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Which risk increases when a molecular sieve operating under high vacuum?

A)Framework degradation through repeated dehydration
B)Olefin polymerization within sorbent pores
C)Reduced performance due to increased diffusion
D)Lower strength diminishes structural stability

💡 Explanation

Framework collapse risk increases because dehydration at high vacuum imposes extra stress on the molecular sieve structure, due to the removal of stabilizing water molecules. Therefore degradation risk rises, rather than another form of instability which occurs under high stress.

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