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Which catalyst doesn’t have high tolerance towards S when it is reactivated with steam in catalytic cracking process?

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Which catalyst doesn’t have high tolerance towards S when it is reactivated with steam in catalytic cracking process?

(a) Iron

(b) Chromium

(c) Copper

(d) Nickel

I had been asked this question in an interview.

I need to ask this question from Natural Products in section Natural Products of Chemical Technology

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Right option is (b) Chromium

The explanation is: Chromium doesn’t have high tolerance towards S when it is reactivated with steam in catalytic cracking process. Catalyst must be selected in such a way that it is not poisoned by metals.

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