Why is heating or cooling required in packed beds if we don’t use it as a heat exchanger?

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1.	Why is heating or cooling required in packed beds if we don’t use it as a heat exchanger?
A.	To Cool Exothermic reactions
B.	To cool water by using ice as pellets
C.	To cool petroleum by using ice as pellets
D.	To heat exothermic reactions
Answer» B. To cool water by using ice as pellets

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