高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (6): 929.

• 论文 • 上一篇    下一篇

Li+/MgO上乙烷氧化脱氢制乙烯的研究(Ⅱ)──催化作用机理

蔡炳新1, 郑小明2   

  1. 1. 湖南大学化学化工系, 长沙, 410082;
    2. 杭州大学化学系
  • 收稿日期:1994-10-07 修回日期:1995-02-28 出版日期:1995-06-24 发布日期:1995-06-24
  • 通讯作者: 蔡炳新,男,38岁,副教授.
  • 作者简介:蔡炳新,男,38岁,副教授.
  • 基金资助:

    国家自然科学基金

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

CAI Bing-Xin1, ZHENG Xiao-Ming2   

  1. 1. Department of Chemistry and Chemical Engineering, Hunan University, Changsha, 410082;
    2. Department of Chemistry, Hangzhou University, Hangzhou
  • Received:1994-10-07 Revised:1995-02-28 Online:1995-06-24 Published:1995-06-24

摘要: 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.

关键词: 氧化脱氢, 活性中心, 脱氢机理

Abstract: 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.

Key words: Oxydehydrogenation, Active centre, Dehydrogenation mechanism

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