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In which form does the catalyst are used in fluid-bed cracking?

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in Engineering Chemistry II by (789k points)
In which form does the catalyst are used in fluid-bed cracking?

(a) In the form of oxides

(b) In the form of vapours

(c) Liquid form

(d) In the form of fine powder

This question was posed to me during an online interview.

I'm obligated to ask this question of Cracking topic in chapter Fuels and Combustion of Engineering Chemistry II

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Right choice is (d) In the form of fine powder

Easiest explanation: In this process, the catalyst in the form of fine powder is circulated through the cracking reactor with the help of oil vapours. The catalyst accelerates and directs the cracking and also acts as a heat transfer medium.

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