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 collected over such a lot of human generations. This contains the practices of the clinical group, of educating, and of analysis. within the arguments about the reasons and merits of clinical endeavors, these in catalysis haven't been missed. certainly, they is not, for catalysis is necessarily a phenomenon of the maximum value to society. it might supply, in reality, an amazing area for every type of workouts pertaining to ''relevance.''
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Additional info for Advances in Catalysis, Vol. 24
By contrast, equations of the Langmuir-Hinshelwood type can describe the course of the coupled reaction from its very beginning and require many fewer constants. IV. Experimental Kinetic Studies of Some Systems of Coupled Reactions In this chapter we will discuss the results of the studies of the kinetics of some systems of consecutive, parallel or parallel-consecutive heterogeneous catalytic reactions performed in our laboratory. As the catalytic transformations of such types (and, in general, all the stoichiometrically not simple reactions) are frequently encountered in chemical practice, they were the subject of investigation from a variety of aspects.
The selection of suitable equations by nonlinear regression was based on the so-called critical value of the sum of squared deviations (7,99). An analysis of the effect of products and other reaction components, carried out experimentally in the same apparatus, however, with varying feed composition, was performed on the basis of the best equation from nonlinear regression, after its extension by the corresponding term. For this purpose we frequently tested the assumption that the added component is adsorbed on the same centers (either on one or on two) on which the studied reaction is taking place.
This makes the usual nu- + 22 L. BERXNEK merical integration of the equation starting from initial conditions impossible. Another disadvantage arises in the description of the kinetics of a consecutive reaction. In order to express an inhibiting effect of products, which was found experimentally in most cases, the exponent at the partial pressure of the product in the power-law equation should be negative. If, however, this substance undergoes further transformation in a subsequent reaction, this exponent should be positive, since the substance becomes the starting compound in this reaction.