V2O5-CeO2/TiO2催化剂上低温氨选择性催化还原NO的性能

考察了V2O5-CeO2/TiO2催化剂中V、Ce活性组分的担载量和焙烧温度对催化剂低温催化还原NO活性的影响及其在单独SO2、H2O和两者共存气氛下的抗毒化性能。结果表明，焙烧温度400℃下制备的5V30Ce/TiO2催化剂具有良好的低温催化还原NO活性，空速为10000h-1，165℃时NO转化率达99.2%；500℃以下低焙烧温度时，添加的Ce不与V相互作用，在催化剂表面主要以CeO2形式存在，有利于增大催化剂比表面积，增强V2O5在催化剂上的分散度，提高催化活性。而在500℃以上较高焙烧温度下，Ce与V会形成CeVO4，对活性提高不利。催化剂具有良好的低温抗水中毒性能，但受SO2毒化作用明显，其在SO2、H2O共存气氛下中毒程度较单独SO2下浅。

Low temperature selective catalytic reduction of NO by ammonia over V2O5-CeO2/TiO2

Low temperature selective catalytic reduction of NO by NH3 over V2O5-CeO2/TiO2 was investigated with or without H2O and SO2. Results show that 5V30Ce/TiO2 prepared at 400℃ has high reaction activity, and its NO conversion is 99.2% under the conditions of 10000h-1 and 165℃. When the calcination temperature is below 500℃, Ce does not interact with V and CeO2 is the major existence form at the catalyst surface, which can increase the catalyst surface area and V2O5 dispersion to enhance the catalytic activity. Above 500℃, CeVO4 can be formed and it can decrease the activity. The performance of V2O5-CeO2/TiO2 is superior to resist water poisoning, and the deactivation degree under SO2 is more serious than that under SO2 and H2O.