高等学校化学学报

高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (7): 1343.

• 研究论文 • 上一篇    下一篇

纳米ZrO2在O2/H2气中的表面效应

王新平, 赵沁, 林青松, 蔡天锡   

  1. 大连理工大学化工学院, 精细化工国家重点实验室, 大连 116012
  • 收稿日期:2001-06-27 出版日期:2002-07-24 发布日期:2002-07-24
  • 通讯作者: 王新平(1958年出生),男,博士,副教授,主要从事催化研究.E-mail:wangxp.wuhua@263.net E-mail:wangxp.wuhua@263.net
  • 基金资助:

    国家自然科学基金(批准号:2997704)

Surface Effect of ZrO2 Nanopowder in O2/H2

WANG Xin-Ping, ZHAO Qin, LIN Qing-Song, CAI Tian-Xi   

  1. College of Chemistry and Chemical Engineering, State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
  • Received:2001-06-27 Online:2002-07-24 Published:2002-07-24

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摘要： 用ESR方法研究了一种纳米ZrO2在普通H2气中升温条件下的表面效应.ZrO2上Zr3+的中心量约为1×10-7mol/g.这些Zr3+中心是ZrO2表面一些O2-配位不饱和的Zr原子点位.在普通H2气中,ZrO2上的Zr3+中心数在温度低于400℃时变化很小.但在这一温度范围内从室温升温时,由ZrO2表面羟基的H2还原引起的F中心量随温度的升高而增加.温度高于400℃时,ZrO2表面的Zr3+及F中心可与普通H2气中存在的少量O2气作用产生O2-,并伴随ZrO2表面羟基的脱除而形成新的Zr3+.

关键词: ZrO2, O2/H2, 表面效应, Zr3+中心, F中心

Abstract: Akind of ZrO2 nanopowder annealed at different temperatures in H2 has been studied by ESR. On the surface of ZrO2, about 1×10-7 mol/g of Zr3+ centers are detected, which are the oxygen coordinatively unsaturated Zr. When the annealing temperature is lower than 400℃, the amount of Zr3+ center remains almost unchanged, while the amount of F-center increases in this temperature range, which may be resulted from the reduction of surface hydroxyl by H2. When the annealing temperature is higher than 400℃, O2- is originated on the surface of ZrO2, which may be formed from the reaction of Zr3+ and F-center with the trace amount of O2 in ordinary H2, and simultaneously, some Zr3+ centers are created, as being accompanied with the removal of surface hydroxyl.

Key words: ZrO2, O2/H2, Surface effect, Zr3+ center, F-center

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