| 甲烷氧化偶联催化剂Li/MgO的结构及表面性质的研究 |
| STUDY OF STRUCTURE AND SURFACE PROPERTIES OF Li/MgO CATALYSTS FOR OXIDATIVE COUPLING OF METHANE |
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| 摘要: 本文用XRD、TEM、XPS和荧光光谱等方法研究了一组不同Li+含量的Li/MgO催化剂的结构及表面性质,并与它们的氧化偶联甲烷的催化性能相关联。结果表明,低配位O2-(O3c2-)是使甲烷活化的活性中心。O1s结合能为531.9eV的氧物种是对甲烷氧化偶联反应的C2选择性起作用的活性氧物种。 |
| 关键词: 甲烷氧化偶联 Li/MgO XPS 表面 |
| 基金项目: 国家自然科学基金 |
| Abstract: The structure and suface properties of Li/MgO catalysts with various Li+ content for oxidative coupling of methane have been studied using XRD, XPS, TEM andphotolumincsccnce spcctroscopy in conjunction with traditional catalytic behavior measurement. A good correlation between C2 selectivity and relative intensity of surface oxygen species corresponding to an O1s XPS peak at 531.9eV has been obtained. As an increasing amount of Li+ was added, the ratios O3c2-/ O4c2- increased, passing through a maximum at 10mol% Li+ and then decreasing. The variation of the ratios with Li content paralleled the conversion of CH4, suggesting O3c2- ions are the active sites responsible for methane activation. |
| Keywords: methane oxidative coupling Li/MgO surface XPS |
| 投稿时间：1991-12-31 |
| 摘要点击次数: 1552 |
| 全文下载次数: 1528 |
| 金永漱,颜其洁,黄庆兵,王野,陈懿.甲烷氧化偶联催化剂Li/MgO的结构及表面性质的研究[J].无机化学学报,1992,8(4):433-438. |
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