal of Saudi Chemical Society Journal of Solid State Chemistry       (Followers: 13) Journal of Solution Chemistry Journal of Structural Chemistry Journal of Sulfur Chemistry       (Followers: 2) Journal of Superhard Materials       (Followers: 1) Journal of Surfactants and Detergents       (Followers: 5) Journal of Systems Chemistry       (Followers: 1) Journal of Taibah University for Science Journal of the American Chemical Society       (Followers: 263) Journal of the American Society for Mass Spectrometry       (Followers: 17) Journal of the American Society of Brewing Chemists       (Followers: 1) Journal of the Bangladesh Chemical Society Journal of the Chilean Chemical Society       (Followers: 2) Journal of the Iranian Chemical Society       (Followers: 1) Journal of the Korean Society for Applied Biological Chemistry       (Followers: 1) Journal of the Mexican Chemical Society       (Followers: 1) Journal of Theoretical and Computational Chemistry       (Followers: 7) Journal of Theoretical Chemistry Journal of Wood Chemistry and Technology       (Followers: 7) JPC - Journal of Planar Chromatography - Modern TLC       (Followers: 6) Jurnal Penelitian Sains (JPS) Jurnal Teknologi Informasi       (Followers: 3) Kinetics and Catalysis       (Followers: 3) Korea-Australia Rheology Journal Langmuir       (Followers: 35) Latvian Journal of Chemistry       (Followers: 1) Lebensmittelchemie       (Followers: 1) Lipid Insights       (Followers: 1) Luminescence       (Followers: 1) Macromolecular Materials & Engineering       (Followers: 4) Macromolecular Rapid Communications       (Followers: 4) Macromolecular Research Macromolecular Symposia Macromolecular Theory and Simulations Macromolecules       (Followers: 31) Magnetic Resonance in Chemistry       (Followers: 4) Main Group Chemistry Marine Chemistry       (Followers: 4) Marine Drugs       (Followers: 4) MATEC Web of Conferences Materials Characterization       (Followers: 22) Materials Horizons Materials Research Bulletin       (Followers: 16) Materials Science Monographs       (Followers: 1) Materials Science-Poland Materials Sciences and Applications       (Followers: 4) MedChemComm       (Followers: 4) Medicinal Chemistry Research       (Followers: 10) Metallography, Microstructure, and Analysis       (Followers: 2) Metallomics Micro and Nano Systems Letters       (Followers: 2) Microchimica Acta       (Followers: 2) Microporous and Mesoporous Materials       (Followers: 3) Modern Research in Catalysis       (Followers: 2) Molbank Molecules       (Followers: 3) Molecules and Cells       (Followers: 1) Monatshefte für Chemie - Chemical Monthly       (Followers: 3) Mongolian Journal of Chemistry Moroccan Journal of Chemistry Moscow University Chemistry Bulletin       (Followers: 2)
 Kinetics and Catalysis    [5 followers]  Follow        Hybrid journal (It can contain Open Access articles)      ISSN (Print) 1608-3210 - ISSN (Online) 0023-1584      Published by Springer-Verlag  [2209 journals]   [SJR: 0.25]   [H-I: 19]
• Kinetics of the total oxidation of        class="a-plus-plus">para-xylene and its mixtures
with carbon monoxide over supported copper catalysts
• Abstract: Abstract The kinetics of the total oxidation of para-xylene and its mixtures with CO over alumina-supported copper catalysts has been investigated at atmospheric pressure in the temperature range from 200 to 270°C. The reactions over the catalysts 10%CuO/γ-Al2O3 and (10%CuO + 20%CeO2)/γ-Al2O3 obey the same kinetic equations in fractional rational form. These equations imply that the reactions occur at medium surface coverages of adsorbed substances and differ only in numerical values of constants. The simultaneous oxidation of para-xylene and CO reveals a complicated mutual influence associated with the formation of new intermediates inducing a change in the kinetics of the process.
PubDate: 2014-09-01

