| 达建文,杨廷录.甲烷氧化偶联MgO／BaCO3催化剂的表面结构与催化活性[J].分子催化,1995,(5):339-346 |
| 甲烷氧化偶联MgO／BaCO3催化剂的表面结构与催化活性 |
| The Surface Structure and Catalytic Properties of MgO/BaCO_3 Catalyst for Oxidative Coupling of Methane |
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| DOI： |
| 中文关键词: 甲烷 氧化偶联 表面结构 催化活性 氧化镁催化剂 |
| 英文关键词:Methane, Oxidative coupling,MgO, BaCO_3,Catalysts, Surface structure., |
| 基金项目:国家自然科学基金 |
| 达建文 杨廷录 |
| 中国科学院兰州化学物理研究所羰基合成与选择氧化国家重点实验室 |
| 摘要点击次数: 1458 |
| 全文下载次数: 19 |
| 中文摘要: |
| 用ＣＯ２－ＴＰＤ，ＣＯ，ＣＨ４脉冲以及ＥＰＲ，ＸＰＳ等方法对ＭｇＯ／ＢａＣＯ３的表面结构及催化活性进行研究，结果表明，催化剂的碱性，氧扩散速率等对催化剂的活性均有影响。ＢａＣＯ３和ＭｇＯ的共同作用可以增强催化剂的碱性强度?增加强碱中心的量，调变晶格氧的移动性，提高Ｃ２烃的收率和选择性。ＥＰＲ和ＸＰＳ测试结果表明，表面吸附态的氧物种Ｏ＾－２作为甲烷氧化偶联活性氧物种的前驱态在反应反应条件下可转化为活 |
| 英文摘要: |
| The catalytic performance and surface properties of the MgO/ BaCO3 catalyst were studied using catalytic activity testing and pulse reaction techniques, EPR and XPS methods.It was demonstrated that both the lattice oxygen mobility and Surface basicity affected the performance of the catalyst. The cooperation of BaCO3 with MgO resulted in the strong surface basicity and proper lattice oxygen mobility on the catalyst to favor the title reaction. EPR and XPS characterization indicated that the O2-ions as the precuresor of active species could be converted to O2(2-) ions, which are responsible for the methane activation. The activity of MgO, the active components of which could be adjusted by the cooperation of BaCO3, an inert component, to favor the title reaction, elevate both CH4 conversion and C2 selectivity. |
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