CeOx对低温选择性催化还原脱硝催化剂FeOx-MnOx/TiO2的改性研究  

Influence of CeOx modification on the properties of FeOx-MnOx/TiO2 catalysts for low-temperature selective catalytic reduction denitrification

作　　者：肖雨亭 吴鹏[2] 王玲[2] 张亚平[2] XIAO Yuting;WU Peng;WANG Ling;ZHANG Yaping(Jiangsu Longyuan Catalysts Co.,Ltd.,Wuxi Jiangsu 214123;Key Laboratory for Energy Thermal Conversion and Control of Ministry of Education,Southeast University,Nanjing Jiangsu 210096)

机构地区：[1]江苏龙源催化剂有限公司,江苏无锡214123 [2]东南大学能源热转换及其过程测控教育部重点实验室,江苏南京210096

出　　处：《环境污染与防治》2020年第1期17-22,共6页Environmental Pollution & Control

基　　金：国家重点研发计划项目（No.2017YFB0603201）;江苏省重点研发计划项目（No.BE2017716）

摘　　要：制备了不同CeOx负载量的(CeOx)n-(FeOx)0.1-(MnOx)0.4/TiO2催化剂(n、0.1、0.4分别为CeOx、FeOx、MnOx与载体TiO2的摩尔比),用于低温选择性催化还原(SCR)脱硝,并对其进行结构和性能的表征。结果表明,适量负载CeOx能够显著提高催化剂的低温SCR脱硝催化活性。当n=0.07时,催化剂在160~180℃时的催化活性最高,脱硝效率可以达到99%以上。同时,水蒸气、SO2体积分数分别小于等于10%、0.02%时,该催化剂有较好的抗水性和抗硫性。表征结果显示,(CeOx)0.07-(FeOx)0.1-(MnOx)0.4/TiO2催化剂锐钛矿TiO2的相对结晶度低,耗氢还原峰温度低,并且面积大,表面Lewis酸位上的NH3稳定。因此,(CeOx)0.07-(FeOx)0.1-(MnOx)0.4/TiO2催化剂具有良好的低温SCR脱硝活性,并且稳定。A series of(CeOx)n-(FeOx)0.1-(MnOx)0.4/TiO2(n,0.1and 0.4were molar ratios of CeOx,FeOx and MnOx to TiO2,respectively)catalysts with different CeOxloadings were prepared for low-temperature selective catalytic reduction(SCR)denitrification.And the catalysts were characterized.Results showed that appropriate CeOx doping could significantly improve the SCR denitrification activity.When n=0.07,the catalyst had the highest denitrification activity of above 99% at temperatures of 160-180℃.When the volume fraction of water vapor and SO2 were not over 10%and 0.02%,respectively,this catalyst had excellent water and sulfur resistance.Characterization results indicated such catalyst had low degree of crystallization,broad H2-consuming reduction peaks areas at low temperature and stable NH3 on Lewis acid sites.Thus,(CeOx)0.07-(FeOx)0.1-(MnOx)0.4/TiO2 had good lowtemperature SCR catalytic activity and stable property.

关 键 词：FeOx-MnOx/TiO2 CeOx 低温选择性催化还原 脱硝 

分 类 号：X701[环境科学与工程—环境工程]