Advances in selective catalytic oxidation of ammonia (NH 3-SCO): A review of catalyst structure-activity relationship and design principles

NH 3 in ambient air directly leads to an increase in the aerosol content in the air. These substances lead to the formation of haze to various environmental problems after atmospheric circulation and diffusion. Controlling NH 3 emissions caused by ammonia escaping from mobile and industrial sources can effectively reduce the NH 3 content in ambient air. Among the various NH 3 removal methods, the selective catalytic oxygen method (NH 3 -SCO) is committed to oxidizing NH 3 to environmentally harmless H 2 O and N 2 ; therefore, it is the most valuable and ideal ammonia removal method. In this review, the characteristics of loaded and core-shell catalysts in NH 3 -SCO have been reviewed in the context of catalyst structure-activity relationships, and the H 2 O resistance and SO 2 resistance of the catalysts are discussed in the context of practical application conditions. Then the effects of the valence state of the active center, oxygen species on the catalyst surface, dispersion of the active center and acidic sites on the catalyst performance are discussed comprehensively. Finally, the shortcomings of the existing catalysts are summarized and the catalyst development is discussed based on the existing studies.(c) 2023 Published by Elsevier B.V. on behalf of Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences.