中文摘要：

以Ti OSO4·2H2O和Ce（NO3）3·6H2O为前驱体,采用共沉淀法制备了不同Ce O2含量的Ce O2-Ti O2复合氧化物催化剂.对样品结构进行了表征,考察了催化剂的NH3-SCR（NH3选择性催化还原）反应活性、N2选择性和抗水抗硫性能.结果表明,随着催化剂中Ce O2含量的增加,催化剂的物相结构、晶粒尺寸及脱硝性能均出现规律性变化,这种改变与样品的酸碱性和氧化还原性能的变化有关.当样品中Ce O2的质量分数约为50%时,催化剂的结构呈无定形态,具有较大的比表面积和较多的氧空位,有利于反应物分子在催化剂表面的吸附和活化,拓宽了催化剂的低温活性窗口并提高了NO的转化率.

英文摘要：

A series of CeO2-TiO2 mixed oxides catalysts prepared by Co-precipitation method was investigated on selective catalytic reduction （SCR） of NOx with NH3. The properties of the catalysts were characterized using XRD, BET, XRF, XPS, Hz-TPR, NH3-TPD and NO＋O2-TPD techniques. The results indicated that the crystal structure, crystallite size and catalytic NH3-SCR activity over the catalysts presented a regular change with the increase of CeO2 concentration. Particularly, the 50CeTi catalyst with amorphous structure of CeOz-TiO2 showed a higher BET surface area and a stronger surface acidity than other samples. Meanwhile, favorable Ce3＋ and the surface adsorbed oxygen benefited the adsorption of NOx and NH3 molecules, which enhanced DeNOx performance.