Several factors influence the effectiveness of a catalyst:
1. Surface Area: For heterogeneous catalysts, a larger surface area provides more active sites for the reaction. 2. Temperature: Higher temperatures can increase reaction rates but may also lead to catalyst deactivation. 3. Pressure: In gas-phase reactions, higher pressure can drive reactants into contact with the catalyst. 4. Presence of Inhibitors: Substances that adsorb strongly to the catalyst surface can block active sites and reduce effectiveness.