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Which outcome sharply limits catalytic activity inside a fuel reformer?

A)Catalyst surface poisoning by sulfur
B)Reversal of water-gas shift reaction
C)Excessive steam short-contact time
D)Diffusion limited molecular interactions

💡 Explanation

Catalyst activity plummets due to catalyst surface poisoning because strong chemical adsorption blocks active sites on the catalyst; therefore reaction rate drops significantly, rather than activity increasing, because other side-reactions become dominant when the primary surface is blocked.

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