Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 10: Catalysis and Catalytic Reactors

Additional Homework Problems

CDP10-SB

  The elementary gas-phase reaction
   

image 10eq25.gif

     
   

is carried out in a moving-bed reactor in which there is a significant pressure drop and significant catalyst decay. The decay is first-order. Pure A enters the reactor at a temperature of 400 K, a concentration of 2 mol/dm 3 , and a molar feed rate of 4 mol/s at a pressure of 50 atm. The pressure at the exit of the reactor is 5 atm. The catalyst loading is such that the catalyst activity at the exit of the reactor is 0.1. There is 100 kg of catalyst in the reactor.

(a) What is the conversion at the exit of the reactor?


uacd10-6.gif

(b) Calculate the conversion at two or three catalyst weights, and then use these points to sketch the conversion of A down the length of the reactor.
The specific reaction rate at 400 K is 0.09 dm 3 / molmiddots.
(c) How would your answers change if the catalyst and reactants were fed to opposite ends of the reactor?

[Final Exam, Winter 1994]