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Surface Catalyzed reaction
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Problem 1 (30 pts) Consider the following gas phase surface catalyzed reaction that proceeds through the
corresponding adsorbed species:
A + B + C +D
The mechanistic steps are:
ка
A Aad
Кь
Be Bad
Aad + Bad → Cad + Dad
Kc
Cad fc
Kd
Dad D
(a) Derive an expression for the overall rate of the reaction, assuming that the surface-catalyzed
reaction is rate limiting, and has a rate constant, kr.
(b) Now in the case where B is strongly adsorbing, that is, K >> 1/P, Ka, Kc, Kd, simplify the
expression for the overall rate. What is the apparent activation energy corresponding to this
simplified rate expression. Assuming that the absorption entropies of all the species are similar,
do you expect the apparent activation energy to be positive or negative? Why?
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