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Chemische Kinetik, Reaktionskinetik - Aktuelle Forschungsartikel

 
Aktuelle Fachartikel Kinetik chemischer Reaktionen (Reaktionskinetik), sortiert nach Erscheinungsdatum.

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Uncertainty analysis of NO production during methane combustion Local and Monte Carlo uncertainty analyses of NO production during methane combustion were carried out, investigating the effect of uncertainties of kinetic parameters and enthalpies of formation. In Case I, the original Leeds methane oxidation mechanism with the NOx reaction block was used, but the enthalpies of formation of all species were updated. In Case II, the NCN-containing reactions of the prompt NO formation route were added and the rate parameters of several reactions were also updated. The NO production was examined at the conditions of the Bartok et al. experiments (PSR, T = 1565-1989 K, [phiv] = 0.8-1.2, residence time 3 ms). The Monte Carlo analysis provided the approximate probability density function and the variance of the calculated NO concentration, and also its attainable minimum and maximum values. Both mechanisms provided similarly good to acceptable agreement with the experimental results for lean and stoichiometric mixtures, whereas only mechanism Case II could reproduce the experimental data for rich mixtures after a realistic tuning of the parameters. Local uncertainty analysis was used to assess the contribution of the uncertainty of each parameter to the uncertainty of the calculated NO concentration. Enthalpies of formation of NNH and HCCO, and rate parameters of 20 reaction steps cause most of the uncertainty of the calculated NO concentrations at all conditions. The relative importance of the four main NO formation routes was investigated via the inspection of the reaction rates, embedded in the Monte Carlo analysis. NO formation in rich mixtures was dominated by the prompt route, whereas in leaner mixtures the share of the NO formation routes depended very much on the values of rate parameters, when varied within the uncertainty limits of kinetic data evaluations. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 754-768, 2008 Quelle: International Journal of Chemical Kinetics | 12 Sep 2008 | 6:37 pm CEST

A global sensitivity study of sulfur chemistry in a premixed methane flame model using HDMR The use of complex mechanisms is increasing within models describing a range of important chemical processes, including combustion. Parameters describing chemical reaction rates and thermodynamics can often be very uncertain. Highlighting the main parameters contributing to predictive uncertainty is an important part of model development. However, due to the computational cost of the models and their nonlinearity, traditional methods for sensitivity analysis are often not suitable. The high-dimensional model representation (HDMR) method was developed to express the input-output relationship of a complex model with a high-dimensional input space. A fully functional surrogate model can be constructed with low computational effort. First- and second-order sensitivity indices can then be calculated in an automatic way, over large input parameter ranges. These provide an importance ranking for the input parameters. An extension to the existing set of HDMR tools is developed in this work, where the number of HMDR component functions can be reduced to explore large dimensional input spaces very efficiently. The HDMR tools are demonstrated for a case study of a one-dimensional low-pressure premixed methane flame model doped with trace sulfur and nitrogen species. Uncertainties in rate constants and thermodynamic data are considered, leading to a study of 176 input parameters. Using the new HDMR tools, the use of screening methods such as the Morris method, which aim to identify unimportant parameters beforehand, can generally be avoided. However, in certain cases, a combination of a screening method and HDMR is computationally more efficient than using HDMR alone. The final ranking of important parameters is shown to be critically dependent on the uncertainty ranges chosen due to the nonlinearity of the model. The study demonstrates that the proposed HDMR method provides a powerful tool for general application to global sensitivity analysis of complex chemical mechanisms. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 742-753, 2008 Quelle: International Journal of Chemical Kinetics | 12 Sep 2008 | 6:35 pm CEST

Sensitivity analysis and robust experimental design of a signal transduction pathway system Experimental design for cellular networks based on sensitivity analysis is studied in this work. Both optimal and robust experimental design strategies are developed for the I[kappa]B-NF-[kappa]B signal transduction model. Based on local sensitivity analysis, the initial IKK intensity is calculated using an optimal experimental design process, and several scalarization measures of the Fisher information matrix are compared. Global sensitivity analysis and robust experimental design techniques are then developed to consider parametric uncertainties in the model. The modified Morris method is employed in global sensitivity analysis, and a semidefinite programming method is exploited to implement the robust experimental design for the problem of measurement set selection. The parametric impacts on the oscillatory behavior of NF-[kappa]B in the nucleus are also discussed. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 730-741, 2008 Quelle: International Journal of Chemical Kinetics | 12 Sep 2008 | 6:33 pm CEST

