Several types of catalysts work effectively under mild conditions: - Enzymes: Biological catalysts operate efficiently at ambient temperatures and neutral pH levels, making them ideal for mild conditions. - Homogeneous Catalysts: Many transition metal complexes can catalyze reactions at low temperatures and pressures. - Heterogeneous Catalysts: Certain solid catalysts, such as zeolites and metal-organic frameworks (MOFs), are designed to function under mild conditions.