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431_9 - MICHIGAN STATE UNIVERSITY CHE 431 Chemical Reaction...

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MICHIGAN STATE UNIVERSITY CHE 431 Chemical Reaction Engineering Fall 2007 Homework 9 Due Oct. 31, 2007 1) Fogler problem 10-7a – To remove oxides of nitrogen (assumed to be NO) from the automobile exhaust, a scheme has been proposed that uses unburned carbon monoxide (CO) in the exhaust to reduce the NO over a solid catalyst, according to the reaction: CO + NO Æ products (N 2 , CO 2 ) Experimental data for a particular solid catalyst indicate that the reaction rate can be well represented over a large range of temperatures by – r’ N = k P N P C (1 + K 1 P N + K 2 P C ) 2 where P N = gas-phase partial pressure of NO P C = gas-phase partial pressure of CO k, K 1 , K 2 = coefficients depending only on temperature Based on your experience with other such systems, you are asked to propose an adsorption- surface reaction-desorption mechanism that will explain the experimentally observed kinetics. 2) The following catalytic mechanism has been proposed for the liquid phase reaction: A = B + C
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