Reduced kinetic mechanism for high-temperature propane ignition The high-temperature ignition (above 1100 K) of propane and air mixtures is studied in this work. The initial detailed mechanism consists of 177 elementary reactions with 40 species, which reproduces the ignition time of propane under a wide range in the parametric space (initial temperature, equivalence ratio, pressure). Through a systematic reduction strategy, using the classical normalized sensitivity analysis, the minimal set of elementary chemical reactions can be reduced to 43 with 27 species, reproducing the ignition conditions. Basically, the ignition delay time corresponds to the depletion time of the propane fuel, attacked by radicals, which produces secondary fuels such as ethylene (C2H4), ethane (C2H6), and acetylene (C2H2), among others, which are consumed in times much shorter than the consumption time of the primary fuel. Thus, the radical concentrations must be properly deduced to describe correctly the ignition delay time. A 15-step global reaction mechanism is proposed and tested successfully. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 721-729, 2008 Quelle: International Journal of Chemical Kinetics | 11 Sep 2008 | 3:28 pm CEST

Analysis of a budding yeast cell cycle model using the shapes of local sensitivity functions The Chen et al. (Mol Biol Cell 2000, 11, 369-391) budding yeast cell cycle model is a biochemical kinetic model that describes how the controlling protein concentrations change during a proliferation cycle. Time dependence of local sensitivity coefficients was calculated for all variables and parameters of the model. Some of the local sensitivity coefficients - time functions could also be obtained from another one by multiplying it with a constant, which means that these functions exhibit global similarity. Local similarity of the sensitivity functions was also detected. The distance of the shapes of two scaled sensitivity functions was defined by the integrated squared difference of these functions. The distance matrices of function shapes were interpreted by a clustering method, and the shapes could be sorted to two main groups for each model variable. The presence of the global similarity of sensitivity functions means that the change of some enzyme activities can be fully compensated by changing the activity of other enzymes. This feature can be related to the robustness of living organisms. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 710-720, 2008 Quelle: International Journal of Chemical Kinetics | 10 Sep 2008 | 3:23 pm CEST

Toward a reduction of the bimolecular reaction model for titan's ionosphere The aim of this paper is to highlight the skeletal chemistry responsible for the rich ionospheric chemistry observed in Titan's atmosphere. The present database is represented by about 700 ion-molecule reactions, which are not all important to describe the system. Our criterion to reduce the list of reactions is to reproduce a reference mass spectrum within its uncertainties. This reference mass spectrum is obtained with the complete reaction database and with neutral densities optimized for the INMS mass spectrum measured at 1200 km during the T5 flyby. We compared two mechanism reduction methods, brute force screening and global sensitivity analysis. The analysis of the residual scheme with only 35 bimolecular reactions highlights several patterns, concerning in particular ionic growth processes and introduction of nitrogen to the ionic species. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 699-709, 2008 Quelle: International Journal of Chemical Kinetics | 10 Sep 2008 | 3:14 pm CEST

Moment independent and variance-based sensitivity analysis with correlations: An application to the stability of a chemical reactor Recent works have attracted interest toward sensitivity measures that use the entire model output distribution, without dependence on any of its particular moments (e.g., variance). However, the computation of moment-independent importance measures in the presence of dependencies among model inputs has not been dealt with yet. This work has two purposes. On the one hand, to introduce moment independent techniques in the analysis of chemical reaction models. On the other hand, to allow their computation in the presence of correlations. To do so, a new approach based on Gibbs sampling is presented that allows the joint estimation of variance-based and moment independent sensitivity measures in the presence of correlations. The application to the stability of a chemical reactor is then discussed, allowing full consideration of historical data that included a correlation coefficient of 0.7 between two of the model parameters. © 2008 Wiley Periodicals, Inc. Int J Chem Kinet 40: 687-698, 2008 Quelle: International Journal of Chemical Kinetics | 9 Sep 2008 | 2:29 pm CEST

