102111-hw4-f011

102111-hw4-f011 - Department of Chemical Engineering...

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Department of Chemical Engineering Fall, 2011 University of California, Santa Barbara 1 CHE 140B Problem Set No. 4 Due Tuesday, October 25, 2011 Problem 1: Schmidt, 7.37(a) The catalytic dehydrogenation of ethane on supported Pt catalysts proceeds through the reaction steps: (1) C 2 H 6 (g) + S   C 2 H 6s   26 11 1 1 CH j rk P k    (2) C 2 H 6s + 2S C 2 H 4s + 2H s   2 22 1 j (3) C 2 H 4s C 2 H 4 (g) + S  24 33 3 1 j k P (4) 2H s H 2 (g) + 2S 2 2 2 44 4 1 H Hj k P (a) Formulate a reasonable rate expression assuming that step (2) is irreversible and slow compared to the adsorption-desorption steps. Problem 2: Fogler, 10-8 In 1981, the U.S. government put forth the following plan for automobile manufacturers to reduce emissions from automobiles over the next few years. Year 1981 1993 2004 Hydrocarbons 0.41 0.25 0.125 CO 3.4 3.4 1.7 NO 1.0 0.4 0.2 All values are in grams per mile. An automobile emitting 3.74 lb of CO and 0.37 lb of NO on a journey of 1000 miles would meet the current government requirements.
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102111-hw4-f011 - Department of Chemical Engineering...

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