Download Chemical Kinetics and Catalysis by R. A. van Santen, J. W. Niemantsverdriet (auth.) PDF

By R. A. van Santen, J. W. Niemantsverdriet (auth.)

to the basic and utilized Catalysis sequence Catalysis is critical academically and industrially. It performs a necessary position within the manufacture of quite a lot of items, from fuel and plastics to fertilizers and herbicides, which might rather be unobtainable or prohibitively dear. There are few chemical-or oil-based fabric goods in modem society that don't count not directly on a catalytic level of their manufacture. except manu­ facturing procedures, catalysis is discovering different vital and ever-increasing makes use of; for instance, profitable purposes of catalysis within the keep an eye on of toxins and its use in environmental keep an eye on are guaranteed to elevate sooner or later. the industrial value of catalysis and the varied highbrow demanding situations of catalytic phenomena have influenced learn via a vast spectrum of scientists, together with chemists, physicists, chemical engineers, and fabric scientists. Increas­ ing learn job through the years has introduced deeper degrees of knowing, and those were linked to a regularly becoming quantity of released fabric. As lately as sixty years in the past, Rideal and Taylor may perhaps nonetheless deal with the topic comprehensively in one quantity, yet by way of the Nineteen Fifties Emmett required six volumes, and no traditional multivolume textual content may possibly now disguise the full of catalysis in any intensity. In view of this case, we felt there has been a necessity for a set of monographs, each of which might deal at a complicated point with a particular subject, with a view to construct a catalysis reference library.

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7. The isomerization of cis-butene to trans-butene is catalyzed by a proton which can be present as an acid site on an oxidic surface. The kinetic description of a catalytic reaction is based on the conservation of total numbers of catalytically active sites. Let N be the total number of sites available. We will denote an empty site by an asterisk *. 7. 1). The adsorption complex lads formed upon protonation is a carbenium ion. 103) using the steady-state approximation. As before, we wish to compute the rate of product formation as a function of reactant or product concentration by elimination of the concentration of the intermediate from the rate expressions.

At present, one can use computational methods to construct potential energy surfaces, which are based on increasingly accurate calculations of the electronic structure in interacting molecules. This, in principle, generates the possibility to predict reaction-rate constants based on atomistic information of surface complexes that are involved in the reaction. In this book, we demonstrate the use of transition-state theory to describe catalytic reactions on surfaces. In order to do this we start by treating the kinetics of catalytic reactions (Chapter 2) and provide some background information on important catalytic processes (Chapter 3).

9. 113) for the catalytic reaction between A and B, with competitive equilibrium adsorption of A and B, a rate-limiting irreversible surface reaction between Aads and Bads ' and a kinetically insignificant irreversible desorption of the product AB. Dashed lines represent the high temperature limits. JiB =-IOOkJ/mol, KA[A] =10-9 , KB[B] = 2 . 10- 10 ; the reaction rates have been scaled to unity at maximum. tively). In order to compensate for the difference in adsorption bond strength, A has been given a concentration five times higher than B.

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