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What are promoters?...

What are promoters?

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Give an example. Ans. A substance which, though itself not a catalyst, promotes the activity of a catalyst is called a promoter. Eg: In the Haber's process for the synthesis of ammonia, traces of molybdenum increase the activity of finely divided iron which acts as a catalyst.
`N_2 + 3H_2 underset(+Mo)overset(Fe)(iff) 2NH_3`
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