电子自旋共振(Electron Spin Resonance以下简称ESR)法可应用于研究含有不成对电子的体系,例如,有机、无机、高分子化合物以及生命物质中的各种自由基,过渡金属离子,晶体中的缺陷以及半导体中的杂质等等。近十年来,这种技术广泛地应用于催化剂性质的研究,它提供了催化剂的表面现象和微观结构,过渡金属离子的价态,吸附质和吸附剂之间电子转移以及催化活性中心的本质等许多方面的知识。因此,它已成为研究催化剂物理化学性质的重要工具之一。在催化剂的研究中,这种方法的有效性在于,在许多情况下,催化剂表现出顺磁性质,同时在催化反应过 The Electron Spin Resonance (ESR) method can be applied to the study of systems containing unpaired electrons, for example, various free radicals in organic, inorganic, polymeric compounds and living substances, transition metal ions, Defects and impurities in the semiconductor and so on. In the past ten years, this technique has been widely applied to the study of the properties of catalysts. It provides the surface phenomena and microstructures of catalysts, valence states of transition metal ions, electron transfer between adsorbates and adsorbents, and the nature of catalytic activity centers Many aspects of knowledge. Therefore, it has become one of the important tools for studying the physico-chemical properties of catalysts. In the study of catalysts, the effectiveness of this method is that, in many cases, the catalyst exhibits paramagnetic properties and, at the same time,