Sensitivity analysis in chemical kinetics No Abstract. Quelle: International Journal of Chemical Kinetics | 8 Sep 2008 | 3:05 pm CEST

A new kinetic model of photocatalytic degradation of formic acid in UV/TiO2 suspension system with in-situ monitoring Abstract  The results show that a newly developed kinetic model can successfully explain the photocatalytic kinetics of formic acid in UV/TiO2 suspension system with in-situ monitoring and the apparent rate constant (k) is affected by the initial concentrations of formic acid, amounts of TiO2, UV intensity and pH. Content Type Journal Article DOI 10.1007/s11144-008-5201-1 Authors Qiang Chen, Lanzhou University College of Atmospheric Sciences Lanzhou 730000 P.R.China Jiang Chang, Lanzhou University College of Resource and Environmental Science Lanzhou 730000 P.R.China Li Li, Lanzhou University College of Chemistry and Chemical Engineering Lanzhou 730000 P.R.China Jiu Yi Yuan, Lanzhou University College of Atmospheric Sciences Lanzhou 730000 P.R.China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Oxidation of thiols to disulfides using H2O2 catalyzed by recyclable chromic potassium sulphate at room temperature Abstract  Chromic potassium sulphate is found to be an efficient and recyclable catalyst for the selective oxidation of thiols to disulfides. The reaction was carried out in 60% methanol (v/v) using 30% H2O2 at room temperature. Cr(III) forms a complex with thiol which was then oxidized by H2O2 to produce disulfide in excellent yield after a simple workup procedure. Content Type Journal Article DOI 10.1007/s11144-008-5223-8 Authors Amit Supale, Shivaji University Kinetics and Catalysis Laboratory, Department of Chemistry Kolhapur 416004 India Gavisiddappa Gokavi, Shivaji University Kinetics and Catalysis Laboratory, Department of Chemistry Kolhapur 416004 India Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Homogeneous catalysis: Kinetics and mechanism of oxidation of Ru(II) sensitizers by inorganic peroxides Abstract  The present research work involves the nature of interaction between the Ru(II) complex and inorganic peroxides in the absence of excitation by light photons. We synthesized a photosensitizer, ([Ru(dcbpy)2(biq)]Cl2·3H2O) and studied its thermal degradation in the presence of inorganic peroxides (hydrogen peroxide, peroxomonosulfate and peroxodisulfate). Progress of the thermal reaction between the Ru(II) complex and each peroxide in 0.5 M H+ solutions was followed spectrophotometrically by monitoring the disappearance of the Ru(II) complex at its maximum absorbance (λ = 514 nm). The reactivities of the peroxides were compared and suitable mechanisms proposed. Content Type Journal Article DOI 10.1007/s11144-008-5217-6 Authors Radhakrishnan Chitradevi, University of Madras Department of Energy [Chemistry-Interdisciplinary] Guindy Campus Chennai 600 025 India Sambandam Anandan, University of Madras Department of Energy [Chemistry-Interdisciplinary] Guindy Campus Chennai 600 025 India Pichai Maruthamuthu, University of Madras Department of Energy [Chemistry-Interdisciplinary] Guindy Campus Chennai 600 025 India Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Characterization and catalytic behavior of silica-supported copper catalysts prepared by impregnation and ion-exchange methods Abstract  Two kinds of Cu/SiO2 catalysts were prepared by impregnation (IM) and ion-exchange (IE) methods, and tested in dehydrogenation of 2-butanol to methyl-ethyl-ketone. Some kinds of Cu2+ on the IE catalyst could not be reduced during the reaction, and it produced the butene. The copper oxide over the IM catalyst could be reduced during the reaction, and showed stable dehydrogenation activity for 2-butanol. Content Type Journal Article DOI 10.1007/s11144-008-5178-9 Authors Wanchun Zhu, Jilin University College of Chemistry Changchun 130021 P.R. China Lixia Wang, Jilin University College of Chemistry Changchun 130021 P.R. China Shiyan Liu, Jilin University College of Chemistry Changchun 130021 P.R. China Zhenlu Wang, Jilin University College of Chemistry Changchun 130021 P.R. China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Alkylation of 2-naphthol with long-chain olefins over zeolites Abstract  Alkylation of 2-naphthol with tripropylene in the presence of zeolite catalysts HBEA, H-Y and H-MFI was studied. Comparative studies on the catalytic properties of H-BEA, H-Y and H-MFI zeolites were carried out under identical reaction conditions. The results showed that the H-BEA catalyst exhibited outstanding