The kinetics of reactions on a surface consisting of several types of catalysis sites

Abstract

The proposal that the surface of a catalyst consists of several types of sites and the catalytic reaction step involves interaction of intermediate species adsorbed on the different types of sites is often made in explaining the kinetics of catalytic reactions. Thus, in a study of the partial oxidation of propylene together with ammonia, Shtyrkov et al. [i] proposed that three catalysis sites take part in the reaction: I) sites which interact with oxygen of the gas phase, 2) sites which lead to the oxidation reaction, and 3) sites which accomplish the transfer of oxygen from the first type of sites to the second type of sites. Babkova [2] and Snagovskii [3, 4] assemed that two types of sites are implicated in the hydrogenation of organic compounds on metals. One type of site adsorbs the hydrogen, while the second adsorbs the organic compound.