物理化学学报 >> 1996, Vol. 12 >> Issue (06): 513-517.doi: 10.3866/PKU.WHXB19960607

研究论文 上一篇    下一篇

Mo2N的表面性质和加氢脱氮活性

王新平,张文郁,任铁力,金恒芳,辛勤   

  1. 中国科学院大连化学物理研究所催化基础国家重点实验室，大连 116023|内蒙古工业大学，呼和浩特 010062
  • 收稿日期:1995-11-20 修回日期:1996-03-04 发布日期:1996-06-15
  • 通讯作者:

Surface Properties and HDN Activity of Mo2N

Wang Xin-Ping,Zhang Wen-Yu,Ren Tie-Li,Jin Heng-Fang,Xin Qin   

  1. State Key Laboratory of Catalysis,Dalin Institute of Chemical Physics Chinese Academy of Sciences,Dalian 116023;|The Inner Mongolia Polytechnic University,Huhehot 010062
  • Received:1995-11-20 Revised:1996-03-04 Published:1996-06-15
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摘要：

以XRD、H2－TPD、TPS方法研究了钝化和硫化处理对Mo2N体相结构和表面性质、以及对吡啶加氢脱氮（HDN）催化活性的影响. Mo2N经钝化或在673K硫化后，虽然其体相结构不发生变化，但其表面性质却发生了明显的异变，并伴随其加氢脱氮活性的显著降低．由Mo2N在不同钝化条件下生成的部分氧化产物以及H2－TPD结果，推测在缓慢钝化条件下，Mo2N表面钝化层为MoO2. 根据Mo2N硫化后的H2－TPD和相应HDN活性变化，以及Mo2N的TPS结果，认为Mo2N经673K硫化后其表面结构发生了硫化异变．

关键词: 钝化, Mo2N, 硫化, HDN

Abstract:

The effects of passivation and sulfidation on the bulk structure and surface properties of Mo2N were studied by using XRD, H2-TPD and TPS methods. The characterization results of Mo2N combined with the pyridin HDN activity show that the surface properties of Mo2N are changed significantly after passivation or sillfidatior in spite of the bulk structure unchanged. The H2-TPD profile for passivated Mo2N is obviously different from that of the fresh one and the pyridin HDN activity 0ver passivated Mo2N is much lower as well. According to the behavior of Mo2N in different passivating conditions and H2-TPD results, we suggest that the passivation 0f Mo2N produces Mo2 on the sample surface. Based on the H2-TPD profiles and the pyridin HDN activity over Mo2N samples which either had been sulfidized or not and the TPS profiles, we conclude that the surface structure of molybdenum nitride has been changed to sulfide under sulfiding condition.

Key words: Passivation, Mo2N, Sulfidation, HDN