高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (4): 575.

• 论文 • 上一篇    下一篇

Ba-La-O-(F)催化剂的碱性及其OCM反应性能

翁维正, 陈明树, 万惠霖, 方智敏   

  1. 固体表面物理化学国家重点实验室, 厦门大学化学系, 物理化学研究所, 厦门 361005
  • 收稿日期:1998-12-14 出版日期:2000-04-24 发布日期:2000-04-24
  • 通讯作者: 万惠霖(1938年出生),男,硕士,教授,博士生导师,中国科学院院士,主要从事多相催化及酶催化研究.E-mail:hlwan@xmu.edu.cn E-mail:hlwan@xmu.edu.cn
  • 基金资助:

    国家重点基础研究发展规划项目(批准号:G1999022408);福建省自然科学基金(批准号:B97001)

Basicity of Ba-La -O-(F) Catalysts and Their Catalytic Performances for the OCM Reaction

WENG Wei-Zheng, CHEN Ming-Shu, WAN Hui-Lin, FANG Zhi-Min   

  1. State Key Laboratory of Physical Chemistry for Solid Surfaces, Department of Chemistry, Institute of Physical Chemistry, Xiamen University, Xiamen 361005, China
  • Received:1998-12-14 Online:2000-04-24 Published:2000-04-24

摘要: 采用XRD,TPD和高温原位IR光谱对La2O3,BaO/La2O3,BaF2/La2O3,LaOF和BaF2/LaOF等催化剂的组成、结构和CO2在催化剂上的吸附状况进行了表征,并结合催化剂性能评价结果对该系列催化剂的碱性及其与OCM反应性能的关系进行了考察.结果表明,催化剂OCM反应性能与其酸碱性的强弱无简单的对应关系.

关键词: 镧基催化剂, 甲烷氧化偶联, 碱性, 二氧化碳吸附, 原位红外光谱, 程序升温脱附

Abstract: The structure and surface basicity of a series of lanthanum based catalysts (La2O3, BaO/La2O3, BaF2/La2O3, LaOF, BaF2/LaOF) were characterized by XRD, CO2-TPDand high temperature in situ FTIRspectroscopy of CO2 adsorption. Both the results of CO2 TPDand in situ FTIRspectra of CO2 adsorption indicate that the basicity of the catalysts decreases in the sequence BaO/La2O3>La2O3>BaF2/La2O3>BaF2/LaOF>LaOF. The experiments of catalytic performance evaluation of the catalysts performed at 800 ℃ under the conditions of V (CH4)/ V (O2)=4 and GHSV= 15000 h-1 indicate that the BaF2 modified La2O3 and LaOFdemonstrate a better OCMperformance compared to the corresponding La2O3 and LaOF. These observations suggest that the surface basicity is not always a requisite attribution for a good OCMcatalyst.

Key words: Lanthanum based catalysts, Oxidative coupling of methane, Basicity, CO2 adsorption, in situ IR, TPD

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