Removal of NO by CH4 using CuO/TiO2-γ-Al2O3 catalyst in combination with

Cu-based catalysts supported on 15% TiO2/gamma-Al2O3 carrier, was prepared by precipitation method. BET and XRD results show that the pore size distributions of 15% TiO2/gamma-Al2O3, were mainly between micropores and meso-pores, and the CuO crystal diffraction peaks were detected, respectively. By using a hybrid system integrating plasma activation and a 12% CuO/TiO2/gamma-Al2O3 catalyst, the reactions of NO + CH4 + O-2 were studied under different conditions including plasma only, catalyst only and plasma with catalyst. It is found that only plasma existed, the NO and CH,conversion increased with a higher plasma power supply, and the addition of 2.5% O-2 increased NO and CH4 conversion. Only when catalysts eristed, the NO and CH4 conversion both increased with the increase of temperature and reached 30% and 20%, respectively. And at the same time, the NO conversion was increased first with O-2 content increasing and then decreased, and CH4 conversion was increased with O-2 content increasing. When both plasma and catalyst coexisted, the conversion trend of the NO and CH4 with variation of O-2 content was consistent with that when only catalyst existed. Besides, the NO conversion was in the range from 15% to 35% and the low temperature NO conversion was obviously increased. For the CH4 conversion, it was increased greatly to 90%.