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-MB

The zero-order reaction A B is carried out in a moving-bed reactor containing 1 kg of catalyst. The catalyst decay is also zero-order. The entering molar flow rate is pure A at 1 mol/min. Given the following information:

  • The product sells for $160 per gram mole.
  • The cost of operating the bed is $10 per kilogram of catalyst exiting the bed.
  1. What is the feed rate of solids (kg/min) that will give the maximum profit? (Ans: US = 4 kg/min)

  2. What are the activity and conversion exiting the reactor at this optimum? (Note: For the purposes of this calculation, ignore all other costs, such as the cost of the reactant, etc.)

  3. Redo parts (a) and (b) for the case when kr = 5 mol/kg cat.min and the reactant and catalyst are fed to opposite ends of the bed.

Additional Information:
Specific reaction rate: kr = 1.0 mol/kg cat.min
Decay constant: kd = 2.0 min-1

[3rd Ed. P10-18]