• Catalytic oxidation of glyoxal to glyoxalic acid over Au-Pd alloy
nanoparticles on hydrotalcite
• Abstract: Abstract Synthesis of glyoxalic acid by selective oxidation of glyoxal at ambient temperatures with O2 as an oxidant is an important problem. We found that gold nanoparticles supported on hydrotalcite (Au/HT) exhibit an appreciable catalytic activity for this reaction in the liquid phase. Moreover, Au-Pd/HT, prepared by the deposition-precipitation method is superior in the catalytic behavior to monometallic Au/HT and Pd/HT catalysts. Introduction of palladium enhances ability of the catalysts to oxidize carbonyl to carboxyl, weakens the power to rupture C-C bond and in this way improves the catalytic performance. Furthermore, the Au: Pd ratio also influences the properties of the alloy catalysts. The 1.5Au-1.5Pd/HT catalysts show the highest activity for the selective oxidation at ambient temperature producing glyoxalic acid in 13.4% yield at pH 7.7. Moreover, due to basic properties of hydrotalcite, glyoxalic acid could be synthesized over 1.5Au-1.5Pd/HT in 8.0% yield without adding a base. It is hoped that results of this study can fuel further research in designing new catalysts with alloy nanoparticles supported by hydrotalcite that can be used for the selective oxidation of other useful compounds.
PubDate: 2014-09-01

• Kinetics and possible mechanism of hydrogen chloride oxidation over
supported copper-containing salt catalysts: II. Kinetics of HCl oxidation
in the deacon and methane oxychlorination reactions over the CuCl       class="a-plus-plus">2-KCl-LaCl       class="a-plus-plus">3 catalyst
• Abstract: Abstract The kinetics of HCl oxidation at 350–425°C over the supported CuCl2-KCl-LaCl3 catalyst has been investigated using a gradientless technique. The HCl oxidation kinetics in the Deacon and methane oxychlorination reactions has been studied in order to substantially extend the $$Cl_2 \left( {P_{Cl_2 } } \right)$$ partial pressure variation range. When the reaction rate is independent of P HCl, HCl oxidation on the copper-potassium catalysts is described by the same rate equation, irrespective of whether the catalyst contains lanthanum or not. The introduction of lanthanum chloride increases the HCl oxidation rate by one order of magnitude. The rate equation obtained has significant advantages over the equation corresponding to the Kenney-Slama equation. The kinetic features of HCl oxidation over the lanthanum-containing catalyst, whether the process depends on P HCl or not, can be explained in terms of the superposition of the Kenney-Slama dissociative mechanism and the catalytic mechanism suggested here. The role of lanthanum chloride in both HCl oxidation pathways is considered.
PubDate: 2014-09-01

• Microwave synthesis of LaBO       class="a-plus-plus">3 (B = Co, Fe) perovskites
using graphite and citric acid additions
• Abstract: Abstract We studied the effects of graphite and citric acid additions on the formation of LaFeO3 and LaCoO3 perovskites upon microwave treatment of crystalline hydrates or nitrate solutions, respectively. The addition of graphite was shown to increase the yield of LaCoO3 perovskite and to result in the formation of crystalline LaFeO3 perovskite even at the microwave treatment stage. Subsequent thermal treatment at 800°C yields single-phase lanthanum ferrite with a high specific surface area (11 m2/g). Due to the addition of citric acid to nitrate solutions, a highly viscous gel forms, which allows preparation of single-phase perovskites with a high specific surface area (up to 34 m2/g) after microwave treatment and calcination. The samples obtained using the admixtures are characterized by a high catalytic activity in methane oxidation. No single-phase oxides form without introduction of these admixtures.
PubDate: 2014-09-01

• Kinetic model of thiourea dioxide decomposition in aqueous ammonia
• Abstract: Abstract The kinetics of the decomposition of thiourea dioxide in aqueous ammonia solution at various temperatures and ammonia concentrations has been investigated. The parameters of the individual steps of the process have been derived from experimental data by solving an inverse kinetic problem. The adequacy of the proposed kinetic model to the experimental data has been verified on the basis of the F-test and calculated correlation coefficients for the rate constants of the individual steps of the process.
PubDate: 2014-09-01

