Which mechanism allows a nickel catalyst to accelerate hydrogenation reactions at lower temperatures?

💡 Explanation

When nickel facilitates hydrogenation, it lowers the activation energy by forming metal-hydride intermediates because reactant adsorption orients and weakens bonds, speeding up the reaction. Therefore a metal-hydride intermediate enables the reaction to proceed at lower temperatures, rather than vibrational increase, improved solubility, or enhanced heat transfer occurring through unrelated mechanisms.

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