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Advances in Catalysis, Vol. 24 by D.D. Eley, Herman Pines, Paul B. Weisz (Eds.)

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 thing that has grown and accrued over such a lot of human generations. This contains the practices of the medical group, of training, and of study. within the arguments about the reasons and advantages of medical endeavors, these in catalysis haven't been ignored. certainly, they is not, for catalysis is necessarily a phenomenon of the maximum value to society. it could possibly offer, actually, a fantastic area for all types of routines referring to ''relevance.''

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Extra resources for Advances in Catalysis, Vol. 24

Example text

By equilibria of the fast steps, surface chemical reactions, and the other adsorption and desorption processes. Concentration dependencies of several types of consecutive and parallel (branched) catalytic reactions (52, 53) were calculated, corresponding to schemes (IIa) and (IIb), assuming that they are controlled by the rate of adsorption of either of the reactants A and X, desorption of any of the products B, C, and Y, or by simultaneous desorption of compounds B and C. +X ASB+Y A-B +Y (1) (4) 11 +x C+Y (114 (2) 11c + :; + ZY (IIb) 14 L.

D. NONSUITABILITY OF THE POWER-LAW TYPEEQUATIONS As follows from our experimental studies to be discussed in Section IV, the kinetics of single reactions in the initial region could in most cases be better described by equations of the Langmuir-Hinshelwood type than by power-law type equations, Similarly, for describing the effect of products and of mutual influencing of the reactions, and thus for describing the kinetics of coupled catalytic systems in general, the equations of the first type are particularly suitable.

The BET surface area was 870 m2/g. Prior to kinetic measurements, the catalyst was modified by passing over acetic acid vapors (100 g acid/l g catalyst). 4 meq/g of -SOsH groups. It was dried prior to using a t 90°C/14 Torr. The BET surface area, determined in a dry state, was 49 m2/g, and the mean pore size was around 100 A. A platinum-iron on silica gel catalyst was prepared by impregnating silica gel (BDH, for chromatographic adsorption) with an aqueous solution of chloroplatinic acid (analytical grade) and sodium hydroxide (analytical grade).

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