Catalytic low-temperature combustion of dichloromethane over V–Ni/TiO2 catalyst

Abstract

Vanadium–nickel mixed oxides supported on TiO₂ (anatase) were prepared by wet impregnation using ammonium metavanadate and nickel nitrate aqueous solution. The performance of as-prepared samples in catalytic dichloromethane (DCM) combustion was investigated, and their physicochemical properties were characterized in detail by X-ray diffraction, N₂ physisorption, H₂ temperature-programmed reduction, NH₃ temperature-programmed desorption, and Raman spectroscopy analyses. Results showed DCM combustion activity over V–Ni/TiO₂ catalyst was superior to that of V₂O₅/TiO₂ and NiO/TiO₂ catalysts. DCM could be completely converted into CO₂, HCl, and a little amount of CO over Ni–V/TiO₂ catalyst at 350 °C, the toxic by-products, such as CH₃Cl, aldehydes and phosgene could not be observed by online IR spectroscopy. The high catalytic activity, selectivity, and stability of V–Ni/TiO₂ catalyst could be due to the good oxidative dehydrogenation ability (ODH), the good reducibility of active oxygen species, and suitable strength of Lewis acidic sites upon introduction of nickel oxide.