闫东杰,徐颖,黄学敏,玉亚,刘树军.制备条件对低温NH3-SCR脱硝催化剂Mn-Ce/TiO2结构与性能的影响[J].环境科学学报,2015,35(6):1697-1702
制备条件对低温NH3-SCR脱硝催化剂Mn-Ce/TiO2结构与性能的影响
- Effect of preparation conditions on structures and performance of Mn-Ce/TiO2 catalyst for low-temperature NH3-SCR
- 基金项目：陕西省教育厅科研计划项目(No.14JK1392);国家自然科学基金(No.51408455)
- 闫东杰
- 西北水资源与环境生态教育部重点实验室, 西安建筑科技大学环境与市政工程学院, 西安 710055
- 徐颖
- 西北水资源与环境生态教育部重点实验室, 西安建筑科技大学环境与市政工程学院, 西安 710055
- 黄学敏
- 西北水资源与环境生态教育部重点实验室, 西安建筑科技大学环境与市政工程学院, 西安 710055
- 玉亚
- 西北水资源与环境生态教育部重点实验室, 西安建筑科技大学环境与市政工程学院, 西安 710055
- 刘树军
- 西北水资源与环境生态教育部重点实验室, 西安建筑科技大学环境与市政工程学院, 西安 710055
- 摘要：采用溶胶凝胶法制备了Mn-Ce/TiO2催化剂,以NH3为还原剂,通过程序升温反应考察其选择性催化还原NO的催化性能.同时,着重探讨了焙烧温度、焙烧时间、活性物质负载量及Mn、Ce 负载比例对催化剂结构和性能的影响,并用BET、XRD等对催化剂进行了表征.结果表明,活性组分负载量由0增至20%时,NO转化率随着负载量的增加而提高,当(Mn+Ce)质量分数为20%,催化剂活性最高,此后随着活性组分负载量的增加,NO转化率明显下降;Mn与Ce的负载比例为0.85 ∶ 0.15时,催化剂比表面积最大,为112.31 m2 · g-1;焙烧温度500 ℃时催化剂晶相均为TiO2锐钛矿型结构,焙烧温度升高至600 ℃,催化剂晶相为TiO2锐钛矿型和金红石型混合结构,且催化剂比表面积急剧减小;焙烧时间对催化剂晶相结构影响不大,焙烧时间为5 h时,Mn-Ce/TiO2的脱硝性能最好.
- Abstract：A manganese and cerium oxide catalyst was prepared through the sol-gel method and used for the low-temperature selective catalytic reduction (SCR) of NO with NH3. The influence of molar ratio of Mn and Ce, loadings of Mn and Ce, calcination temperature, and calcination time on the conversion of NO and NH3 over Mn-Ce/TiO2 were investigated. The catalysts were characterized by X-ray diffraction (XRD) and BET surface area. The results showed that when the loadings of Mn and Ce was lower than 20%, the conversion of NO increased along with the loadings; when the mass fraction of Mn and Ce reached 20%, the selective catalytic reduction (SCR) activity of catalyst was the highest, and the conversion of NO decreased when the loadings was larger than 20%. And the specific surface area of catalyst was the largest which achieved 112.31 m2 · g-1 when the ratio of Mn and Ce was 0.85 ∶ 0.15. When the calcination temperature was 500 ℃, the TiO2 phase structure was anatase, and the anatase-rutile mixture of TiO2 would be formed when the calcination temperature increased to 600 ℃, which caused sharp drop of the specific surface area of the catalyst. The calcination time had little effect on the crystalline phase structure, and the catalyst activity was the highest when calcination time was 5 h.
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