催化学报

催化学报 ›› 2008, Vol. 29 ›› Issue (6): 531-536.

• 研究论文 • 上一篇    下一篇

氧化还原沉淀法制备MnOx-SnO2催化剂及其对NO的NH3选择催化还原性能

唐幸福,李俊华,魏丽斯,郝吉明   

  1. 清华大学环境科学与工程系, 北京 100084
  • 收稿日期:2008-06-25 出版日期:2008-06-25 发布日期:2012-04-28

MnOx-SnO2 Catalysts Synthesized by a Redox Coprecipitation Method for Selective Catalytic Reduction of NO by NH3

TANG Xingfu, LI Junhua, WEI Lisi, HAO Jiming*   

  1. Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China
  • Received:2008-06-25 Online:2008-06-25 Published:2012-04-28

PDF

1045

被引次数

80

摘要： 采用氧化还原共沉淀法制备了MnOx-SnO2复合氧化物,并将其用于低温NH3选择催化还原NO反应. 结果表明, Mn/(Mn+Sn)摩尔比为75%的催化剂具有最好的低温催化活性,在120～200 ℃温度范围内得到100%的NO转化率. 氮吸附-脱附、X射线衍射和X射线光电子能谱测试表明,高比表面积、Mn-Sn固溶体的形成和高氧化态的Mn物种是催化剂催化活性较高的主要原因.

关键词: 氧化锰, 氧化锡, 复合氧化物, 氨, 选择催化还原, 一氧化氮, 低温, 氧化还原共沉淀法

Abstract: MnOx-SnO2 composite oxides prepared by a redox coprecipitation route were tested in selective catalytic reduction of NO by NH3 at low temperature. The results showed that the MnOx-SnO2 catalyst with a Mn/(Mn+Sn) molar ratio of 75% exhibted the best performance, on which NO conversion of 100% could be achieved at temperatures of 120-200 ℃. The characterization results of N2 adsorption-desorption,X-raydiffraction, andX-rayphotoelectron spectroscopy indicated that the higher surface area, the formation of solid solution between manganese and tin oxides, and the high oxidation state manganese species were responsible for the high catalytic activity of the MnOx-SnO2 catalyst.

Key words: manganese oxide, tin oxide, composite oxide, ammonia, selective catalytic reduction, nitric oxide, low temperature, redox coprecipitaition