Abstract: The experiment of selective catalytic reduction of NO_○x with CO in flue gas at low temperature was carried out. The study focused on the effect of action temperature， the load proportion of active metal and the type of active metals on the denitrification efficiency and the conversion of CO. The results show that， within the experimental temperature range， with the rise of reaction temperature， the NO conversion with Cu-Co/Al₂O₃ catalyst increases， the conversion of NO increases at first and then decreases with Cu-Mn/Al₂O₃ catalyst， and the conversion of CO increases. In the experimental conditions， as the load proportion of active metal changes， when the m(Cu)/m(Co) and m(Cu)/m(Mn) is 1.5， the catalyst has the best denitrification efficiency. The overall NO conversion with Cu-Mn/Al₂O₃ is better than that with Cu-Co/Al₂O₃. Comprehensive comparison of the eight catalysts shows that the Cu-Mn/Al₂O₃ catalyst with 1.5 load proportion of active metal has the best denitrification efficiency at 160℃.

Key words: low temperature, carbon monoxide (CO), selective catalytic reduction (SCR), denitrification, catalyst