The catalyst deactivation caused by deposition on surface and pores of catalyst is called ____

(a) Adsorption

(b) Regeneration

(c) Fouling

(d) Desorption

I had been asked this question by my school teacher while I was bunking the class.

My question is taken from Mechanisms of Catalyst Deactivation topic in division Suspended Solid Reactors, Catalyst Deactivation, Diffusion and Reaction of Chemical Reaction Engineering

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