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

NH3 -SCR is an environmentally important reaction for the abatement of NO x from different resources. MnO2 -based catalyst has attracted significant attention due to the excellent activity. In this paper, a series of MnWO x /TiO2 -SiO2 catalysts were prepared by liquid-phase deposition method. The catalysts were characterized by N2 adsorption/desorption, XRD, TEM, XPS, FT-IR, H2 -TPR, TG and water adsorption capacity. The existence of SiO2 improved the SO2 and H2 O resistance of the MnWO x /TiO2 -SiO2 catalyst without decreasing the NH3 -SCR activity. Under the reaction conditions of 260°C and 60 000 ml gcata 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 /TiO2 -SiO2 catalyst is considered to be originated from the texture properties and active species dispersion improvement by SiO2 in the support and low-temperature preparation.