Which of the following is a first step in mechanism of heterogenous catalysis?
Which of the following is a first step in mechanism of heterogenous catalysis?
Desorption of reaction product from catalyst surface
Adsorption of reactant molecules on catalyst surface to form an intermediate
Occurrence of chemical reaction on catalyst surface to form an intermediate
Diffusion of reactants towards catalyst surface
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.