Basic oxygen furnace steelmaking leads to the production of CO-rich off-gas.When CO and NO are combined in off-gas,selective catalytic reduction by CO(CO-SCR)effectively achieves the synergistic removal of both pollut...Basic oxygen furnace steelmaking leads to the production of CO-rich off-gas.When CO and NO are combined in off-gas,selective catalytic reduction by CO(CO-SCR)effectively achieves the synergistic removal of both pollutants.In this paper,CuCe_(0.75)Zr_(0.25)O_(y),MnCe_(0.75)Zr_(0.25)O_(y),and FeCe_(0.75)Zr_(0.25)O_(y) catalysts are prepared and evaluated for their CO-SCR activity,and the results show that the reaction system needs to be anaerobic;thus,the CO-SCR reaction can be dominant.The T_(90) values of CuCe_(0.75)Zr_(0.25)O_(y) and FeCe_(0.75)Zr_(0.25)O_(y) are 200℃ and 223℃,respectively.The activities of these two catalysts are higher than that of MnCe_(0.75)Zr_(0.25)O_(y)(T_(90)=375℃).Linear nitrate and bridged bidentate nitrate are the main intermediate species involved in NO conversion on the catalyst surface,and bidentate CO_(3)^(2-)coordination is the main intermediate species involved in CO conversion on the catalyst surface.CuCe_(0.75)Zr_(0.25)O_(y) has high lattice oxygen mobility and is more likely to react with NO and CO.In the presence of oxygen,most CO is oxidized by O_(2),which increases continuously to 100%,100%,and 98%for CuCe_(0.75)Zr_(0.25)O_(y),FeCe_(0.75)Zr_(0.25)O_(y),and MnCe_(0.75)Zr_(0.25)O_(y),respectively;additionally,CO is oxidized by O_(2),and the CO-SCR reaction cannot be carried out.展开更多
基金financially supported by the National Natural Science Foundation of China(51776216)The Science and Technology Development Fund,Macao SAR(File no.0041/2019/A1 and 0046/2019/AFJ)+1 种基金University of Macao(File no.MYRG2017-00216-FST)University of Macao(File no.MYRG2018-00192-IAPME).
文摘Basic oxygen furnace steelmaking leads to the production of CO-rich off-gas.When CO and NO are combined in off-gas,selective catalytic reduction by CO(CO-SCR)effectively achieves the synergistic removal of both pollutants.In this paper,CuCe_(0.75)Zr_(0.25)O_(y),MnCe_(0.75)Zr_(0.25)O_(y),and FeCe_(0.75)Zr_(0.25)O_(y) catalysts are prepared and evaluated for their CO-SCR activity,and the results show that the reaction system needs to be anaerobic;thus,the CO-SCR reaction can be dominant.The T_(90) values of CuCe_(0.75)Zr_(0.25)O_(y) and FeCe_(0.75)Zr_(0.25)O_(y) are 200℃ and 223℃,respectively.The activities of these two catalysts are higher than that of MnCe_(0.75)Zr_(0.25)O_(y)(T_(90)=375℃).Linear nitrate and bridged bidentate nitrate are the main intermediate species involved in NO conversion on the catalyst surface,and bidentate CO_(3)^(2-)coordination is the main intermediate species involved in CO conversion on the catalyst surface.CuCe_(0.75)Zr_(0.25)O_(y) has high lattice oxygen mobility and is more likely to react with NO and CO.In the presence of oxygen,most CO is oxidized by O_(2),which increases continuously to 100%,100%,and 98%for CuCe_(0.75)Zr_(0.25)O_(y),FeCe_(0.75)Zr_(0.25)O_(y),and MnCe_(0.75)Zr_(0.25)O_(y),respectively;additionally,CO is oxidized by O_(2),and the CO-SCR reaction cannot be carried out.
