Kinetics of Catalysed Reactions

For a further discussion of the structure and properties of bimetallic systems, see Sections 2.6 and 3.2.3 for the preparation of bimetallic catalysts, see Section 4.6 and for the mechanisms by which they work in oxidations, see Section 8.2.2. Most textbooks of physical chemistry have sections on adsorption and catalysis, but they frequently focus on studies made under ultra-high vacuum conditions with single crystal surfaces. While this work produces beautiful pictures, it has limited relevance to the more mundane world of practical catalysis. Other introductory treatments of about the level of this chapter, or slightly more advanced, are available,5,7,11 as are deeper discussions of the kinetics of catalysed reactions.12 14 Industrial processes using catalysts have also been described in detail.15,16... 

Steps 3-5 are strictly chemical and consecutive to each other Hougen-Watson-Langmuir-Hinshelwood rate equations describing the rate of the purely chemical phenomenon consisting of steps 3-5 have been derived in Chapter 3 on the kinetics of catalysed reactions. In the transport-limited situation the supply of reactant and/or the removal of reaction product will not be sufficiently fast to keep pace with the potential intrinsic rate, and the concentrations of A and B inside the pores will be different from the corresponding concentrations in the bulk of the fluid phase. 

Some prior knowledge has to be assumed. Elementary concepts concerning chemisorption and the kinetics of catalysed reactions will not be described only where the literature reveals ignorance and misunderstanding of basic concepts will discussion of them be included. Total linearity of presentation is impossible, but in the main I have tried to follow a logical progression from start to finish. 

The definition of a catalyst as a reaction-accelerator when first proposed by Ostwald stimulated research into the kinetics of catalysed reactions. Falk s definition is less ambitious and more precise, and furthermore avoids the objection that many reactions susceptible of catalysis do not appear to take place at all in the absence of the catalyst. 

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