catalytic performance; and the conversion and selectivity of 2-naphthol could be 52.1% and 86.3%, respectively. It was found that the structure and acid strength of zeolite catalysts were the major influencing factors for the conversion and selectivity of 2-naphthol alkylation. Content Type Journal Article DOI 10.1007/s11144-008-5097-9 Authors Gang Li, Hebei University of Technology School of Chemical Engineering Tianjin 300130 P.R. China Fengxia Ren, Hebei University of Technology School of Chemical Engineering Tianjin 300130 P.R. China Yingjun Cui, Hebei University of Technology School of Chemical Engineering Tianjin 300130 P.R. China Fang Yang, Hebei University of Technology School of Chemical Engineering Tianjin 300130 P.R. China Jin Zhang, Hebei University of Technology School of Chemical Engineering Tianjin 300130 P.R. China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Mg-Al-O-t-Bu hydrotalcite as an efficient catalyst for the transesterification of dimethyl carbonate with ethanol Abstract  Mg-Al-O-t-Bu hydrotalcite was synthesized and characterized by XRD, FT-IR and TGA-DTA. It was proved to be an active heterogeneous catalyst for the transesterification of dimethyl carbonate (DMC) with ethanol. When the reaction was carried out over Mg-Al-O-t-Bu hydrotalcite at 80°C, 7 h, molar ratio of ethanol to DMC 5:1, 1.0 wt.% of catalyst, the conversion of DMC was 86.4%, the selectivity to diethyl carbonate (DEC) was 61.2%. This heterogeneous catalyst could be used 5 times without loss of its activity. Content Type Journal Article DOI 10.1007/s11144-008-5192-y Authors Fuming Mei, Huazhong University of Science & Technology Department of Chemistry and Chemical Engineering Wuhan Hubei 430074 PR China Exiang Chen Guangxing Li, Huazhong University of Science & Technology Department of Chemistry and Chemical Engineering Wuhan Hubei 430074 PR China Aiqing Zhang, Huazhong University of Science & Technology Department of Chemistry and Chemical Engineering Wuhan Hubei 430074 PR China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Synthesis, characterization and catalytic performance of a novel magnetic SO42−-Y2O3-Fe3O4-ZrO2 solid acid catalyst Abstract  A novel magnetic SO4 2−-Y2O3-Fe3O4-ZrO2 solid acid catalyst was prepared by the co-precipitation method. The results revealed that the introduction of Y2O3 improved markedly the thermal stability of tetragonal zirconia. The catalyst exhibited high catalytic activity and stability in cyclohexanone condensation. Content Type Journal Article DOI 10.1007/s11144-008-5194-9 Authors Piaoping Yang, Harbin Engineering University College of Material Science and Chemical Engineering Harbin 150001 P.R. China Jun Wang, Harbin Engineering University College of Material Science and Chemical Engineering Harbin 150001 P.R. China Yongchen Shang, Harbin Normal University College of Chemistry Harbin 150081 P.R. China Jingjing Yang, Harbin Engineering University College of Material Science and Chemical Engineering Harbin 150001 P.R. China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Catalytic reduction of nitrogen monoxide with propene over Nb/TiO2 mixed mechanically with Mn2O3 Abstract  Selective catalytic reduction of nitrogen monoxide (NO) over a catalyst of mechanically mixed Nb/TiO2 and Mn2O3 (Mn2O3+Nb/TiO2) in an oxidizing atmosphere with propene (C3H6) was studied. The Mn2O3+Nb/TiO2 catalyst showed high activity for the reduction of NO to N2. The maximum conversion of NO to N2 was observed at 200∼300°C, with about 80% reduction of NO to N2. Mn2O3 enhanced the formation of NO2 from NO and the activation of propene to react with NO2 for reduction to N2. Content Type Journal Article DOI 10.1007/s11144-008-5184-y Authors Hironori Kawai, Tokyo Institute of Technology Department of International Development Engineering 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan Hirofumi Hinode, Tokyo Institute of Technology Department of International Development Engineering 2-12-1 Ookayama, Meguro-ku Tokyo 152-8552 Japan Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Asymmetric synthesis of α-aryloxy alcohols via kinetic resolution of terminal epoxides catalyzed by (R,R)-N,N′-bis(2-hydroxy-5- tert -butylsalisilidine)-1,2-cyclohexenediamino cobalt Abstract  New chiral Co-salen complexes with tert-butyl group in position 5 of the aromatic ring in the structure have been synthesized and they were applied as a chiral catalyst. A dimeric chiral salen having a transition metal salt such as AlCl3, displayed very high catalytic reactivity and