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← ScienceWhich consequence results when excessive zinc ions poison a palladium catalyst during methanol synthesis?
A)Equilibrium shifts favoring CO2
B)Increased catalyst surface area
C)Lower syngas conversion rate✓
D)Exothermic reaction becomes endothermic
💡 Explanation
Decreased methanol production occurs because zinc blocks active sites through *chemisorption inhibition*, reducing the effective catalyst surface. Therefore, the reaction rate decreases rather than equilibrium shifts, because zinc prevents binding, other enthalpy changes.
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