催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (2): 104-110.

• 研究论文 • 上一篇    下一篇

整体式MnOx-CeO2/ZrO2-TiO2催化剂用于NH3低温选择性催化还原NO

李伟,林涛,张秋林,龚茂初,陈耀强   

  1. 四川大学绿色化学与技术教育部重点实验室, 成都 610064
  • 收稿日期:2009-02-25 出版日期:2009-02-25 发布日期:2012-11-21

Low-Temperature Selective Catalytic Reduction of NO with NH3 over MnOx-CeO2/ZrO2-TiO2 Monolith Catalyst

LI Wei, LIN Tao, ZHANG Qiulin, GONG Maochu, CHEN Yaoqiang*   

  1. Key Laboratory of Green Chemistry and Technology of the Ministry of Education, Sichuan University, Chengdu 610064, Sichuan, China
  • Received:2009-02-25 Online:2009-02-25 Published:2012-11-21

PDF

797

被引次数

85

摘要： 以MnOx为活性组分, CeO2为助剂, ZrO2-TiO2为载体制备了MnOx-CeO2/ZrO2-TiO2整体式催化剂,考察了焙烧温度对该催化剂上NH3低温选择性催化还原反应(NH3-SCR)的影响. 通过X射线衍射、比表面积测定、储氧量测定和X射线光电子能谱等手段对催化剂进行了表征. 结果表明,催化剂的织构性能和储氧量对低温NH3-SCR反应有较大的影响,活性组分锰以+3价和+4价共存时具有最好的低温活性. 该催化剂经600 ℃焙烧后,在空速为36000h-1时,反应有最低的起燃温度160 ℃和很宽的反应温度窗口176～393 ℃(转化率为60%～95%). 该催化剂在固定源,尤其在移动源柴油车上催化净化氮氧化物具有良好的应用前景.

关键词: 低温选择性催化还原, 氧化锰, 氧化铈, 氧化锆, 二氧化钛, 复合氧化物, 整体式催化剂, 氮氧化物

Abstract: The catalysts of MnOx-CeO2/TiO2 (T) and MnOx-CeO2/ZrO2- TiO2 (ZT) were prepared by calcination at different temperatures (500, 600 , 7 00, and 800 ℃). Compared with the T catalysts, ZT catalysts exhibit better low -temperature SCR activity, wider reaction temperature window, and higher NO co nversion. ZT6 (MnOx-CeO2/ZrO2-TiO2 calcined at 600 ℃) showed the best low-temperature SCR activity and favorable stability at high temperature.

Key words: low-temperature selective catalytic reduction, manganese oxide, ceria, zirconium dioxide, titania, composite oxide, monolith catalyst, nitrogen oxide