What are promoters? Explain with example.

Explanation

(i) In a catalysed reaction, the presence of a certain substance increases the activity of a catalyst. Such substance is called a promoter.
(ii) For example, in Haber.s process of manufacture of ammonia, the activity of the iron catalyst is increased by the presence of molybdenum. Hence molybdenum is called in promoter.
`N_(2(g))+3H_(2(g))overset(Fe//Mo)rarr 2NH_(3(g))" "{:("Fe - catalyst"),("Mo - promoter"):}`