TiO 2 –SiO 2 supported MnWO x catalysts by liquid-phase deposition for low-temperature NH 3 -SCR

NH 3 -SCR is an environmentally important reaction for the abatement of NO x from different resources. MnO 2 -based catalyst has attracted significant attention due to the excellent activity. In this paper, a series of MnWO x /TiO 2 –SiO 2 catalysts were prepared by liquid-phase deposition method. The catalysts were characterized by N 2 adsorption/desorption, XRD, TEM, XPS, FT-IR, H 2 -TPR, TG and water adsorption capacity. The existence of SiO 2 improved the SO 2 and H 2 O resistance of the MnWO x /TiO 2 –SiO 2 catalyst without decreasing the NH 3 -SCR activity. Under the reaction conditions of 260°C and 60 000 ml g cata h −1 gas hourly space velocity (GHSV), the NO conversion was kept stable at about 95% for 140 min on stream. The excellent performance of MnWO x /TiO 2 –SiO 2 catalyst is considered to be originated from the texture properties and active species dispersion improvement by SiO 2 in the support and low-temperature preparation.