V. N. Parmon* and A. G. Okunev**
* Boreskov Institute of Catalysis, Siberian Division, Russian Academy of Sciences, Novosibirsk, 630090 Russia
** Novosibirsk State University, Novosibirsk, 630090 Russia
Received April 24, 1997
Abstract—It was found that the presence of a common intermediate in a system with several parallel catalytic
processes can substantially affect the selectivity and even reverse the direction of chemical reactions because
of thermodynamic coupling of the catalytic processes. The mutual effect of coupled processes can be described
by the modified Onsager equations in which the differences of the thermodynamic heads (that exponentially
depend on the chemical potentials) of the reactants and the products of catalytic reactions play a role of ther-
modynamic forces. As a particular example, kinetic and thermodynamic criteria were derived whose fulfillment
provides the absence of catalyst coking in the course of carbon dioxide conversion of methane.
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