MHT CET202124 Sep 2021Evening ShiftChemistrySurface ChemistryActual
Which of the following is a first step in mechanism of heterogenous catalysis?
Options
- ADesorption of reaction product from catalyst surface
- BAdsorption of reactant molecules on catalyst surface to form an intermediate
- COccurrence of chemical reaction on catalyst surface to form an intermediate
- DDiffusion of reactants towards catalyst surface
Correct answer
D. Diffusion of reactants towards catalyst surface
Step-by-step solution
The catalytic activity is localised on the surface of the catalyst. The mechanism involves five steps: (i) Diffusion of reactants to the surface of the catalyst. (ii) Adsorption of reactant molecules on the surface of the catalyst. (iii) Occurrence of chemical reaction on the catalyst surface, through formation of an intermediate. (iv) Desorption of reaction products away from the catalyst surface. (v) Diffusion of reaction products away from the catalyst surface.