By D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)
(from preface)There were many demanding situations in our decade to associations, customs, principles, to just about every little thing that has grown and amassed over such a lot of human generations. This comprises the practices of the clinical group, of training, and of study. within the arguments about the reasons and merits of clinical endeavors, these in catalysis haven't been neglected. certainly, they just isn't, for catalysis is necessarily a phenomenon of the maximum significance to society. it might probably offer, in truth, an amazing area for every type of routines bearing on ''relevance.''
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Additional info for Advances in Catalysis, Vol. 24
B. EFFECT OF THE ARRANGEMENT OF THE SLOWSTEPS In the case of coupled heterogeneous catalytic reactions the form of the concentration curves of analytically determined gaseous or liquid components in the course of the reaction strongly depends on the relation between the rates of adsorption-desorption steps and the rates of surface chemical reactions. This is associated with the fact that even in the case of the simplest consecutive or parallel catalytic reaction the elementary steps (adsorption, surface reaction, and desorption) always constitute a system of both consecutive and parallel processes.
The influencing of individual reactions by products and by the intermediate product was determined experimentally, by measuring their effect on the reaction of m-xylene and toluene. The adsorption coefficients, which express this effect, are listed in Table 111. 2 30 . L. B E R ~ N E K As follows from the table, each of these compounds affects both reactions in practically the same way. This may indicate that both reactions proceed on the same sites of the surface of the catalyst and that each of the compounds involved is adsorbed on these centers in only one way.
Thus, for example, in the already cited hydrogenation of acetylene on a platinum and a palladium catalyst (45, 46) or in the hydrogenation or deuteration of 2-butynes on a palladium catalyst (57, 58), high selectivities in favor of reaction intermediates (alkenes) are obtained, even though their hydrogenation is in itself faster than the hydrogenation of alkynes. It should be noted that many practically important catalytic transformations (such as isomerization of or hydrocracking of paraffins), which are presumed to proceed via consecutive mechanisms, are performed on multifunctional catalysts, with which the coupling of reactions in the sense just discussed may not necessarily occur.