• Kinetics of the thermal treatment of an iron-molybdenum catalyst
• Abstract: Abstract The samples of iron molybdate obtained by the mixing of the solutions of ammonium heptamolybdate and iron nitrate were studied by thermal analysis. The temperature ranges and kinetic parameters of dehydration processes, the decomposition of impurities, and a topochemical reaction between iron and molybdenum oxides were determined. Data on the concentrations of solid phase components as functions of the temperature and duration of heat treatment were acquired.
PubDate: 2014-09-01

• KF promoted mesoporous γ-Al       class="a-plus-plus">2O       class="a-plus-plus">3 with strong basicity:
Preparation, characterization and catalytic activitiy for
transesterification to biodiesel
• Abstract: Abstract The present paper describes the preparation of KF/M-γ-Al2O3, efficient mesoporous solid bases. The procedure involves loading KF into a crystalline mesoporous γ-Al2O3 that was synthesized by the self-assembly of poly-4-vinylpyridine (P4VP) with Al3+ species. The synthesis is based on the strong acid-base interaction, hydrothermal treatment at 180°C and calcination at 550°C. Characterizations using XRD analysis and low temperature N2 adsorption indicated that different amounts of KF could be introduced into crystalline mesoporous γ-Al2O3 to obtain catalysts with high BET surface areas, large pore volumes and uniform pore size distribution. Based on SEM images, KF/M-γ-Al2O3 catalysts have rough surface character and a large nanopore volume. CO2-TPD curves registered for KF/M-γ-Al2O3 contain high temperature peaks, indicating strong basicity of the catalysts. Under the same reaction conditions KF/M-γ-Al2O3 catalysts exhibit much better activities for transesterification to biodiesel than KOH, NaOH, H2SO4, hydrotalcite and CaO. Enhanced activities appear to arise from strong basisity and large BET surface areas.
PubDate: 2014-09-01

• Synthesis of novel acidic ionic liquid immobilized on silica
• Abstract: Abstract A novel acidic ionic liquid immobilized on silica has been synthesized by hydrolyzing tetraethyl orthosilicate (TEOS) and the acidic ionic liquid derived from (3-aminopropyl) trimethoxysilane. The catalytic activities were evaluated in the acetalization and biodiesel synthesis. The results showed that the solid acid was a very efficient catalyst for the traditional acid-catalyzed reactions with the yield over 99.0%. A novel solid acid combined both the high activities inherent to the acidic ionic liquid and the feasibility of separation of the solid catalysts. High acidity, enhanced catalytic activities and improved stability were the key properties of the novel solid acid.
PubDate: 2014-09-01

• Kinetics and mechanism of CH       class="a-plus-plus">3Br, CHF       class="a-plus-plus">2Br, and C       class="a-plus-plus">2HF       class="a-plus-plus">4Br photolysis in the
presence of dioxygen under the action of λ = 253.7 nm light
• Abstract: Abstract The photolysis of CH3Br, CHF2Br, and C2HF4Br mixed with oxygen under radiation emitted by a bactericidal mercury lamp (radiation intensity maximum at λ = 253.7 nm) has been investigated. Oxygen was added in order to simulate natural conditions. A photolysis mechanism has been suggested, the corresponding model calculations have been carried out, and the calculated data have been compared with experimental data. The calculated absorption cross sections are in agreement with the literature, thus proving the validity of the mechanism suggested. The ratios between the rate constants of the reactions of the photolytically generated CH3, CHF2, and C2HF4 radicals with molecular bromine and oxygen have been determined.
PubDate: 2014-09-01

• MnO        class="a-plus-plus">x -Al       class="a-plus-plus">2O       class="a-plus-plus">3 catalysts for deep
oxidation prepared with the use of mechanochemical activation: The effect

