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By J. F. Le Page

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3 ch : a constant characteristic of the gas , : a characteristic of the catalyst morphology , = superficial linear velocity depending on the reactor geometry. From which on first approximation: 2 41 KINETICS OF CHEM ICAL REACTIONS IN H ETEROGENEOUS CATALYSIS where B1 = constant characteristic of the reacting gas, e = fraction of voids in the catalytic bed, u = superf1cial linear flow rate of the gas through the catalytic bed. The relationship shows that the apparent rate of the reaction is increased by an increase u and a decrease in dp for a given value of ch .

Reaction time results in a straight line with constant negative slope. It is also a zero­ order reaction with respect to the hydrocarbon reaction, up to 9 5 % conversion, because the plots of hydrogen pressure are all parallel. From Wauquier, J. , Jungers, J. , Bull. Soc. Chim. France, 1 280, 1 957. For the second order reactions, the case where the catalyst is saturated merits attention; on saturation of the catalyst surface the rate, V, is expressed by: V_k - bA CA b B CB ( bA CA + bn Cn ) 2 This rate will be a maximum when the reactants are in stoichiometric proportion in the adsorbed phase b A CA bn Cn ; and at that maximum, the ratio of the coefficients of adsorption is inversely proportional to the ratio of the concentrations: bnfbA CA/Cn .

From Wauquier, J. , Jungers, J. , Bull. Soc. Chim. France, 1 280, 1 957. For the second order reactions, the case where the catalyst is saturated merits attention; on saturation of the catalyst surface the rate, V, is expressed by: V_k - bA CA b B CB ( bA CA + bn Cn ) 2 This rate will be a maximum when the reactants are in stoichiometric proportion in the adsorbed phase b A CA bn Cn ; and at that maximum, the ratio of the coefficients of adsorption is inversely proportional to the ratio of the concentrations: bnfbA CA/Cn .

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