中文摘要：

采用溶胶凝胶法制备TiO2-ZrO2载体,然后采用柠檬酸溶液浸渍法制备Cr-MnOx/TiO2-ZrO2复合催化剂.通过X射线衍射、比表面积测试（BET）、扫描电镜、X射线光电子能谱等测试方法对催化剂的物化性能进行表征分析,并进行NH3选择性催化还原NO实验,考察催化剂在低温下的活性及抗硫抗水性能.Cr元素介入到MnOx中,形成了新型的CrMn1.5O4活性物相,其中的Mn元素多以Mn^3＋和Mn^4＋存在.高价态的Cr^5＋使Mn元素由Mn^3＋向高氧化态的Mn^4＋转化,有利于低温选择性催化还原反应的进行.鉴于Cr元素第一电离能和电负性均低于Mn元素,能优先于Mn与SO4^2-和SO3^2-结合,保护MnOx不被硫酸化,从而提高Cr-MnOx/TiO2-ZrO2催化剂的抗毒性能.制备的五种不同Cr/（Cr＋Mn）摩尔比的催化剂中,Cr（0.4）-MnOx/TiO2-ZrO2的性能最优,其颗粒分散均匀,具有较大比表面积,在180℃时脱硝效率能够达到95.8%,同时通入5%H2O和10-4SO2,脱硝效率缓慢下降,反应8h后,下降到73%,并保持稳定.

英文摘要：

Using a sol-gel prepared TiO2-ZrO2 carrier,Cr-MnOx/ TiO2-ZrO2composite catalysts were synthesized by a critic acid solution impregnation method. The physical and chemical properties of the catalysts were characterized by X-ray diffraction,specific surface area determination（ BET）,scanning electron microscopy and X-ray photoelectron spectroscopy. Meanwhile,the lowtemperature catalytic activity and the sulfur and water resistance were evaluated with selective catalytic reduction（ SCR） of NOby NH＋3. The introduction of Cr element to MnOxyields a new CrMn1.5O4 active phase,in which Mn primarily exists as Mn3 and Mn^4＋.The Cr^5＋ valence state facilitates the transformation of Mn^3＋ to high oxidation state Mn^4＋,which is beneficial to the low temperature SCR reaction. Because of lower first ionization energy and electronegativity,Cr preferentially reacts with SO2-4and SO2-3than Mn,thus protecting MnOx not to be sulphatized and resulting in the enhanced antitoxic performance of Cr-MnOx/ TiO2-ZrO2. Among the prepared five catalysts with different molar ratios of Cr /（ Cr ＋ Mn）,Cr（ 0. 4）-MnOx/ TiO2-ZrO2 demonstrates the best performance owing to the largest surface area and the best particle dispersion,and a 95. 8% denitrification efficiency can be achieved at 180 ℃.When 5% H2O and 10-4SO2 are simultaneously added,the denitrification efficiency decreases slowly and stabilizes at 73% after 8h reaction.