新型CuSO4-CeO2/TS催化剂低温NH3还原NO及抗中毒性能  

Performance of a Novel CuSO_4-CeO_2/TiO_2-SiO_2 Catalyst for NO Reduction with NH_3 at Low Temperature

作　　者：何勇[1] 童华[2] 童志权[1] 黄妍[1] 夏斌[1] 

机构地区：[1]湘潭大学环境科学与工程系,湖南湘潭411105 [2]北京化工大学环境工程系,北京100029

出　　处：《过程工程学报》2009年第2期360-367,共8页The Chinese Journal of Process Engineering

基　　金：湖南省自然科学基金资助项目(编号:07JJ4003)

摘　　要：采用共沉淀法制备了载体TiO2-SiO2(TS),用浸渍法制备了CuSO4-CeO2/TS催化剂,研究了制备参数和操作条件对其低温NH3选择性催化还原NO性能的影响及其抗H2O和SO2中毒的能力.结果表明,在最佳条件下制得的CuSO4-CeO2/TS,在反应温度220℃、NH3/NO摩尔比为1.1、进口NO浓度1000×10-6(φ)、空速5000h-1及O24%(φ)条件下,NO转化率接近98%.本催化剂低温下具有良好的单独抗水、硫的能力,且在长达33h同时抗H2O和SO2的过程中,其活性保持在约95%的高水平,没有中毒迹象,在综合性能上优于目前文献报道的其他SCR催化剂.CuSO4-CeO2/TS catalyst impregnated on TiO2-SiO2 （TS） support prepared by coprecipitation method was investigated for the influences of the preparation parameters and operating conditions on the activities in selective catalytic reduction （SCR） of NO with NH3 at low temperature. The resistance to poisoning of H20 and SO2 was also studied. The results showed that about 98% NO conversion rate was achieved over CuSO4-CeO2/TS catalyst at 220 ℃ with a space velocity of 5 000 h^-1, in the presence of 4% O2, molar ratio of NH3/NO 1.1. The catalyst showed not only high resistance to H2O or SO2, but also the superior activity in the coexistence of H2O and SO2. The NO conversion rate of the catalyst remained high level about 95% during 33 h SCR reaction in the presence of H2O and SO2, and there was no sign of poisoning. The anti-poisoning performance of catalyst was superior to those of other catalysts reported in the literature.

关 键 词：硫酸铜 二氧化铈 TIO2-SIO2 氨气选择性催化还原 一氧化氮 水 二氧化硫 

分 类 号：X5[环境科学与工程—环境工程]