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Chemical Reaction Engineering
Reaction Kinetics
GATE 2017
Easy

For a first-order catalytic reaction in a porous pellet (R=characteristic length, De=effective diffusivity, k1=rate constant based on pellet volume, Cs=surface concentration), the Thiele modulus is

  • AkcR/De
  • R√(k1/De)
  • CR√(k1Cs/De)
  • DR√(De/k1)

Explanation

The standard first-order Thiele modulus is φ=R√(k1/De).

Source: GATE CH 2017 (2017)

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