110711hw6 f011

110711hw6 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. 6 Due Tuesday, November 15, 2011 Problem 1: Fogler, 12.3(a-f,h,i) The catalytic reaction A B takes place within a fixed bed containing spherical porous catalyst X22. Figure P12-3 shows the overall rates of reaction at a point in the reactor as a function of temperature for various entering total molar flow rates, F T 0 . Express all of your written responses using complete sentences . (a) Is the reaction limited by external diffusion? Explain your reasoning. (b) If your answer to part (a) was "yes," under what conditions [of those shown (i.e., T , F T 0 )] is the reaction limited by external diffusion? Explain your reasoning. (c) Is the reaction "reaction-rate-limited"? Explain your reasoning. (d) If your answer to part (c) was "yes," under what conditions [of those shown (i.e., T , F T 0 )] is the reaction limited by the rate of the surface reactions? Explain your reasoning. (e)
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110711hw6 f011 - Department of Chemical Engineering...

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