中文摘要：

首次采用低温固相法制备了无载体MnOx催化剂并将其用于NOx的低温NH3选择性催化还原．该催化剂为晶化度极低的混合锰氧化物，部分为粒径40～60nm的棒状晶体颗粒，其余是更细小的无定形颗粒；催化剂的BET比表面积为150．8m^2／g，吸附能力较强，NOx吸附量可达138．27μmol／g．在模拟尾气试验条件下，MnOx催化剂的低温活性很高，80℃时NOx转化率即可达到98．25％；反应产物N2选择性高于96．6％；当通人0．01％SO2和10％H2O后，由于竞争吸附导致NOx转化率有所下降，但仍可保持在70％左右，且不利影响在停止添加SO2和H2O后逐渐消失．

英文摘要：

A manganese oxide catalyst MnOx was prepared by the low-temperature solid phase reaction method and used for the low-temperature selective catalytic reduction （SCR） of NOx with NH3. The X-ray diffraction results show that MnOx is a mixture of manganese oxides with poor crystallinity, which contains rodlike crystal particles （40-60 nm） and more fine amorphous particles. The BET specific surface area of the MnOx is 150.8 m^2/g, more great than that of other unsupported catalysts ever reported, and thus its capability of adsorption is superior. In our experiments, the amount of adsorbed NOx reaches 138.27μmol/g. The SCR results show that the MnOx is an efficient catalyst for the SCR of NOx at low temperature. A NOx conversion of 98.25% and product selectivity for N2 of 96.6 % was obtained at 80 ℃. The addition of 0.01% SO2 and 10 % H2O weakens the adsorption of NOx by competition on the catalyst surface, which decreases the NOx. conversion to 70 % after reaction for 2.5 h. The catalyst activity can be recovered after the removal of SO2 and H2O.