Published in Kinetics and Catalysis
AbstractThe regularities of formation of the composition and structure of a highly efficient catalyst for methanol synthesis have been revealed. The catalyst was obtained by thermal treatment of the combined CuZnAl(Cr) hydroxocarbonate followed by the reductive activation of the anion-modified zinc oxide precursor. The composition and structure of ...
Published in Kinetics and Catalysis
AbstractPd/Al2O3 and Pd–M/Al2O3 catalysts (M = Au, Ag, Cu, Ce, Fe, Ni, Co, Zn) were obtained by ion exchange and impregnation. Pd/Al2O3 had high initial activity in the conversion of ethanol into α-alcohols, but lost 90% of its activity after 10 h of operation because of deactivation caused by the chemisorption of the by-product (CO) on Pd atoms. M...
Published in Kinetics and Catalysis
AbstractA method for solving the inverse problem of chemical kinetics based on the data of non-stationary experiments for multistage reactions is described. The method is based on the use of splines, which take into account the relaxation features of reactions with monotone kinetics. Examples of using the method to determine the intervals of physic...
Published in Kinetics and Catalysis
AbstractThe catalytic addition of methanol to the triple bond of acetylene occurred on the surface of mechanically pre-activated K2PdCl4 and formed dimethylacetal and the vinyl chloride by-product. The addition of alcohol occurs regioselectively in accordance with the Markovnikov rule. The stereoselectivity of acetylene hydrochlorination correspond...
Published in Kinetics and Catalysis
AbstractThe kinetic parameters of the pyrolysis of Siberian fir bark were estimated by thermogravimetric analysis. The thermochemical conversion of the bark biomass was performed at heating rates of 5, 10, and 20 deg/min in an inert (argon) medium. The results of thermogravimetric and differential thermogravimetric analyses were studied by model-fi...
Published in Kinetics and Catalysis
AbstractA series of magnetic Ni doped CdFe2O4 hybrids (Ni-CdFe2O4) were prepared successfully through deposition–calcination method and characterized by XRD, TEM, SEM, EDS, Raman, BET, XPS, VSM and DRS. Under visible light irradiation, the photocatalytic properties of Ni-CdFe2O4 were investigated towards degradation of antibiotics tetracycline and ...
Published in Kinetics and Catalysis
AbstractThe catalytic characteristics of Pd–Ag/Al2O3 bimetallic catalysts with an Ag/Pd atomic ratio of 0.03–3.0 have been studied in the selective liquid-phase hydrogenation of diphenylacetylene and 1-phenyl-1-propyne. It has been found that an increase in the Ag/Pd ratio leads to a significant increase in selectivity, which, however, is accompani...
Published in Kinetics and Catalysis
AbstractA catalyst grain in a fixed-bed reactor is surrounded by an non-uniform flow because the reactant concentration changes as the reaction mixture moves through the bed. A problem was considered in which a spherical grain is in an non-uniform flow with a linear dependence of the reactant concentration on the longitudinal coordinate of the reac...
Published in Kinetics and Catalysis
AbstractA sample of palladium nanoparticles with an average size of ~5 nm on the surface of highly oriented pyrolytic graphite (HOPG) was prepared by vacuum deposition. With the use of X-ray photoelectron spectroscopy (XPS), it was found that the interaction of the resulting Pd/HOPG sample with nitrogen dioxide at room temperature and a pressure of...
Published in Kinetics and Catalysis
AbstractThe kinetics and mechanisms of the reactions of some natural phenylpropanoids from the group of hydroxycinnamic acids with the stable radical 2,2'-diphenyl-1-picrylhydrazyl in polar nonionizing media were studied by kinetic and spectrophotometric methods. The kinetic and stoichiometric parameters of the reaction were determined. The magnitu...
