高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (3): 432.

• 论文 • 上一篇    下一篇

甲烷氧化偶联La-Me-O(Me=Mg,Ca,Sr,Ba)系催化剂表面氧种的研究

吴波1, 远松月1, 于作龙2   

  1. 1. 中国科学院长春应用化学研究所, 长春 130022;
    2. 中国科学院成都有机化学研究所
  • 收稿日期:1994-04-08 修回日期:1994-08-17 出版日期:1995-03-24 发布日期:1995-03-24
  • 通讯作者: 远松月
  • 作者简介:吴波,女,25岁,硕士研究生.
  • 基金资助:

    国家自然科学基金

A Study of Surface Oxygen Species from La-Me-O (Me=Mg, Ca,Sr, Ba) Catalysts for Methane Oxidative Coupling

WU Bo1, YUAN Song-Yue1, YU Zuo-Long2   

  1. 1. Changchun Institute of Applied Chemistry, Academia Sinica, Changchun 130022;
    2. Chengdu Institute of Organic Chemistry, Academia Sinica, Chengdu
  • Received:1994-04-08 Revised:1994-08-17 Online:1995-03-24 Published:1995-03-24

摘要: 利用CO2-TPD法考察了La-Me-O(Me=Mg,Ca,Sr,Ba)系催化剂的表面碱性,并用O2-TPD、CH4-TPD法对该体系的表面活性氧种进行了表征,并与催化性能相关联。结果表明,La-Ba-O催化剂由于表面强碱性中心数目多,产生活性氧种的数目也多,有利于甲烷的活化,因而具有最高的甲烷转化率和C2烃选择性。脉冲反应表明,在无气相氧存在下,表面晶格氧参与了氧化偶联,而且是选择氧化的活性氧种。

关键词: 甲烷, 氧化偶联, La-Me-O系催化剂, 表面氧种

Abstract: CO2-TPD was used to study the surface basicity of La-Me-Omixed oxides and O2TPD, CH4-TPD were employed to study the surface active oxygen species. Comparing the CO2-TPD with O2-TPD, we can see that the basicity of catalyst is in parallel with the catalystic activity. The stronger basicity is more profitable for the catalyst to adsorb oxygen to form active oxygen species and to activate CH4by breaking a C-Hbond. By comparing the catalytic activity. the results showed that La-Ba-O(La/Ba=7/3) catalyst had the strongest basicity, and it gave the highest CH4conversion and C2selectivity. The results from the pulse reaction showed that the lattice oxygen participated in the OCM reaction without gas oxygen, and it was the selective oxygen species.

Key words: Methane, Oxidation coupling, La-Me-O catalyst, Surface oxygen species

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