The Transient Method and Elementary Steps in Heterogeneous Catalysis
Titel:
The Transient Method and Elementary Steps in Heterogeneous Catalysis
Auteur:
Bennett, Carroll O.
Verschenen in:
Catalysis reviews
Paginering:
Jaargang 13 (1976) nr. 1 pagina's 121-148
Jaar:
1976
Inhoud:
It is possible to consider the local rate of reaction in a fluid phase as a function of state variables, r(C, p, T). We assume that the concentrations of all the components C, which may, for example, be important in initiation and termination are included in the description. The rate must also be slow compared to other phenomena which might create a nonuniform mixture on the scale in which we are interested. If these restrictions are respected, we then can describe the rate in terms of a sequence of elementary steps, providing all the active intermediates are known. For gases the rate parameters (frequency factors, activation energy) for many elementary reactions have been measured; these matters are discussed, for example, in the book by Johnston [l]. The rate r (g-mole/cm3-sec) is in a certain sense a state function; it becomes related to a derivative or other quantities only as it appears in the conservation equations.
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