Question

Write short notes of Catalytic poison. Give example.

Answer 1

Catalytic poisons are those substances which inhibit or distroy the activity of the catalyst by their presence.

Example :-

1) The platinum catalyst used in the oxidation of hydrogen is poisoned by CO.

2) The activity of Iron catalyst is distroyed by the presence of $H_{2}S$ or $CO$ in synthesis of ammonia by Haber's process.

3) The presence of traces of $A{S}_2{O}_3$ in the reacting gases reduces the activity of platinized asbestos which is used as catalyst in manufacture of $H_{2}S{O}_4$ in contact process.