研究报告
于国峰,韦彦斐,金瑞奔,朱虹,顾震宇,潘理黎.Mn-Ce-Co/TiO2催化剂低温脱硝活性研究[J].环境科学学报,2012,32(7):1743-1749
Mn-Ce-Co/TiO2催化剂低温脱硝活性研究
- Study on the DeNOx activity of the Mn-Ce-Co/TiO2 catalyst at low temperature
- 基金项目：浙江省环境污染控制研究重点实验室资助项目
- 作者
- 单位
- 于国峰
- 浙江工业大学 环境工程系,杭州 310014
- 韦彦斐
- 浙江省环境保护科学设计研究院,杭州 310007
- 金瑞奔
- 浙江省环境保护科学设计研究院,杭州 310007
- 朱虹
- 浙江省环境保护科学设计研究院,杭州 310007
- 顾震宇
- 浙江省环境保护科学设计研究院,杭州 310007
- 潘理黎
- 浙江工业大学 环境工程系,杭州 310014
- 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35100 h-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.
- Abstract：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.
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