Chap10Lecture4N - 10.3SynthesizingRateLaw, Mechanism,...

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10.3  Synthesizing Rate Law,  Mechanism,  Rate Limiting Step Pt catalyzed decomposition of cumene to  form benzene and propylene C 6 H 5 CH(CH 3 ) 2   C 6 H 6  + C 3 H 6 π  orbitals of benzene form complex with catalyst surface. CH(CH 3 ) 2 CH(CH 3 ) 2 C 3 H 6 C 3 H 6 Cumene  adsorption Surface  reaction Benzene  desorption
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π -orbital complex on the catalyst surface
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Nomenclature C: cumene,       B: benzene    P: propylene,    I:  inhibitor Mechanism proposed C + S C•S k A k -A C•S B•S + P k S k -S B•S B + S k D k -D Adsorption of cumene  on the surface Surface reaction to form  adsorbed cumene and gas  propylene Desroption of benzene  from the surface
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Adsorptio n C + S C•S k A k -A r AD = k A P C C v – k -A C C•S C k A k -A C r AD = k A (P C C v –C C•S /K C ) C•S B•S + P(g) k S k -S r S = k S C C•S – k -S P P C B•S C Surface  Reaction r S = k S (C C•S – P P C B•S /K S ) Propylene is not adsorbed on the  surface. Thus  C P •S = 0 . k S k -S B + P
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B•S B + S k D k -D r D = k D C B•S - k -D P B C v B k D k -D B r D = k D (C B•S - P B C v /K DB ) K DB , benzene  desorption   equilibrium  constant  is the inverse of benzene  adsorption equilibrium constant K D Thus r
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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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Chap10Lecture4N - 10.3SynthesizingRateLaw, Mechanism,...

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