102511-hw5-f011

102511-hw5-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. 5 Due Tuesday, November 1, 2011 Problem 1: Hill, 6-10 The water-gas shift reaction takes place on a platinum catalyst in a batch reactor at 1000 °C. The overall reaction is CO 2 + H 2 H 2 O + CO . No products other than H 2 O or CO are formed. In a series of experiments in which the initial CO 2 pressure was held constant (and in substantial excess over hydrogen), the rate of formation of CO was found to be directly proportional to the pressure of H 2 . In another series of experiments, the initial partial pressure of H 2 was held constant at 100 mm Hg, and the following partial pressures of CO were found after a reaction time of 120 sec. Initial pressure CO 2 CO pressure after 120 sec (mm Hg) (mm Hg) 25 3.8 50 7.0 75 10.0 100 12.4 125 14.4 150 16.2 175 17.5 200 18.0 225 17.8 250 17.3 300 15.4 The CO was found to have a negligible retarding influence on the rate of reaction. In all
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102511-hw5-f011 - Department of Chemical Engineering...

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