Question

A substance which increases the efficiency of a catalyst is known as ___________________.

Answer 1

Promoter :

• A substance that increases the efficiency of a catalyst is known as a promoter.
• For example Molybdenum($\mathrm{Mo}$) acts as a promoter during the manufacture of ammonia(${\mathrm{NH}}_3$)

Therefore, a substance that increases the efficiency of a catalyst is known as promoter.