Li~＋／MgO上乙烷氧化脱氢制乙烯的研究（Ⅱ）──催化作用机理

Studies on Oxydehydrogenation of Ethane to Ethene on Li+/MgO Catalysts(Ⅲ)─The Mechanism of Catalytic Action

借助ＸＲＤ、ＩＲ、ＴＧ等技术对Ｌｉ＋／ＭｇＯ进行了表征。结果表明，酸、碱中心的数目、强度、催化活性与Ｌｉ＋的添加量相关，起酸碱作用的表面金属离子、表面低配位氧集团、Ｏ－（Ｌｉ＋Ｏ－）是其反应的活性物种，反应机理可能由离子基、游离基协同完成。

The:oxydehydrogenation of ethane to ethene has been studied over Li+ doped with MgO catalysts with various Li+ contents. In this paper,we investigated the catalytic mechanism of oxydehydrogenation on Li+/MgO with XRD,IR,TG.It is found that the quantity of Li+ doped with MgO affect amounts and intensity of acid and basic centres, surface metal ions and oxygen groups with low coordination are active species for the reaction.The oxydehydrogenation of ethane to ethane on Li+/MgO is probable by the simultaneous action of radical and ionic mechanism.