催化学报

催化学报 ›› 2009, Vol. 30 ›› Issue (5): 459-464.

• 研究论文 • 上一篇    下一篇

硫酸化对In/SO42–/TiO2催化剂上CH4选择性催化还原NOx的促进机理

荆国华 1, 2, 李俊华 1, 杨栋 1, 郝吉明 1   

  1. 1清华大学环境科学与工程系, 北京 100084 2华侨大学环境科学与工程系, 福建厦门 361021
  • 收稿日期:2009-05-25 出版日期:2009-05-25 发布日期:2013-02-05

Promotional Mechanism of Sulfation on Selective Catalytic Reduction of NOx by Methane Over In/SO42–/TiO2

JING Guohua1, 2, LI Junhua1,*, YANG Dong1, HAO Jiming1   

  1. 1Department of Environmental Science and Engineering, Tsinghua University, Beijing 100084, China 2Department of Environmental Science and Engineering, Huaqiao University, Xiamen 361021, Fujian, China
  • Received:2009-05-25 Online:2009-05-25 Published:2013-02-05

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摘要： 考察了 In/SO42–/TiO2 (In/STi)催化剂上甲烷选择性催化还原(CH4-SCR)NOx 的活性, 分析了硫酸化对催化活性的促进作用. 结果表明, 硫酸化影响了 In 在催化剂表面的存在形态和 CH4 的活化产物, 从而提高了催化剂活性. 吡啶红外光谱分析表明, 硫酸化后的 STi 载体可提供足够强度的 B 酸位, 有利于活性中心 InO+物种的形成. 原位红外光谱分析表明, In/TiO2 催化剂上 CH4 的活化产物为完全氧化的 CO2 和 H2O, 而硫酸化后的 In/STi 催化剂上 CH4 的活化产物为 HCOO–, 该物种被认为是 CH4-SCR 反应的重要中间体, 它的生成为 In/STi 催化剂上 CH4-SCR 反应的速控步骤.

关键词: 甲烷, 选择性催化还原, 氮氧化物, 固体超强酸, 硫酸化, 二氧化钛

Abstract: The catalytic performance and the promotional mechanism of sulfation on selective catalytic reduction of NO by CH4 over sulfated titanium-loaded In (In/STi) were investigated. An enhancement of catalytic activity was obtained over the In/STi catalysts. The distinguish reaction intermediates of CH4-SCR of NO over the sulfated and unsulfated catalysts were revealed by DRIFTS analysis.

Key words: methane, selective catalytic reduction, nitric oxide, solid super acid, sulfation, titanic oxide