The methanol synthesis reaction CO+2H2CH3OH is reversible at typical operating conditions. With certain heterogeneous catalysts, the...

 

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The methanol synthesis reaction CO+2H2CH3OH is reversible at typical operating conditions. With certain heterogeneous catalysts, the reaction is thought to proceed according to the following sequence of elementary reac- tions: COS CO-S* (1) H2S H-S* (2) H2-S +CO-S* CHO-S* + S* (3) CH2O-S+H2-S* CH3OH-S* + S* (4) CH3OH-SCH3OH + S* (5) where S* is an empty site on the catalyst surface, and A-S* is species "A" adsorbed on a site. Reaction (3) is believed to be the rate-limiting step. 1. If K, is the equilibrium constant for Reaction (i), show that the equilibrium constant for the overall reaction is Keq = KKK3K4K5 2. Derive the form of the rate equation for methanol formation for this mechanism. The methanol synthesis reaction CO+2H2CH3OH is reversible at typical operating conditions. With certain heterogeneous catalysts, the reaction is thought to proceed according to the following sequence of elementary reac- tions: COS CO-S* (1) H2S H-S* (2) H2-S +CO-S* CHO-S* + S* (3) CH2O-S+H2-S* CH3OH-S* + S* (4) CH3OH-SCH3OH + S* (5) where S* is an empty site on the catalyst surface, and A-S* is species "A" adsorbed on a site. Reaction (3) is believed to be the rate-limiting step. 1. If K, is the equilibrium constant for Reaction (i), show that the equilibrium constant for the overall reaction is Keq = KKK3K4K5 2. Derive the form of the rate equation for methanol formation for this mechanism.