Synergistic Catalytic Elimination of NO x and Chlorinated Organics: Cooperation of Acid Sites.

The synergistic catalytic removal of NO x and chlorinated volatile organic compounds under low temperatures is still a big challenge. Generally, degradation of chlorinated organics demands sufficient redox ability, which leads to low N 2 selectivity in the selective catalytic reduction of NO x by NH 3 (NH 3 -SCR). Herein, mediating acid sites via introducing the CePO 4 component into MnO 2 /TiO 2 NH 3 -SCR catalysts was found to be an effective approach for promoting chlorobenzene degradation. The observation of in situ diffuse reflectance infrared Fourier transform ( in situ DRIFT) and Raman spectra reflected that the Lewis acid sites over CePO 4 promoted the nucleophilic substitution process of chlorobenzene over MnO 2 by weakening the bond between Cl and benzene ring. Meanwhile, MnO 2 provided adequate Brønsted acid sites and redox sites. Under the cooperation of Lewis and Brønsted acid sites, relying on the rational redox ability, chlorobenzene degradation was promoted with synergistically improved NH 3 -SCR activity and selectivity. This work offers a distinct pathway for promoting the combination of chlorobenzene catalytic oxidation and NH 3 -SCR, and is expected to provide a novel strategy for synergistic catalytic elimination of NO x and chlorinated volatile organic compounds.