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Oxidative Dehydrogenation of Ethane over Sn-W-O_x Catalysts

机译：SN-W-O_x催化剂对乙烷的氧化脱氢

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The oxidative dehydrogenation of ethane to ethene was investigated over the catalyst composed of tin and tungsten oxides at 923 K under atmospheric pressure. A pure SnO2 catalyst showed the high ethane conversion but low ethene selectivity (the major product was carbon dioxide). On the other hand, a pure WO3 catalyst showed the high ethene selectivity while the ethane conversion was relatively low. The remarkable synergetic effect of tin and tungsten was observed when Sn2W3O8 was used as catalyst precursor. According to the XRD measurement, Sn2W3O8 was found to decompose into SnO2 and WO3 after the reaction, however, no significant difference was observed in the XPS analysis for tin and tungsten between the samples before and after the reaction. To clarify the synergism of tin and tungsten in Sn2W3O8, the Auger parameter was employed for the surface oxygen atom of the catalyst. The clear relationship was found between the ethene yield and the ionicity of the oxygen atom.
机译：在大气压下，在923K下在923k处的催化剂上研究了乙烷对乙烯的氧化脱氢。 纯SnO2催化剂显示出高乙烷转化但低乙烯选择性（主要产物是二氧化碳）。 另一方面，纯WO3催化剂显示出高乙烯选择性，而乙烷转化率相对较低。 当SN2W3O8用作催化剂前体时，观察到锡和钨的显着协同作用。 根据XRD测量，发现SN2W3O8在反应后发现SNO 2和WO3分解为SNO2和WO3，但在反应前后样品之间的锡和钨中没有观察到显着差异。 为了阐明SN2W3O8中锡和钨的协同作用，使用螺旋钻参数用于催化剂的表面氧原子。 在乙烯产率和氧原子的离子性之间发现了明显的关系。

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