高等学校化学学报 ›› 1994, Vol. 15 ›› Issue (2): 261.

• 论文 • 上一篇    下一篇

Bi-Mo-Nb复合氧化物催化作用机理的ESR和XPS研究

陈铜1, 远松月1, 张瑞峰1, 詹瑞云1, 于作龙2   

  1. 1. 中国科学院长春应用化学研究所, 长春;
    2. 中国科学院成都有机化学研究所, 成都, 610041
  • 收稿日期:1993-04-07 修回日期:1993-10-10 出版日期:1994-02-24 发布日期:1994-02-24
  • 通讯作者: 于作龙
  • 作者简介:陈铜,男,30岁,硕士,讲师,现在承德石油高等专科学校.
  • 基金资助:

    国家自然科学基金

A Study of Redox Mechanism of Bi-Mo-Nb Complex Oxide Catalysts by ESR and XPS

CHEN Tong1, YUAN Song-Yue1, ZHANG Rui-Feng1, ZHAN Rui-Yun1, YU Zuo-Long2   

  1. 1. Changchun Institute of Appied Chemistry, Academia Sinica, Changchun;
    2. Chengdu Institute of Organic Chemistry, Academia Sinica, Chengdu, 610041
  • Received:1993-04-07 Revised:1993-10-10 Online:1994-02-24 Published:1994-02-24

摘要: 用ESR对比研究了掺杂Nb对α-Bi2MO3O(12)催化剂丙烯还原和氧再氧化的影响,并用XPS原位Ar+溅射研究了催化剂的还原与再氧化过程,观察了上述过程中催化剂内金属离子的价态变化和晶格氧的扩散现象。提出了Bi-Mo间通过晶格氧扩散所发生的氧化还原作用及模型,探讨了Nb5+取代Mo6+产生的氧空位对加速晶格氧扩散所起的作用。

关键词: 钼-铋氧化物催化剂, 氧化还原机理, 固体缺陷, 氧空位, 电子自旋共振, 光电子能谱

Abstract: α-Bi2MO3O12 and Nb-doped α-Bi2MO3O12 catalysts were studied by means of in situ ESR and XPS with Ar-ion sputtering.It was observed that the lattice oxygen diffusion and electron transition between Bi and Mo species in the catalyst during the redox cycle.Amodel for the redox mechanism in the catalyst was proposed.The substitution of small amount of Nb5+ for Mo6+ significantly enhances the redox rate due to forming oxygen vacancies caused by doping Nb5+ in α-Bi2MO3O12,which accelerates the transfer speeds of oxygen and electron in catalysts.

Key words: Bi-Mo oxide catalyst, Redox mechanism, Solid defect, Oxygen vacacy, ESR, XPS

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