Which outcome occurs when a platinum catalyst in a hydrogenation reactor becomes poisoned by sulfur compounds?

💡 Explanation

When a catalyst is poisoned, sulfur bonds preferentially to the active sites on the platinum surface because sulfur's electron affinity is higher, thereby blocking reactant adsorption and reducing the effective catalyst concentration. Therefore the hydrogenation rate decreases, rather than increased temperature, alkane selectivity, or area increase, which depend on alternative process failures.

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