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在本工作的研究报导Ⅰ和Ⅱ(见本期477页和481页)中,已对Mn_2O_3-Na_2WO_4/SiO_2催化剂活性相的表面分散状态、表面氧种和表面结构进行了详细表征。但甲烷氧化偶联反应在高温(700—800℃)下进行。本文进一步对该催化剂在此反应高温下的XRD和XPS研究表明,其表面状态较室温下有显著变化,结合前文的室温下表征结果,使我们对高温反应条件下该催化剂组分间协同作用、表面活性氧种和活性位结构性质有了进一步的理解,并有可能对其甲烷催化活化机理进行较为深入的探讨。
In this work, Research Reports I and II (pages 477 and 481 of this issue), the surface-dispersed state, surface oxygen species and surface structure of the Mn_2O_3-Na_2WO_4 / SiO_2 catalyst active phase have been characterized in detail. However, the methane oxidation coupling reaction is carried out at a high temperature (700-800 ° C). In this paper, XRD and XPS studies of the catalyst at high temperature show that the surface state of the catalyst has a significant change compared with room temperature. Combined with the above characterization results at room temperature, we make the synergistic effect between the catalyst components under high temperature reaction conditions, Surface active oxygen species and active site structure have been further understood, and it is possible to discuss the mechanism of methane catalytic activation in more depth.