Several types of catalysts are utilized in pollution abatement, including: - Heterogeneous Catalysts: Solid catalysts that interact with gaseous or liquid reactants. Common examples include platinum, palladium, and rhodium used in automotive catalytic converters. - Homogeneous Catalysts: Catalysts that are in the same phase as the reactants, often used in liquid-phase reactions for the removal of organic pollutants. - Enzymatic Catalysts: Biological catalysts that can degrade pollutants under mild conditions, often used in bioremediation.