| 硫酸化对In/SO_4~(2-)/TiO_2催化剂上CH_4选择性催化还原NO_x的促进机理 |
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| 引用本文： | 荆国华,李俊华,杨栋,郝吉明.硫酸化对In/SO_4~(2-)/TiO_2催化剂上CH_4选择性催化还原NO_x的促进机理[J].催化学报,2009,30(5). |
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| 作者姓名： | 荆国华 李俊华 杨栋 郝吉明 |
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| 作者单位： | 1. 清华大学环境科学与工程系,北京,100084;华侨大学环境科学与工程系,福建厦门,361021
2. 清华大学环境科学与工程系,北京,100084 |
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| 基金项目： | 国家自然科学基金，国家高技术研究发展计划(863计划) |
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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.
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| 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 |
Promotional Mechanism of Sulfation on Selective Catalytic Reduction of NO_x by Methane Over In/SO_4~(2-)/TiO_2 |
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| JING Guohua,LI Junhua,YANG Dong,HAO Jiming.Promotional Mechanism of Sulfation on Selective Catalytic Reduction of NO_x by Methane Over In/SO_4~(2-)/TiO_2[J].Chinese Journal of Catalysis,2009,30(5). |
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| Authors: | JING Guohua LI Junhua YANG Dong HAO Jiming |
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| Institution: | JING Guohua1,2,LI Junhua1,YANG Dong1,HAO Jiming1 1Department of Environmental Science , Engineering,Tsinghua University,Beijing 100084,China 2Department of Environmental Science , Engineering,Huaqiao University,Xiamen 361021,Fujian,China |
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| Abstract: | The catalytic performance and the promotional mechanism of sulfation for selective catalytic reduction of NO by CH4 over sul-fated titanium-loaded In(In/STi) were investigated.An enhancement of catalytic activity was obtained over the In/STi catalysts.Sulfation influenced the existent state of surface indium species and determined the activation species of CH4.Py-IR analysis showed that the sulfated In/STi catalyst had strong Br?nsted acid sites,which were beneficial to the formation of active InO+ species.... |
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| Keywords: | methane selective catalytic reduction nitric oxide solid super acid sulfation titanic oxide |
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