Kinetics and Catalysis

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Effect of the acidity and chemical nature of the protonating agent on the rate of acetylene reduction catalyzed by the nitrogenase active site isolated from the enzyme
Kinetics and Catalysis - Tập 53 - Trang 306-312 - 2012
T. A. Bazhenova, N. V. Kovaleva, G. N. Petrova
The effect of the acidity (pK a) of the source of protons on the rate and selectivity of acetylene reduction has been investigated in order to elucidate the mechanism of protonation of substrate molecules coordinated to the reduced FeMoco cluster. A number of compounds whose pK a in DMF varies between 6 and 20 have been examined as protonating agents. The rate of th...... hiện toàn bộ
A comparative study of Ir/Ga2O3, Pt/Ga2O3, and Ru/Ga2O3 catalysts in selective hydrogenation of crotonaldehyde
Kinetics and Catalysis - Tập 49 - Trang 574-580 - 2008
E. Gebauer-Henke, J. Farbotko, R. Touroude, J. Rynkowski
Catalytic performance of gallia-supported iridium catalysts in the reaction of selective hydrogenation of crotonaldehyde in the gas phase was studied and compared to that of platinum and ruthenium catalysts. The best catalytic properties in terms of the selectivity to crotyl alcohol are shown by 5 wt % Pt/α-Ga2O3 and 5 wt % Ir/α-Ga2O3 catalysts prepared from nonchlorine precursors: Pt(acac)2 and I...... hiện toàn bộ
One-pot three-component Mannich reaction catalyzed by iodine under solvent-free conditions
Kinetics and Catalysis - Tập 52 - Trang 397-400 - 2011
Li Gang, Long Ruiling, Yang Jiangli
One-pot three-component Mannich reactions of ketones with aromatic aldehydes and aromatic amines are effectively catalyzed by molecular iodine at room temperature under solvent-free conditions to afford the corresponding β-amino carbonyl compounds with moderate to excellent yields. The method has the following advantages: no use of solvent, mild condition, high reaction speed and small quantity of...... hiện toàn bộ
Mathematical modeling of styrene and butyl acrylate homopolymerization via the reversible addition-fragmentation mechanism
Kinetics and Catalysis - Tập 55 - Trang 154-162 - 2014
N. V. Ulitin, E. B. Shirokikh, I. I. Nasyrov, D. Sh. Kalinina, V. A. Sidel’nikova, E. V. Samarin, R. Ya. Deberdeev
A mathematical model is suggested for the kinetics of the controlled free-radical polymerization of two monomers—styrene and butyl acrylate—via the reversible addition-fragmentation chain transfer (RAFT) mechanism (with 2,2′-azobisisobutyronitrile as the initiator and dibenzyl trithiocarbonate as the RAFT agent). A comparison of experimental molecular weight characteristics of polystyrene and poly...... hiện toàn bộ
Kinetics Modeling of Fischer–Tropsch Synthesis on the Cobalt Catalyst Supported on Functionalized Carbon Nanotubes
Kinetics and Catalysis - Tập 59 - Trang 701-709 - 2019
B. Hatami, A. Tavasoli, A. Asghari, Y. Zamani, A. Zamaniyan
An active cobalt catalyst supported on functionalized carbon nanotubes was prepared and tested for CO hydrogenation to produce liquid hydrocarbons in the Fischer–Tropsch synthesis. The catalyst characterization was carried out using different methods including X-ray diffraction, transmission electron microscopy and BET surface area equation. The kinetic experiments were performed in a fixed-bed re...... hiện toàn bộ
Phase composition and texture of Sr(La)Mn hexaaluminates
Kinetics and Catalysis - Tập 50 - Trang 824-829 - 2009
M. V. Bukhtiyarova, A. S. Ivanova, G. S. Litvak, L. M. Plyasova
Hexaaluminates synthesized by precipitation and calcined at 700–1400°C have been characterized by atomic absorption spectroscopy, thermal analysis, X-ray powder diffraction, and adsorption methods. The heat treatment of the Mn-substituted and unsubstituted materials at 1100 and 1200°C yields a hexaaluminate phase. The specific surface area of the samples calcined at 1100°C is 20–49 m2/g. The textu...... hiện toàn bộ
Functional chemical models of multielectron water oxidation in photosynthesis
Kinetics and Catalysis - Tập 51 Số 6 - Trang 788-792 - 2010
Т. С. Джабиев
Effect of the Composition of Ni x Co3–xO4 (x = 0–0.9) Oxides on Their Catalytic Activity in the Low-Temperature Reaction of N2O Decomposition
Kinetics and Catalysis - Tập 59 - Trang 357-362 - 2018
Yu. A. Ivanova, E. F. Sutormina, L. A. Isupova, V. A. Rogov
The Ni x Co3–xO4 (x = 0–0.9) mixed oxides with a spinel structure modified with 2% Cs according to the Pechini method were prepared by coprecipitation from the solutions of nitrates with the use of (NH4)2CO3 as a precipitating agent. It was found that the catalytic activity of the samples in the reaction of nitrous oxide decomposition at temperatures of 150–400°C ...... hiện toàn bộ
Study of a reduction step during the continuous synthesis of N-amino-3-azabicyclo[3.3.0]octane. Kinetics, modelling, and optimization
Kinetics and Catalysis - Tập 51 - Trang 521-528 - 2010
M. Elkhatib, C. Darwich, F. Jaber, M. Tabcheh, H. Delalu
The reduction of N-chloro-3-azabicyclo[3.3.0]octane with sodium borohydride at different pH values and variable concentrations of the haloamine and reducing agent was studied. The reaction was found to be second order and exhibited a specific acid catalysis. The enthalpy and entropy of activation were determined at pH 12.89. A mathematical treatment of the kinetic data allowed a complete character...... hiện toàn bộ
Mechanism of the hydrolysis of N-aryliminotriphenylphosphoranes
Kinetics and Catalysis - Tập 46 - Trang 21-28 - 2005
S.-Y. Pyun, Y.-H. Lee, T.-R. Kim
Hydrolysis reactions of N-aryliminotriphenylphosphoranes (I) at varying pH have been investigated kinetically. The reactions produced aniline derivatives and triphenylphosphine oxide as the products. The reactions are first-order, and the Hammett ρ values are -0.29 and -0.63 at pH 3.0 and 8.0, respectively. The reaction rate increased linearly with acetate ion concentration at [AcO−] < 0.05 M and ...... hiện toàn bộ
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