Reduction of NO2 in Flue Gas by CO and Propylene over CuO-CeO2/SiO2 in the Presence of O2

摘要

Catalytic reduction of NO2 with CO and/or propylene in the presence of NO and excess oxygen,a model mixture for flue gas,was studied over a series of CuO-CeO2/SiO2 catalysts between 120-260℃.The effect of HC1,an impurity in flue gas,on the activity of the catalysts was evaluated.It was found that a binary oxide catalyst,2% CuO-8% CeO2/SiO2,was active for the reduction of NO2 by CO and/or propylene.CO was effective for selective reduction of NO2 in the presence of NO and O2 in a temperature window between 160-200 ℃ while propylene was effective at temperature higher than 200 ℃.In the presence of HC1,the activity of the catalyst for reduction of NO2 with CO was irreversibly deactivated.However,the activity for reduction of NO2 with propylene was not influenced by HC1.