ChE 442_FALL 2004_FINALS

ChE 442_FALL 2004_FINALS - Ch.E 442 FINAL EXAMINATION FALL...

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Ch.E. 442 FINAL EXAMINATION FALL 2004 Student Name:
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PROBLEM 1: In a series of experiments the catalyst particle diameter was varied and the reaction rate was measured. One could distinguish three different regions of behavior, as shown below. Explain the observed experimental behavior. Indicate which step (surface kinetics, internal diffusion, external mass transport) is rate limiting in each region . Explain why. 0 1 2 3 4 5 6 7 8 9 10 11 12 0 1 2 3 4 5 6 7 8 9 10 11 12 r cr dp
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In another series of experiments temperature was varied and the reaction rate was measured. The experimental behavior is shown below. Again, explain the observed experimental behavior. Indicate which step (surface kinetics, internal diffusion, external mass transport), if any, is rate limiting in each region . Explain why.
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PROBLEM 2: The following catalytic reaction A B B obeys the following mechanism : . . . . a a r r b b k k k k k k A S A S A S B S B S B S - - - + + Derive an expression for the overall rate of reaction at steady state. Note that for this reaction mechanism one cannot identify a single rate limiting/controlling step.
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ChE 442_FALL 2004_FINALS - Ch.E 442 FINAL EXAMINATION FALL...

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