Ce Modification on Mn/TiO_2/cordierite Monolithic Catalyst for Low-temperature NO_x Reduction

Cordierite monolithic catalysts were prepared firstly by sol-gel method for TiO 2 / cordierite,then by impregnation method for Mn-Ce / TiO 2 / cordierite monolithic catalyst and used for low-temperature selective catalytic reduction(SCR) of NO x with ammonia.The results indicated that the activity of catalysts significantly improved after Ce doping.The conversion of NO could be improved by doping Ce from 71.1% to 97.6% at 120 ℃ with a gas hourly space velocity(GHSV) of 6000 h-1.The catalyst of adding proper Ce had larger specific surface area and pore volume.The XPS,NH3adsorption and NO oxidation tests showed that the catalyst of adding proper Ce contained higher levels of Mn 4+ and more chemical adsorption oxygen,which promoted NH 3 adsorption and NO oxidation activity.These factors may lead to the increasing of the SCR activity on Mn-Ce / TiO 2 / CC catalyst.