基于过氧钛系的SCR低温催化剂性能研究  

Performance Comparison of Different Low-temperature SCR Catalysts Based on Peroxotitanium-complex

作　　者：赵金笑[1] 仲兆平[1] 姚杰[1] 

机构地区：[1]东南大学能源热转换及其过程测控教育部重点实验室能源与环境学院,南京210096

出　　处：《华东电力》2012年第3期502-507,共6页East China Electric Power

基　　金：江苏省科技支撑计划工业部分项目(BE2010184);江苏省环保科研课题(201031)~~

摘　　要：以工业级偏钛酸为原料制备过氧钛系溶胶(PTC)作为SCR催化剂载体前驱物,选取6种金属元素及其组合作为活性组分,研究SCR低温催化剂的性能。低于220℃时,所有催化剂的脱硝效率都随着反应温度提高而增加。对于单活性组分催化剂,最高脱硝效率依次为98.7%(Ce/TiO2)>92.4%(Mn/TiO2)>89.7%(Fe/TiO2)>83.6%(Cu/TiO2)>66.8%(Zr/TiO2),低于200℃时Mn/TiO2的脱硝性能最佳。因此,基于Mn/TiO2分别掺杂了Ce、Cu和W,最高脱硝效率依次为97.3%(Mn-Ce/TiO2)>93.9%(Mn-Cu/TiO2)>90.0%(Mn-Ce-Cu/TiO2)>86.1%(Mn-W/TiO2)。分别掺杂Ce或Cu都能提高Mn/TiO2性能,同时掺杂却会产生抑制。基于上述结果,进行了BET、SEM及XRD的表征。结果表明,自制载体为锐钛型纳米TiO2,比表面积较大;不同催化剂的低温脱硝性能相差较大,Mn-Ce/TiO2被认为是较有前景的活性组分组合。In this research,the industrial-grade H2TiO3 was utilized to prepare peroxotitanium complex（PTC）,applied as the selective catalytic reduction（SCR） low-temperature catalyst＇s support precursor.The properties of SCR were studied with six metal elements and their combinations selected as active components.When the temperature was lower than 220℃,the DeNOx efficiency of all catalysts increased with the temperature.Among the single active component catalysts,the highest DeNOx efficiency ranked by： 98.7%（Ce /TiO2） 92.4%（Mn /TiO2） 89.7%（Fe / TiO2） 83.6%（Cu /TiO2） 66.8%（Zr /TiO2）.The optimal Mn /TiO2 DeNOx efficiency occurred when the temperature was lower than 200℃.Based on the performance comparison under low temperature,cerium,copper and tungsten were chosen as the bimetallic choice on Mn /TiO2.Among the bimetallic catalysts,the highest DeNOx efficiency ranked by： 97.3%（Mn-Ce /TiO2） 93.9%（Mn-Cu /TiO2） 90.0%（Mn-Ce-Cu /TiO2） 86.1%（Mn-W/TiO2）. Separate addition of cerium or copper would be helpful for increasing Mn /TiO2 performance.However,adding both cerium and copper would inhibit the DeNOx performance.Characterization as BET,SEM and XRD were carried out based on the DeNOx performace tests.Results showed that when the self-made carrier was anatase TiO2,the specific surface area was larger.The active component affected the DeNOx performance directly and Mn-Ce /TiO2 is considered as a promising combination.

关 键 词：低温催化剂 选择性催化还原 过氧钛系 溶胶凝胶法 

分 类 号：X701.3[环境科学与工程—环境工程]