| Li／La2O3的表面活性氧及其在甲烷氧化偶联中的催化行为 |
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| 引用本文： | 王吉祥,刘艳滨.Li／La2O3的表面活性氧及其在甲烷氧化偶联中的催化行为[J].应用化学,1991,8(3):60-62. |
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| 作者姓名： | 王吉祥 刘艳滨 |
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| 作者单位： | 中国科学院长春应用化学研究所，中国科学院长春应用化学研究所，中国科学院长春应用化学研究所，中国科学院长春应用化学研究所 长春 130022，长春 130022，长春 130022，长春 130022 |
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| 摘 要： | 甲烷氧化偶联反应近年来研究十分活跃。Lunsford等报道了载有碱金属的碱土氧化物是对此反应有效的催化剂,并提出晶格取代型活性中心M~ O~-〕和表面活化、气相偶联的反应机理。Otsuka等系统地研究了稀土氧化物的甲烷氧化偶联活性,本文通过氧化镧中添加锂前后的对比,运用骤冷技术与ESR法研究了催化剂的表面活性氧,以低温TPD法研究了甲烷在催化剂表面上的吸附与活化,以及在甲烷氧化偶联中的催化行为。
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| 关 键 词： | 甲烷 氧化偶联 氧化镧 锂 表面活性氧 |
| 收稿时间： | 1990-02-16 |
THE ACTIVE OXYGEN ON Li/La_2 O_3 SURFACE AND ITS CATALYTIC BEHAVIOR IN OXIDATIVE COUPLING OF METHANE |
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| Wang Jixiang,Liu Yanbin,Wang Lianchi,Wu Yue Changchun Institute of Applied Chemistry,Academia,Sinica,Changchun.THE ACTIVE OXYGEN ON Li/La_2 O_3 SURFACE AND ITS CATALYTIC BEHAVIOR IN OXIDATIVE COUPLING OF METHANE[J].Chinese Journal of Applied Chemistry,1991,8(3):60-62. |
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| Authors: | Wang Jixiang Liu Yanbin Wang Lianchi Wu Yue Changchun Institute of Applied Chemistry Academia Sinica Changchun |
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| Institution: | Wang Jixiang,Liu Yanbin,Wang Lianchi,Wu Yue Changchun Institute of Applied Chemistry,Academia,Sinica,Changchun 130022 |
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| Abstract: | The selectivity of oxidative coupling of methane was greatly enhanced by adding Li toLa_2O_3. By using quenching and ESR technique, O_2 species were found on Li/La_2O_3, butnot on the single La_2O_3. TPD measurements from 77K to room temperature were performedon methane preadsorbed on Li/La_2O_3 and single La_2O_3. Ethane desorbed during theTPD of Li/La_2O_3, but could not be detected in that of single La_2O_3. It is considered thatthe addition of Li to La_2O_3 gives rise to some basic sites, which are favorable to the coup-ling reaction, and this addition decreases the surface area, resulting in repression of thefurther oxidation of CH_3. radicals. |
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| Keywords: | methane oxidative coupling lanthanum oxide lithium active oxygen |
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