• Abstract: Abstract The catalytic activity of alumina-manganese catalysts in the oxidation of CO was studied. The MnO x -Al2O3 catalysts were prepared by an extrusion method with the introduction of mechanically activated components (manganese oxide and its mixtures with aluminum oxide, aluminum hydroxide, and a mixture of a manganese salt with aluminum hydroxide) into a paste of aluminum hydroxide followed by thermal treatment in air or argon at 1000°C. In the majority of cases, the catalysts contained a mixture of the phases of β-Mn3O4 (Mn2O3), α-Al2O3, and δ-Al2O3. The presence of low-temperature δ-Al2O3 suggested the incomplete interaction of manganese and aluminum oxides. It was found that the catalytic activity of MnO x -Al2O3 depends on the degree of interaction of the initial reactants, and its value is correlated with the amount of β-Mn3O4 in the active constituent. The intermediate thermal treatment of components at 700°C negatively affects the catalytic activity as a result of the formation of Mn2O3 and the coarsening of particles, which levels the results of mechanochemical activation. The greatest degree of interaction between Al- and Mn-containing components was reached in the selection of mechanochemical activation conditions by decreasing the size of grinding bodies, optimizing the time of mechanochemical activation, and using the mechanochemical activation of precursor mixtures. As a result of mechanochemical activation, the initial reactants were dispersed, the amounts of MnO2 and Mn2O3 changed, and defects were formed; this strengthened the interaction of components and increased catalytic activity.
PubDate: 2014-09-01

• Analysis of the informativity of kinetic measurements in solving inverse
problems of chemical kinetics for multi-route reactions
• Abstract: Abstract Inverse problems of chemical kinetics that are solved in terms of a set of nonlinear ordinary differential, algebraic-differential, and algebraic equations corresponding to unsteady-state, steady-state, and equilibrium experimental conditions have been investigated. An algorithm has been devised for the analysis of the informativity of kinetic measurements in solving inverse problems of chemical kinetics for multi-route reactions.
PubDate: 2014-09-01

• Synergistic effect of additional TiO       class="a-plus-plus">2 support on metathesis
activity of ethylene and 2-butene over supported tungsten-based catalysts
for propylene production
• Abstract: Abstract Tungsten-based catalysts of different preparations mixed with TiO2 support were investigated in the metathesis of ethylene and trans-2-butene to propylene. The catalytic activity of silica-supported tungsten oxide catalyst (WO3/SiO2) mixed with TiO2 additional support had higher efficiency than that of mixed SiO2-TiO2 supported tungsten oxide (WO3/SiO2-TiO2). The clean area of the TiO2 additional support, which provides more space for tungsten migration, is an important key to explain the improved catalytic activity, due to the higher fraction of the isolated surface tetrahedral tungsten oxide species and better dispersion of the tungsten oxide species observed by FT Raman spectroscopy. In addition to the synergistic effect of the additional TiO2 support on the metathesis activity, the similar synergy was also observed for the one–third diluted catalysts with additional SiO2. It has been found that the synergistic effect exerted by the presence of additional SiO2 support predominates over the one-third dilution effect of catalyst concentration. Thus, adding an additional support is another simple way to improve the catalytic activity of the catalysts and makes great benefit for being used in real chemical industry.
PubDate: 2014-09-01

• Catalysts based on cordierite modified with transition metal oxides
• Abstract: Abstract Catalysts active in ammonia oxidation have been obtained by the substitution of transition metal (Mn, Fe, Co, Ni, and Cu) ions for Mg ions in the cordierite structure 2MgO · 2Al2O3 · 5SiO2 at 1100°C. Their phase composition, texture, and activity depend on the type and amount of introduced transition metal oxide. The Mn- and Cu-containing catalysts, which consist of substituted cordierites 2(Mg1 − x M x )O · 2Al2O3 · 5SiO2 and Mn2O3 or CuO crystallites located on their surface, are most active in ammonia oxidation. The catalysts are characterized by a small specific surface area and have large pores, whose total volume is small. The Fe-containing catalysts consist of the Fe-substituted cordierite phase and particles of an iron oxide phase. These particles are mostly located in internal pores of the catalysts and are, therefore, hardly accessible to ammonia molecules. The introduction of Co or Ni oxide leads to the formation of a low-active spinel phase rather than the cordierite phase.
PubDate: 2014-09-01

