Microwave Irradiation-Selective Catalytic Reduction of NO to N2 by Activated Carbon at Low Temperature

Activated carbon (AC) supported ceria and mixed metal oxides MeOx-CeO2 (Me = Ni, Mn, Fe) were investigated for microwave irradiation-selective catalytic reduction (MW-SCR) of NO in the microwave catalytic reaction mode (MCRM). NO conversion almost reached 100% for 5% (21% NiOx)-CeO2/AC at 300 degrees C, 5% (21% MeOx)-CeO2/AC (Me = Mn, Fe) and 5% CeO2/AC at 350 degrees C in the MCRM. The temperature of NO removal by SCR using AC as reductant in the MCRM was usually lowers 150-200 degrees C than that of in the conventional reaction mode (CRM). These results suggested that microwave irradiation could efficiently improve the activity of NO removal at low temperature and decrease the reaction temperature of NO with AC. MW-SCR of NO by AC primarily produced N-2 and CO2, and O-2 existence had no influence on the activity of NO removal by AC in the MCRM. These results show that microwave irradiation exhibit the microwave catalytic effect and microwave selective effect. This method of MW-SCR is a viable and promising method for flue-gas such as NO, N2O, and SO2 control.