Plasma-assisted CuO/CeO2/TiO2-γ-Al2O3 catalysts for NO+CH4 reaction and NO temperature programmed desorption studies

Abstract The removal of NO and CH 4 has been studied with a hybrid system integrating plasma activation and four Cu-based catalysts. The best catalytic performance was observed for catalysts obtained from CuO/CeO 2 /TiO 2 /γ-Al 2 O 3 .The efficiency of NO removal decreased with the order: 12%CuO/10%CeO 2 /15%TiO 2 /γ-Al 2 O 3 > 12%CuO/15%TiO 2 /γ-Al 2 O 3 > 12%CuO/γ-Al 2 O 3 > 12% CuO/TiO 2 . Brunauer–Emmett–Teller (BET), X-ray diffraction (XRD) Temperature-programmed reduction (H 2 -TPR) and NO temperature-programmed desorption (NO-TPD) experiments were carried out to gain insight into the synergetic effects with the catalysts. The results revealed that copper species existed as bulk CuO crystalline for all the catalysts, H 2 -TPR suggested that the Cu 2+ incorporated TiO 2 or CeO 2 lattice and crystalline CuO might be the most active component for NO removal, and NO-TPD studies indicated that 12%CuO/10%CeO 2 /15%TiO 2 /γ-Al 2 O 3 catalyst had lower NO desorption temperature and larger peak area, which seemed to be responsible for the better catalytic activity over NO + CH 4 reactions than other catalysts.