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Which consequence results when surface ligand π* antibonding orbitals excessively mix with metal d-orbitals in a catalyst particle?

A)Increased catalytic turnover frequency
B)Decreased catalyst-substrate binding
C)Enhanced metal-ligand backbonding
D)Accelerated oxidative catalyst degradation

💡 Explanation

Accelerated oxidative catalyst degradation occurs because increased π* orbital mixing enhances electron donation to the metal core, increasing its electron density. This weakens metal-ligand bonds, triggering decomposition, therefore accelerating catalyst degradation, rather than improving activity.

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