波谱学杂志 ›› 1995, Vol. 12 ›› Issue (6): 613-620.

• 研究论文 • 上一篇    下一篇

多相氧载体CoO-MgO和氧分子作用的ESR研究

詹瑞云   

  1. 中国科学院长春应化所应用谱学开放实验室, 长春 130022
  • 收稿日期:1994-09-13 修回日期:1994-10-29 出版日期:1995-12-05 发布日期:2018-01-17

ESR STUDY OF THE ADSORPTION OF O2 MOLECULES ON THE SURFACE OF CoO-MgO AS A HEIEROGENEOUS OXYGEN CARRIER

Zhan Ruiyun   

  1. Changchun Institute of Applied Chemistry, The Chinese Academy of Sciences, Changchun 130022
  • Received:1994-09-13 Revised:1994-10-29 Online:1995-12-05 Published:2018-01-17

摘要: 用ESK研究多相氧载体CoO-MgO表面上氧的吸附作用,发现在77-150K温度范围内表面Co2+离子和O2的结合是可逆的,吸附产生Co3+-O2-自由基加合物有超精细结构的ESR谱;当温度增加,吸附态O2-自由基发生转移并稳定在Mg2+离子上形成Mg2+-O2-自由基,文中着重讨论Co3+-O2-自由基的电子结构和成键本质,认为自由基是通过自旋成对的方式形成的,由于σ-л键作用引起的自旋极化以及由于电子离域作用而引起的偶极作用与ESR制的超精细结构线产生有关。

关键词: 多相氧载体, CoO-MgO, 吸附作用, 超氧负离子自由基, ESR

Abstract: The adsorption of oxygen molecules on the CoO-MgO as a kind of heterogeneous oxygen carrier has been studicd from 77 to 300K by ESR,It was observed that Co2+ ions on the surface of CoO-MgO could combine with oxygen reversibly at low temperature of 77-150K and generate a cobalt-oxygen radical adduct Co3+-O2- which is responsible for the appearanee of hyperfine stnlctural lines in ESR spectrum.On increasing the temperature O2- radical in cobalt-oxygen adduct would be transferred and stabillzed on Mg2+ ions,and fomied a new Mg2+-O2- radical adduct at room temperature,In this paper the electronic structure of the cobalt-oxygen adduct and their bonding nature were discussed by the analysis of ESR spectra.Both the spin polarintion due to σ-л bond interaction and the electron delocalization had been suggested to account for the origin of the hyperfine lines in ESR spectra.

Key words: Heterogeneous Oxygen carrier, CoO-MgO, Adsorption, Superoxygen anion radi-cal, ESR