Question

How can we increase the ageing of alumina-silica catalyst?

(a) By making the contact of catalyst with heavy metals

(b) By making the contact of catalyst with lighter metals

(c) By making the contact of catalyst with heavy non-metals

(d) By making the contact of catalyst with lighter non-metals

I have been asked this question in class test.

Origin of the question is Cracking topic in division Fuels and Combustion of Engineering Chemistry II

Answer 1

Right answer is (b) By making the contact of catalyst with lighter metals

Best explanation: The process of ageing can be accelerated, if the catalyst comes into the contact with compounds containing sulphur, vanadium, nickel etc. The ageing can also be increased if the conditions are more rigid.