Abstract
NH3 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 NH3 emissions caused by ammonia escaping from mobile and industrial sources can effec-tively reduce the NH3 content in ambient air.Among the various NH3 removal methods,the selective catalytic oxygen method(NH3-SCO)is committed to oxidizing NH3 to environmentally harmless H2O and N2;therefore,it is the most valuable and ideal ammonia removal method.In this review,the charac-teristics of loaded and core-shell catalysts in NH3-SCO have been reviewed in the context of catalyst structure-activity relationships,and the H2O resistance and SO2 resistance of the catalysts are discussed in the context of practical application conditions.Then the effects of the valence state of the active cen-ter,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 sum-marized and the catalyst development is discussed based on the existing studies.
基金项目
国家自然科学基金(52000093)
Yunnan Fundamental Research Projects(202101BE070001-001)
National Engineering Laboratory for Mobile Source Emission Control Technology(NELMS2019B03)
NETL
NSTL
万方数据