Chap10Lecture2N - Chapter10 Topics Steps in a Catalytic...

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Chapter 10 Topics Steps in a Catalytic Reaction Adsorption, Surface Reaction, Desorption Steps Rate Limiting Step Formulating the Mechanism and the Rate Law
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Reaction 1 2 6 7 A B 4 3 5 External diffusion Internal diffusion Desorption Adsorption Catalyst surface A B
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Packed  catalyst  bed Catalyst  pellet Catalyst  pellet  surface Catalytic packed bed reactor
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Adsorption At equilibrium Elementary reaction H 2 •S = adsorbed molecule C t = concentration of total sites C v = concentration of vacant sites k = rate constants H 2 + S ↔ H 2 S - = = 2 2 2 0 H S H v H AD K C C P k r t H H H H S H S H v t v H H S H C P K P K C C C C C P K C 2 2 2 2 2 2 2 2 2 1 + = + = =
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Dissociative Adsorption At equilibrium H 2 + 2S ↔ 2H · S H H H H t S H K P K P C C 2 2 1 + = - = = H S H v H AD K C C P k r 2 2 2 0 Langmuir Isotherms
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Adsorption Isotherm A + S A · S A B Total concentration of sites: C t = C v + C A•S + C B•S This is called site balance
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This note was uploaded on 12/17/2011 for the course CHEMICAL E 304 taught by Professor Darwish during the Spring '11 term at American University of Sharjah.

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Chap10Lecture2N - Chapter10 Topics Steps in a Catalytic...

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