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Chap10Lecture3N - 10.2.2.SurfaceReaction A S AS rAD =...

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10.2.2. Surface Reaction When A is adsorbed on a surface: A + S A•S r AD = k A (P A C v - C A.S /K A ) The surface reaction may take place 1. Single site mechanism A B A•S B•S - = S S B S A S S K C C k r
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Surface Rx 2 2. Dual site mechanism A B A•S + S B•S + S - = S v S B v S A S S K C C C C k r
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Surface Rx 2 2. Dual site mechanism A D A•S + B•S C•S + D•S - = S S D S C S B S A S S K C C C C k r Another dual site mechanism B C
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Surface Rx 3 2. Dual site mechanism A D A•S’ + B•S C•S’ + D•S - = S S D S C S B S A S S K C C C C k r ' ' A different type of dual site  mechanism B C Remember: For  each type of site  there is a site balance
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Surface Rx 4 2. Reaction between a gas molecule & adsorbed  molecule A D(g) A•S + B(g) C•S + D(g) - = S D S C B S A S S K P C P C k r B(g) C Eley-Rideal Mechanism
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10.2.3 Desorption
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