高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (7): 1105.

• 论文 • 上一篇    下一篇

In/HZSM-5催化剂上CH4选择还原NO机理研究

王晓东2, 马磊2, 张涛1,2, 包信和1, 孙孝英2, 梁东白2, 林励吾1   

  1. 1. 催化基础国家重点实验室;
    2. 环境工程研究室, 中国科学院大连化学物理研究所, 大连 116023
  • 收稿日期:1999-08-25 出版日期:2000-07-24 发布日期:2000-07-24
  • 通讯作者: 张　涛(1963年出生),男,博士,研究员,博士生导师,从事催化化学研究.E-mail:taozhang@dicp.ac.cn

Mechanismic Studies on the Selective Reduction of NO by CH4 over an In/HZSN-5 Catalyst

WANG Xiao-Dong2, MA Lei2, ZHANG Tao1,2, BAO Xin-He1, SUN Xiao-Ying2, LIANG Dong-Bai2, LIN Li-Wu1   

  1. 1. State Key Laboratory of Catalysis;
    2. Laboratory of Environmental Engineering, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
  • Received:1999-08-25 Online:2000-07-24 Published:2000-07-24

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摘要： 考察了CH4+O2,NO+CH4(+O2)与NO2+CH4(+O2)反应体系中CH4的转化活性.结果表明,浸渍法制备的In/HZSM5催化剂上CH4选择还原NO过程中,NO2的形成起到了活化甲烷的作用.根据NO和NO2在In/HZSM5与HZSM5样品上的TPD及IR研究结果,认为在载体HZSM5的酸性位及In/HZSM5催化剂的活性中心In位上均可形成NO2,NO2与CH4的反应在In位上进行.

关键词: 机理, 选择还原, 氧化氮, 甲烷, In/HZSM-5

Abstract: CH4 oxidations in CH4+O2, NO+CH4(+O2) and NO2+CH4(+O2) reaction systems over the catalyst of indium impregnated on HZSM-5(In/HZSM-5) were studied. The efficacies of O2, NOand NO2 for CH4 oxidation were evaluated. The dramatically different conversions of CH4 in these different reaction systems suggested that NO2 played a key role in CH4 conversion. TPDstudies of CH4, O2, NOand NO2 on HZSM-5 and In/HZSM-5 were also investigated. It was found that only NOx could absorb on the samples and the chemisorbed amount of NO2 was much larger than that of NO. This illustrated that the absorbed NO2 species were very important in the CH4-SCRprocess. Our TPDresults and IRresults from the literatures both indicated that not only the acid sites but also the In sites in the In/HZSM-5 catalyst facilitated the formation of NO2. Moreover, the reaction between NO2 and CH4 took place on the In sites.

Key words: Mechanism, Selective reduction, Nitrogen oxide, Methane, Indium/HZSM-5

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