【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Ｃｏ￣（２＋）离子和Ｏ＿２的结合是可逆的，吸附产生Ｃｏ￣（３＋）－自由基加合物有超精细结构的ＥＳＲ谱；当温度增加，吸附态自由基发生转移并稳定在Ｍｇ￣（２＋）离子上形成Ｍｇ￣（２＋）－Ｏ自由基，文中着重讨论Ｃｏ￣（３＋）－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。更多还原

【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 ob－served that Co²⁺ ions on the surface of CoO-MgO could combine with oxygen reversibly at low temperature of 77－150K and generate a co balt－oxygen radical adduct Co³⁺－O which is responsible for the appearanee of hyperfine stnlctural lines in ESR spectrum. On increasing the temperature O radical in co balt－oxygen adduct would be transferred and stabillzed on Mg²⁺ ions，and fomied a new Mg²⁺-O 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 elec－tron delocalization had been suggested to account for the origin of the hyperfine lines in ESR spectra.更多还原