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Which constraint on hydrogen production increases when catalytic reactors experience sulfur poisoning?

A)Active catalyst site availability
B)Reactor wall heat transfer
C)Feedstock vapor compression ratio
D)Mechanical vibrational resonance frequency

💡 Explanation

Sulfur poisoning decreases availability because sulfur atoms preferentially bond to catalytic surfaces, blocking hydrogen formation via catalytic dehydrogenation involving surface adsorption; therefore activity drops rather than changing mechanical or thermal behaviors.

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