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V. M. Pinchuk E. S. Kotlyarova N. V. Parkhomenko P. N. Tsybulev 《Journal of Structural Chemistry》1996,37(4):544-556
The studies concerned with the oxidation of carbon monoxide on the nickel surface are reviewed. The Eley-Rideal (ER) collision
and Langmuir-Hinshelwood (LH) adsorption mechanisms of the oxidation are analyzed. Calculations of the activation barriers
of the oxidation of carbon monoxide on the Ni (111), (100), and (110) faces were performed for the first time and involved
optimization of the reaction paths by the collision and adsorption mechanisms. It is shown that on the Ni (111) and (110)
faces the ER collision mechanism of the reaction is preferable with the activation barriers ΔE
dis
O
2=62 kJ/mole and ΔE
trans
O
A21F50012x=25 kJ/mole for Ni (111) and ΔE
dis
O
2=72 kJ/mole and ΔE
trans
O
2=20 kJ/mole for Ni (110); on the Ni (100) face, the LH adsorption mechanism with the activation barriers ΔE
dis
O
2=75 kJ/mole and ΔE
trans
O
2=42 kJ/mole is favored. Analysis of the potential barriers for the catalytic oxidation of carbon monoxide on the Ni surfaces
suggests the LH mechanism to be preferential, although insignificant differences in the activation barries can lead to the
oscillatory reaction mechanism, which is confirmed experimentally. The calculations were performed by the LCAO MO SCF method
in the MINDO/3 approximation.
Kiev Polytechnical Institute. Translated fromZhurnal Struktumoi Khimii, Vol. 37, No. 4, pp. 628–645, July–August, 1996.
Translated by I. Izvekova 相似文献
2.
The steady-state mass transfer of a chemically active impurity to the surface of a stationary dumbbell-shaped particle consisting
of two solid contacting reacting spheres of different sizes is analyzed theoretically. The surrounding medium is at rest,
and the numerical concentration of the reagent at a large distance from the aggregate of the spheres is maintained constant.
The first-order chemical heterogeneous reaction occurs at a high finite rate and is assumed to be isothermal. The solution
to the boundary-value diffusion problem is described by a Laplace axisymmetric equation in the system of tangential-spherical
coordinates of revolution. A system of two second-order linear perturbed ordinary differential equations with variable coefficients
are obtained using the zero-order integral Hankel transformation and its properties from the boundary conditions for transformed
functions. Partial integrals and the mean auxiliary Sherwood numbers are obtained approximately. The solution to the formulated
problem is used in various technological applications associated with combustion or chemical reactions at the interface between
the continuous and discrete phases in the dispersed system, in meteorology, in analysis of problems associated with environmental
pollution, etc. 相似文献
3.
Tarasenko M. V. Kotlyarova V. D. Baykov S. V. Shetnev A. A. 《Russian Journal of General Chemistry》2021,91(5):768-778
Russian Journal of General Chemistry - An efficient one-pot method was developed for the synthesis of 2-(1,2,4-oxadiazol-5-yl)anilines via the reaction of amidoximes with isatoic anhydrides in a... 相似文献
4.
The effect of the evaporation coefficient of a large aerosol particle on the velocity of its thermophoretic motion in a binary gaseous mixture is studied. The thermodiffusion of the mixture components and Stefan phenomena are taken into consideration. The results of this study are more general than those obtained previously. The conventional theories of thermophoresis, as applied to a volatile high-viscosity liquid drop, are extended for the cases of weak and moderately intense diffusive evaporation. 相似文献
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