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Homework+9+rev1 - Chemical Engineering 142 Homework Set#9...

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Chemical Engineering 142 Homework Set #9 100 points total Due Wednesday, April 7, 2010 Problem 1 (20 points) A possible mechanism for the reduction of NO by CO on a Pt catalyst consists of the following elementary steps NO + * NO * K 1 CO + * CO * K 2 CO * + NO * CO 2 + N * + * K 3 N * + N * N 2 + 2* k 4 The overall reaction is 2NO + 2CO --> 2CO 2 + N 2 Consider Steps 1-3 to be quasi-equilibrated (QE), and Step 4 to be irreversible. * designates a catalytic site. a) Find the rate expression for this reaction if * and CO* are the most abundant surface species. b) Simplify your expression from part a) for the case where CO* is the most abundant surface species. c) What is the apparent activation energy for the reaction from the rate expression in part b)? Problem 2 (20 points) Propene oxidation to propanol is believed to proceed via the following elementary steps O 2 + 2* 2O * K 1 C 3 H 6 + O * C 3 H 5 OH * k 2 , k -2 C 3 H 5 OH * C 3 H 5 OH + * k 3 a) Find the rate expression if Step 1 is QE.
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