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.

• Which risk increases when a water-filled, sealed vessel undergoes rapid volume expansion?
• Which outcome occurs when an organic photovoltaic's active region's morphology causes poorly overlapping orbitals?
• Which consequence results when a closed-cycle heat engine exceeds its cooling capacity?
• Which mechanism limits the maximum writing speed in CD-R drives when laser intensity is increased?
• Which outcome occurs when rapid adiabatic expansion causes steam to cross the saturation curve?
• Which outcome disables a turbine when experiencing icing?