Question

Explain catalytic poisoning with example.

Answer 1

Catalytic poisoning refers to the decrease (or destruction) of catalyst activity.
For example, $A{s}_2{O}_3$ reduces the $Pt-$asbestos activity in contact process for the manufacture of sulphuric acid.
$CO$ or hydrogen sulphide decreases the activity of the iron catalyst in the Haber process for the manufacture of ammonia.