Mn-Ce-Co/TiO_2催化剂低温脱硝活性研究  

Study on the DeNO_x activity of the Mn-Ce-Co/TiO_2 catalyst at low temperature

作　　者：于国峰[1] 韦彦斐[2] 金瑞奔[2] 朱虹[2] 顾震宇[2] 潘理黎[1] 

机构地区：[1]浙江工业大学环境工程系,杭州310014 [2]浙江省环境保护科学设计研究院,杭州310007

出　　处：《环境科学学报》2012年第7期1743-1749,共7页Acta Scientiae Circumstantiae

基　　金：浙江省环境污染控制研究重点实验室资助项目~~

摘　　要：以纳米TiO2为载体,通过浸渍法制备一系列改性Mn-Ce/TiO2脱硝催化剂.通过实验考察不同元素组分催化剂的脱硝活性,同时探讨金属氧化物掺杂对提高催化剂低温脱硝活性的机理.活性测试结果显示,Co掺杂能最有效地提高Mn-Ce/TiO2催化剂在低温段的SCR脱硝活性,在n(Co):n(TiO2)=0.08～0.10、体积空速为35100h-1的条件下,催化剂在120℃时就能达到80%以上的NO去除率,140℃左右时的NO去除率接近100%.BET、XRD、TPR、TPD等表征测试结果表明,Co掺杂可改进Mn-Ce/TiO2催化剂的物化特性,增加催化剂表面的活性酸位点及活性氧数量,提高催化剂的氧化还原能力,从而提高Mn-Ce/TiO2催化剂低温SCR脱硝活性.A series of Mn-Ce/TiO2 catalysts was prepared by impregnation method with TiO2 as the carrier.Results of DeNOx activity tests indicated that Co doping could most significantly enhance the low-temperature SCR activity of the catalyst.It was showed that the most active Mn-Ce mixed-oxide catalyst with a Co loading of 0.08～0.10 yielded 80% NO conversion at 120 ℃ to 100% at 140 ℃ with the space velocity of 35100 h-1.These catalysts were characterized by surface area measurement（BET）,x-ray diffraction（XRD） and temperature programmed desorption（TPD）.The results showed that the surface acidity and the oxygen storage capacity of the Mn-Ce/TiO2 catalyst were improved by the introduction of Co.Temperature programmed reduction（TPR） results verified that the redox property of Mn-Ce/TiO2 was enhanced by Co doping.Therefore,Ce modification could effectively enhance the low-temperature SCR activity of Mn-Ce/TiO2.

关 键 词：选择性催化还原(SCR) 低温 活性 Mn-Ce-Co/TiO2催化剂 

分 类 号：X701[环境科学与工程—环境工程]