高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (5): 897.

• 研究论文 • 上一篇    下一篇

稀土氧化物上SO2和NO的催化还原(Ⅲ)──用CO作还原剂的同步脱硫和脱氮

王磊, 马建新, 谢敏明, 张益群, 周 伟   

  1. 华东理工大学工业催化研究所, 上海 200237
  • 收稿日期:2000-12-14 出版日期:2002-05-24 发布日期:2002-05-24
  • 通讯作者: 马建新(1954年出生),男,博士,教授,博士生导师,主要从事环境催化研究.E-mail:jxma@ecust.edu.cn E-mail:jxma@ecust.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:29777008)资助.

Catalytic Reduction of SO2 and NO by CO on Rare Earth Oxides(Ⅲ)──Simultaneous Reduction by Using CO as Reducing Agent

WANG Lei, MA Jian-Xin, XIE Min-Ming, ZHANG Yi-Qun, ZHOU Wei   

  1. Institute of Industrial Catalysis, East China University of Science &, Technology, Shanghai 200237, China
  • Received:2000-12-14 Online:2002-05-24 Published:2002-05-24

摘要: 考察了稀土系列氧化物作为CO同步还原SO2和NO催化剂的活性.结果表明,氧化钐和氧化钕表现了最高的活性,在475℃,SO2和NO的转化率同时超过95%.实验发现稀土氧硫化物是活性相.通常脱硫活性高的样品同样具有高的脱氮活性,但CeO2表现了不同的行为,其脱硫活性虽低,但脱氮活性却较高.文中还对同步反应的机理作了探讨,发现COS不仅是还原SO2的中间物,同时也是还原NO的中间物.结合活性相和反应机理对不同稀土氧化物的活性差异作了讨论.

关键词: 催化还原, 脱硫, 脱氮, 稀土氧化物, 稀土氧硫化物

Abstract: Rare earth oxysulfides obtained from the activation of rare earth oxides were effective catalysts for the simultaneous reduction of SO2 and NO by COto elemental S.The most active catalysts were Sm2O2S and Nd2O2S, over which a conversion of >95% for both SO2 and NO was obtained at 475 .Exceptional behavior was observed over CeO2,which showed a low activity for desulfurization, but a high activity for denitrification.The seperating experimental results showed that GOS was an intermediate not only for the reduction of SO2 by CO but also for the reduction of NO by CO.Thus, a COSintermediate mechanism was proposed to describe the simultaneous reaction.Based on the mechanism, the difference a-mong the activities of the rare earth oxides was discussed.

Key words: Catalytic reduction, Desulf urization, Denitrification, Rare earth oxide, Rare earth oxysulfide

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