Simultaneous abatement of NO and N2O with CH4 over Pt,Pd,Rh/TiO2-ZrO2 and Pt,Pd,Rh/TiO2-ZrO2-CeO2 catalysts

NO and N2O emissions represent a worldwide problem of immense concern and many efforts are devoted to their catalytic abatement. Pt, Pd and Rh metal-based catalysts, most used in Three- Way-Catalytic Converter (TWC) for gasoline engines, can be of interest also for the simultaneous abatement of NO and N2O formed in industrial processes, such as nitric and adipic acid plants, where they are actually removed sequentially. The catalytic behaviour of Pt,Pd,Rh/TiO2-ZrO2 and Pt,Pd,Rh/TiO2- ZrO2-CeO2 catalysts for the simultaneous reduction of NO and N2O using CH4 as reductant in the presence of different amounts of O2 (SCRsim) was investigated. These catalysts were characterized with several techniques (XRF, XRD, BET, in situ and operando-FTIR, FESEM-EDAX, TPR-TPO).