By J. F. Le Page

ISBN-10: 2710805316

ISBN-13: 9782710805311

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Extra resources for Applied Heterogeneous Catalysis: Design, Manufacture, and Use of Solid Catalysts

Sample text

A correct interpretation of experimental results will identify the step or steps that limit the overall rate of the reaction, and hence identify those parameters that can selectively accel erate the desired conversion. Within the general field of kinetics, it is helpful to distinguish between chemical kinetics that govern mechanisms of catalytic action and chemisorption and physical kinetics that govern mechanisms of intragranular and extragranular diffusion. The speed of different chemical reactions and physical movements in and on catalyst grains, which are usually difficult to identify experimentally, is related to chemical kinetics under the 11ubject of " micro kinetics, " The phenomena of movement through a catalytic bed in a reactor come under the subject of " macrokinetics.

On the other hand, other combined reactions, such as twin reactions of the same order, do not involve a variation of selectivity with the appearance of internal diffusional limitations. , d p/2 for a sphere). Calculation shows, moreover, that the plot of 11 = 17(qJ) varies very little with either the order of the chemical reaction (Fig. 2. 1 3) or the structure of the particles used. If the reaction involves large amounts of heat, temperature gradients that complicate the expression of 17 1 as a function of qJ 1 (Fig.

2. 1 1 ) and Eq. (2. 1 3). On the other hand, other combined reactions, such as twin reactions of the same order, do not involve a variation of selectivity with the appearance of internal diffusional limitations. , d p/2 for a sphere). Calculation shows, moreover, that the plot of 11 = 17(qJ) varies very little with either the order of the chemical reaction (Fig. 2. 1 3) or the structure of the particles used. If the reaction involves large amounts of heat, temperature gradients that complicate the expression of 17 1 as a function of qJ 1 (Fig.

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Applied Heterogeneous Catalysis: Design, Manufacture, and Use of Solid Catalysts by J. F. Le Page


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