Recent Advances on Synergistic Catalytic Removal of Chlorinated Volatile Organic Pollutants and NOx
Chlorinated volatile organic compounds (CVOCs) are typical halogenated organic pollutants frequently coexisting with nitrogen oxides (NOx) in flue gases from thermal industrial processes such as waste incineration and metal smelting. The synergistic catalytic removal of these co-pollutants offers substantial environmental benefits and engineering potential. This review focuses on the regulation of catalyst acidity and redox properties, systematically summarizing the synergistic mechanisms between CVOCs catalytic oxidation and NH3-selective catalytic reduction (NH3-SCR) for NOx removal. Special attention is given to reaction pathways governing chlorine species desorption and intermediate mineralization during CVOCs oxidation, alongside intrinsic strategies for broadening the SCR temperature window, enhancing N2 selectivity, and mitigating catalyst deactivation. Key challenges in simultaneous removal include competitive adsorption of coexisting pollutants, chlorine poisoning of catalysts, formation of polychlorinated byproducts, and interference from other flue gas components. Future research directions are proposed, encompassing interfacial mechanistic elucidation, innovative design of multifunctional catalytic sites, and technological transition from laboratory-scale studies to industrial applications. This review provides theoretical insights and technical guidance for integrated control of multiple pollutants.