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用XRD,Mossbauer,XPS和TPD研究了Sb-Fe催化剂的活性组分和它们的催化行为以及TPD的产物分布。XRD测定表明,活性组分可能有FeSbO_4和Sb_2O_4。穆斯堡尔谱结果确定活性组分除有FeSbO_4外,还有FeSb_2O_6。由富锑催化剂的XPS分析,出现结合能为709.3eV的肩峰,进一步证明含Fe_(2+)新活性组分FeSb_2O_6的存在。由Fe_(3+)和Fe_(2+)含量与活性的关系可以得出结论,催化作用取决于FeSbO_4,FeSb_2O_6和Sb_2O_4的协同作用,FeSb_2O_6是表面活性中心。最后,由催化剂的活性组分和催化作用以及TPD产物分布初步探讨了催化作用机理。
The active components of Sb-Fe catalysts and their catalytic behavior and product distribution of TPD were investigated by XRD, Mossbauer, XPS and TPD. XRD analysis shows that the active components may have FeSbO 4 and Sb 2 O 4. Mossbauer spectroscopy results confirmed that the active ingredient in addition to FeSbO_4, but also FeSb_2O_6. XPS analysis of Sb-rich catalysts revealed a shoulder peak with a binding energy of 709.3 eV, further confirming the existence of FeSb_2O_6, a new Fe_ (2+) active component. According to the relationship between Fe 3+ and Fe 2+ content and activity, it can be concluded that the catalysis depends on the synergetic effect of FeSbO 4, FeSb 2 O 6 and Sb 2 O 4, and FeSb 2 O 6 is the surface active center. Finally, the mechanism of catalysis was preliminarily discussed from the active components and the catalytic activities of the catalysts and the distribution of TPD products.