enantioselectivity for the asymmetric ring opening of epoxides to synthesize optically pure α-aryloxy alcohols via phenolic kinetic resolution. Content Type Journal Article DOI 10.1007/s11144-008-5141-9 Authors Kwang-Yeon Lee, Inha University Department of Chemical Engineering Incheon South Korea 402-751 Choong-Young Lee, Inha Technical College Department of Chemical and Environmental Technology Incheon South Korea 402-751 Geon-Joong Kim, Inha University Department of Chemical Engineering Incheon South Korea 402-751 Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Dramatic improvement of catalyst life by rhodium and cerium additives for Ni-based reforming catalysts Abstract  Rhodium and cerium were found to be suitable additives for improving the sulfur-tolerance of Ni-based gasoline reforming catalysts. In these cases, the Rh content was only 0.1 wt.% with 5 wt.% of Ce. The lifetime of Rh-Ce-modified Ni-based catalyst is found to be above 600 hours at 1023K, which is over a ten times longer lifetime than that of the unmodified catalysts, when premium gasoline was used. Content Type Journal Article DOI 10.1007/s11144-008-5099-7 Authors Kazuhisa Murata, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Masahiro Saito, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Isao Takahara, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Megumu Inaba, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Propane formation by aqueous-phase reforming of glycerol over Pt/H-ZSM5 catalysts Abstract  Solid acid supports such as H-ZSM5, H-Mordenite, γ-Al2O3, USY and Beta catalysts were modified with Pt. These Pt/oxide catalysts were found to be active for propane formation through aqueous reforming of glycerol in the presence of hydrogen. The reforming reactions, possibly, proceeded through reaction cycles of dehydration on acid sites and hydrogenation on Pt sites over the catalysts. Content Type Journal Article DOI 10.1007/s11144-008-5190-0 Authors Kazuhisa Murata, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Isao Takahara, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Megumu Inaba, AIST Tsukuba Central 5 Biomass Technology Research Center, National Institute of Advanced Industrial Science and Technology 1-1-1, Higashi, Tsukuba Ibaraki 305-8565 Japan Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Correlation between reduction potential of vanadium-containing heteropolyacid (HPA) catalysts and their oxidation activity for cyclohexanol dehydrogenation Abstract  Vanadium-containing H6+xP2Mo18−xVxO62 (x = 0, 1, 2 and 3) Wells-Dawson heteropolyacid (HPA) and H3+xPMo12−xVxO40 (x = 0, 1, 2 and 3) Keggin HPA catalysts were applied to the vapor-phase dehydrogenation of cyclohexanol. The catalytic oxidation activity showed a volcano-shaped curve with respect to vanadium substitution for both families of HPA catalysts. The Wells-Dawson HPA showed a better catalytic oxidation performance than the Keggin HPA at the same level of vanadium substitution. Content Type Journal Article DOI 10.1007/s11144-008-5202-0 Authors Dong Ryul Park, Seoul National University School of Chemical and Biological Engineering Shinlim-dong Kwanak-ku Seoul 151-744 South Korea Heesoo Kim, Seoul National University School of Chemical and Biological Engineering Shinlim-dong Kwanak-ku Seoul 151-744 South Korea Ji Chul Jung, Seoul National University School of Chemical and Biological Engineering Shinlim-dong Kwanak-ku Seoul 151-744 South Korea Sang Hee Lee, Seoul National University School of Chemical and Biological Engineering Shinlim-dong Kwanak-ku Seoul 151-744 South Korea Joohyung Lee, Seoul National University School of Chemical and Biological Engineering Shinlim-dong Kwanak-ku Seoul 151-744 South Korea In Kyu Song, Seoul National University School of Chemical and Biological Engineering Shinlim-dong Kwanak-ku Seoul 151-744 South Korea Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Toluene combustion over Pd-based monolithic catalysts with a novel Ce x Zr 1−X O2 washcoat Abstract  A novel Ce x Zr 1−x O2 washcoat was prepared by impregnation, which acts as a host for the active Pd component to prepare a series of Pd-based monolithic catalysts for toluene combustion. The redox behavior and catalytic activity depend on the molar ratio of Ce to Zr. Content Type Journal Article DOI 10.1007/s11144-008-5193-x Authors Qingbao Zhang, Zhejiang Normal University Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry Jinhua 321004 P.R. China Leihong Zhao, Zhejiang Normal University Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry