Consider a heterogeneous gas-phase catalytic reaction: AB(g)→A(g)+B(g) (Catalyst) The surface reaction mechanism follows three steps: AB(g) +S <----> AB*S (Adsorption) AB*S<----> B*S+A(g) (Surface reaction) B*S <---> B(g) + S (Desorption) (a) Derive the rate law assuming desorption is rate-limiting. Express the overall reaction rate (- rab) in terms of total number of sites on the surface, C. partial pressures of the gas species (ie., Pab, Pa and Pb), rate constants of adsorption, the surface reaction, and desorption (ka,ks, and kd), and the equilibrium constants of adsorption, the surface reaction, and desorption (ie., K. Ks and Kd). Hint: Based on the reaction mechanism, only AB and B are adsorbed on the surface, i.e., there is no evidence that A alone can be adsorbed on the surface.
Consider a heterogeneous gas-phase catalytic reaction: AB(g)→A(g)+B(g) (Catalyst) The surface reaction mechanism follows three steps: AB(g) +S <----> AB*S (Adsorption) AB*S<----> B*S+A(g) (Surface reaction) B*S <---> B(g) + S (Desorption) (a) Derive the rate law assuming desorption is rate-limiting. Express the overall reaction rate (- rab) in terms of total number of sites on the surface, C. partial pressures of the gas species (ie., Pab, Pa and Pb), rate constants of adsorption, the surface reaction, and desorption (ka,ks, and kd), and the equilibrium constants of adsorption, the surface reaction, and desorption (ie., K. Ks and Kd). Hint: Based on the reaction mechanism, only AB and B are adsorbed on the surface, i.e., there is no evidence that A alone can be adsorbed on the surface.
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
Problem 1.1P
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Consider a heterogeneous gas-phase catalytic reaction:
AB(g)→A(g)+B(g) (Catalyst)
The surface reaction
AB(g) +S <----> AB*S (Adsorption)
AB*S<----> B*S+A(g) (Surface reaction)
B*S <---> B(g) + S (Desorption)
(a) Derive the rate law assuming desorption is rate-limiting. Express the overall reaction rate (- rab) in terms of total number of sites on the surface, C. partial pressures of the gas species (ie., Pab, Pa and Pb), rate constants of adsorption, the surface reaction, and desorption (ka,ks, and kd), and the equilibrium constants of adsorption, the surface reaction, and desorption (ie., K. Ks and Kd).
Hint: Based on the reaction mechanism, only AB and B are adsorbed on the surface, i.e., there is no evidence that A alone can be adsorbed on the surface.
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