• The triumph of catalysis by metal complexes
• PubDate: 2014-09-01

• Kinetics and possible mechanism of hydrogen chloride oxidation over
supported copper-containing salt catalysts: I. Kinetics of HCl oxidation
in the deacon and methane oxychlorination reactions over a
copper-potassium salt catalyst
• Abstract: Abstract The kinetics of HCl oxidation at 350–425°C over a (CuCl2-KCl)/support catalyst in two complementary processes—Deacon and methane oxychlorination reactions—has been investigated using a gradientless technique. This has allowed the range of $$P_{Cl_2 }$$ in the reaction mixture to be markedly extended. New kinetic features of HCl oxidation under conditions such that this process does and does not depend on P HCl have been discovered. The kinetic equations obtained in this study fit experimental data in a wider range of conditions than the equations proposed earlier. The results of this study suggest the existence of two HCl oxidation pathways in the Deacon reaction.
PubDate: 2014-09-01

• Effect of the composition and structural and size characteristics of
composites based on stabilized zirconia and transition metal (Cu, Co, Ni)
oxides on their catalytic properties in methane oxidation reactions
• Abstract: Abstract The effects of transition metal (Cu, Co, Ni) oxides and platinum-group metals (Pt, Pd, Rh) in composites based on Y(Sc)-stabilized zirconia on their catalytic properties (activity, selectivity, sulfur resistance) and service life characteristics (thermal stability, performance stability) in methane oxidation reactions have been investigated. The high activity of the composites (75–99% methane conversion at 600–800°C) correlates with the amount and mobility of surface oxygen in these materials. The promoting effect of the platinum-group metals depends on the composition of the reaction medium (on whether it corresponds to the partial or total methane oxidation and on whether it contains sulfur dioxide).
PubDate: 2014-09-01

• State of the copper-containing component and the catalytic properties of
Cu/ZSM-5 in selective NO reduction with propane
• Abstract: Abstract Supported Cu/ZSM-5 catalysts have been synthesized by ion exchange and impregnation using aqueous ammonia solutions of copper nitrate containing orbital-ordered copper ions. The state of the copper-containing component in the pore space of the catalysts and copper sorption in the catalysts have been investigated by a complex of physicochemical methods. The catalytic properties of Cu/ZSM-5 in the selective catalytic reduction of NO with propane are reported. The catalytic properties depend on the copper precursor structure and deposition method, which determine the size of the copper oxide clusters on the outer surface of zeolite crystals.
PubDate: 2014-09-01

• Production of gas mixtures with regulated ratios between ethylene and
carbon monoxide by the gas-phase oxidative cracking of light alkanes
• Abstract: Abstract It was found that, in the gas-phase oxidative cracking of C2-C5 light alkanes, the ratio between ethylene and CO in the products depends on both the residence time in a reactor and the process temperature. This is due to a change in the contributions of product formation and/or consumption channels with increasing the conversion of the reactants. However, the hydrocarbon/oxygen ratio is the main parameter responsible for the limiting ratio between these products reached in the region of deep conversions of both of the reactants. The channels of formation and, correspondingly, the composition of the main products of oxidative cracking change on going from ethane to n-pentane. In this case, the ethylene: CO ratio increases due to an increase in the concentration of ethylene in the products as the number of carbon atoms in the initial alkane molecule is increased at a constant alkane: oxygen ratio. In the oxidative cracking of the C2+ alkane constituents of natural gases, it is necessary to consider the influence of methane, which inhibits the oxidative conversion of heavier alkanes in comparison with their oxidation in an inert gas atmosphere. This leads to a significant decrease in the conversion of oxygen and an increase in the ethylene: CO ratio in the reaction products.
PubDate: 2014-09-01

• 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

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