Jinhua 321004 P.R. China Lei Yue, Zhejiang Normal University Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry Jinhua 321004 P.R. China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Decolorization of C.I. Reactive Red 2 by ozonation catalyzed by Fe(II) and UV Abstract  This work evaluated the effects of pH on decolorization of C.I. Reactive Red 2 by O3, O3/Fe(II), UV/O3 and UV/O3/Fe(II) systems. At pH 4, the decolorization rate constants of O3, O3/Fe(II), UV/O3 and UV/O3/Fe(II) systems were 1.78, 3.11, 2.04 and 3.18 hr−1, respectively. The decolorization rates and effective energy consumption constants of all systems were higher under basic conditions than under acidic conditions. Content Type Journal Article DOI 10.1007/s11144-008-5200-2 Authors Chung-Hsin Wu, Da-Yeh University Department of Environmental Engineering 112, Shan-Jiau Road Da-Tsuen, Chang-Hua Taiwan R.O.C. Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Oxidation of lean formaldehyde in air over an Au/CeO2 catalyst and its kinetics Abstract  The oxidation of low concentration formaldehyde in air over Au/CeO2, prepared by co-precipitation, was investigated. Power-law kinetic models were proposed and the parameters were estimated, which are r = −0.46 × e −14612 / RTCHCHO(303 K < T < 363 K) and r = −295.78 × e −34178 / RT CHCHO (363 K < T < 413 K). The mechanism of the reaction at low temperatures might be different from that at high temperatures. Content Type Journal Article DOI 10.1007/s11144-008-5187-8 Authors Xuzhuang Yang, the Inner Mongolia University College of Chemistry and Chemical Engineering Huhhot 010021 P. R. China Yuenian Shen, the Inner Mongolia University College of Chemistry and Chemical Engineering Huhhot 010021 P. R. China Lili Bao, the Inner Mongolia University College of Chemistry and Chemical Engineering Huhhot 010021 P. R. China Huaiyong Zhu, the Queensland University of Technology School of Physical and Chemical Sciences Brisbane QLD 4001 Australia Zhangfu Yuan, CAS Institute of Process Engineering Beijing 100080 P. R. China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Catalytic properties of a (A=Ba, Ca, Sr and Y) modified lanthanum hexaaluminates for catalytic combustion of methane Abstract  A series of hexaaluminates, La0.8A0.2MnAl11O19−δ samples (A = Ba, Ca, Sr and Y) as new catalysts were prepared by carbonate precipitation and calcined at high temperature. The structure and properties of these samples were characterized by XRD, BET and XPS techniques. Upon calcination at 1200°C, the hexaaluminate structure was formed and it retained the specific surface area of 17∼20 m2g−1. The La0.8Ca0.2MnAl11O19−δ catalyst has a surface area of 19.3 m2g−1 and shows a good activity in CH4 combustion. Content Type Journal Article DOI 10.1007/s11144-007-5165-6 Authors Jiandong Zheng, Beijing University of Chemical Technology College of Chemical Engineering Beijing 100029 China Xiaoguang Ren, Beijing Institute of Petrochemical Technology Beijing 102617 China Yongji Song, Beijing Institute of Petrochemical Technology Beijing 102617 China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Preparation and evaluation of ammonia decomposition catalysts by high-throughput technique Abstract  The high-throughput technique has been successfully employed to investigate systematically NH3 decomposition catalysts for COx-free hydrogen production. Supported γ-Mo2N catalysts not only could be prepared and evaluated by the high-throughput experiment, but are also active for NH3 decomposition luke supported Ni and Co catalysts. Additionally, the preparation process and support play important roles on the catalytic performance of supported γ-Mo2N catalysts. Content Type Journal Article DOI 10.1007/s11144-008-5155-3 Authors Hongchao Liu, Chinese Academy of Sciences Laboratory of Applied Catalysis, Dalian Institute of Chemical Physics Dalian 116023 Liaoning China Hua Wang, Chinese Academy of Sciences Laboratory of Applied Catalysis, Dalian Institute of Chemical Physics Dalian 116023 Liaoning China Jianghan Shen, Chinese Academy of Sciences Laboratory of Applied Catalysis, Dalian Institute of Chemical Physics Dalian 116023 Liaoning China Ying Sun, Chinese Academy of Sciences Laboratory of Applied Catalysis, Dalian Institute of Chemical Physics Dalian 116023 Liaoning China Zhongmin Liu, Chinese Academy of Sciences Laboratory of Applied Catalysis, Dalian Institute of Chemical Physics Dalian 116023 Liaoning China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

