Question:
I think catalyst is only used to enhance the rate of reaction but not reaction to occur ,then why we should use high temperature and pressure in the catalytic hydrogenation of alkenes with Ni catalyst instead of pt and pd catalysts
Answer:
Catalysts enhance the rate of reaction by binding to the reactant and decreasing the activation energy for the reaction to occur. This binding of catalyst to the reactant molecules depends on its structure, and also the temperature and pressure conditions.
Thus for hydrogenation of alkenes, Ni has been observed to be a suitable catalyst for provising a surface for adsorption of hydrogen in comparison to Pt or Pd.
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