The sequence of steps in a heterogeneous catalytic reaction is ____(a) Diffusion → Adsorption → Reaction → Desorption → Diffusion → Mass transfer → Mass transfer(b) Mass transfer → Diffusion → Adsorption → Reaction → Desorption → Diffusion → Mass transfer(c) Mass transfer → Diffusion → Adsorption → Desorption → Diffusion → Mass transfer → Reaction(d) Mass transfer → Adsorption → Diffusion Reaction → Desorption → Diffusion → Mass transferI got this question in a job interview.My question comes from Packed Bed Catalytic Reactor in portion Packed Bed Catalytic Reactor, Fluidised Bed and Transport Reactors of Chemical Reaction Engineering

The sequence of steps in a heterogeneous catalytic reaction is ____(a)

1.	The sequence of steps in a heterogeneous catalytic reaction is ____(a) Diffusion → Adsorption → Reaction → Desorption → Diffusion → Mass transfer → Mass transfer(b) Mass transfer → Diffusion → Adsorption → Reaction → Desorption → Diffusion → Mass transfer(c) Mass transfer → Diffusion → Adsorption → Desorption → Diffusion → Mass transfer → Reaction(d) Mass transfer → Adsorption → Diffusion Reaction → Desorption → Diffusion → Mass transferI got this question in a job interview.My question comes from Packed Bed Catalytic Reactor in portion Packed Bed Catalytic Reactor, Fluidised Bed and Transport Reactors of Chemical Reaction Engineering
Answer» The correct answer is (b) Mass TRANSFER → Diffusion → Adsorption → Reaction → DESORPTION → Diffusion → Mass transfer Easiest explanation: The catalytic reaction OCCURS by the mass transfer to the catalytic surface, followed by the diffusion of the reactant gas through the PRODUCT layer. Reaction occurs at the gas – catalyst interface. Diffusion of the product gas occurs through the product layer. Mass transfer of the product gas occurs BACK through the gas film.

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