The role of the nano-environment of supported gold catalysts in the activity control. Modification of Au/Al2O3 catalysts by redox-type metal oxides Abstract  Au/Al2O3 catalysts were modified by different redox metal oxides, such as FeOx, MnOx and CoOx, resulting in a pronounced activity increase in CO oxidation. Content Type Journal Article DOI 10.1007/s11144-008-5242-5 Authors Ervin Gy. Szabó, Hungarian Academy of Sciences Institute of Surface Chemistry and Catalysis, Chemical Research Center 1525 Budapest POB 17 Hungary Mihály Hegedűs, Hungarian Academy of Sciences Institute of Surface Chemistry and Catalysis, Chemical Research Center 1525 Budapest POB 17 Hungary József L. Margitfalvi, Hungarian Academy of Sciences Institute of Surface Chemistry and Catalysis, Chemical Research Center 1525 Budapest POB 17 Hungary Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:05 am CET

Heterogeneous liquid phase synthesis of 3,4-dihydropyrimidine-2(1H)-ones using aluminated mesoporous silica Abstract  Aluminated mesoporous silica (Al-SBA-15) with different amounts of Al contents were synthesized and used for the synthesis of 3,4-dihydropyrimidine-2(1H)-ones in the liquid phase, as well as under microwave conditions. The catalytic activity results showed very high conversion and yields of the products over many substituted aromatic aldehydes. Content Type Journal Article DOI 10.1007/s11144-008-5213-x Authors Amit Dubey, Birla Institute of Technology and Science Chemistry Group Pilani 333031 India Braja Gopal Mishra, Birla Institute of Technology and Science Chemistry Group Pilani 333031 India Divya Sachdev, Birla Institute of Technology and Science Chemistry Group Pilani 333031 India M. Sowmiya, Birla Institute of Technology and Science Chemistry Group Pilani 333031 India Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:04 am CET

Hydrogenation of 2-ethylanthraquinone over Pd/Zro2-γ-Al2O3 catalyst Abstract  A ZrO2-γ-Al2O3 supported Pd catalyst was prepared and characterized by XRD, XPS, H2-TPR and TEM techniques. The catalytic activity was evaluated in the liquid-phase hydrogenation of 2-ethylanthraquinone. Comparing with Pd/γ-Al2O3, it showed high catalytic activity. Content Type Journal Article DOI 10.1007/s11144-008-5218-5 Authors Feng Wang, Chinese Academy of Science State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Lanzhou 730000 China Xianlun Xu, Chinese Academy of Science State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Lanzhou 730000 China Kunpeng Sun, Chinese Academy of Science State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics Lanzhou 730000 China Journal Reaction Kinetics and Catalysis Letters Online ISSN 1588-2837 Print ISSN 0133-1736 Journal Volume Volume 93 Journal Issue Volume 93, Number 1 / January, 2008 Quelle: Reaction Kinetics and Catalysis Letters | 1 Mar 2008 | 9:04 am CET

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