Discussion
A non-catalytic fluid solid reaction differs from a catalytic one in that
Answer: A
Correct answer: the solid is consumed by the reaction
A catalyst is unchanged by the reaction it promotes and can in principle serve indefinitely; in a non-catalytic fluid–solid reaction the solid is a reactant and is used up. Ore roasting, coal combustion and the calcination of limestone are all of this kind, and the consequence is that the particle changes with time - which is what the shrinking core model exists to describe.
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