中国科学技术大学学报 ›› 2010, Vol. 40 ›› Issue (4): 358-362.DOI: 10.3969/j.issn.0253-2778.2010.04.005

• 原创论文 • 上一篇    下一篇

Sr2Fe1-xMgxMoO6复合氧化物的 甲烷催化燃烧性能研究

汪正红   

  1. 1.中国科学院能量转换材料重点实验室,中国科学技术大学材料科学与工程系,安徽合肥 230026; 2.安徽建筑工业学院材料与化学工程学院,安徽合肥 230022
  • 收稿日期:2009-02-17 修回日期:2009-05-08 出版日期:2010-04-30 发布日期:2010-04-30
  • 通讯作者: 杨萍华
  • 作者简介:汪正红,男,1981年生,硕士. 研究方向:无机功能材料. E-mail:wzh2006@mail.ustc.edu.cn
  • 基金资助:
    国家自然科学基金(50442024)和可控化学与材料化工安徽省重点实验室资助.

Catalytic combustion of methane over double perovskite Sr2Fe1-xMgxMoO6 mixed oxides

WANG Zhenghong   

  1. 1.CAS Key Laboratory of Materials for Energy Conversion, and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China; 2.School of Materials & Chemical Engineering, Anhui University of Architecture, Hefei 230022, China
  • Received:2009-02-17 Revised:2009-05-08 Online:2010-04-30 Published:2010-04-30

摘要: 采用溶胶凝胶法制备了双钙钛矿结构Sr2Fe1-xMgxMoO6系列氧化物,通过XRD、BET、XPS、TG等手段对催化材料进行了物性表征;以甲烷纯氧燃烧为目标反应,研究了Mg离子对Fe离子进行掺杂替代对催化材料性能的影响.结果表明:Sr2Fe1-xMgxMoO6主要有两个阶段的失重过程,分别与吸附态氧和晶格氧的失去有关;Mg2+掺杂导致B位有序度的提高,对催化活性不利.

关键词: 甲烷, 催化燃烧, 双钙钛矿, 氧空位

Abstract: A series of double perovskite mixed oxide catalysts nominal Sr2Fe1-xMgxMoO6 was prepared with the sol-gel method and the properties of as-synthesized powders were characterized by XRD, BET, XPS, and TG. The catalytic activity of the Sr2Fe1-xMgxMoO6 for catalytic combustion of methane was tested in a pure oxygen atmosphere without dilute gas. The TG curves exhibit a typical two weight-loss processes similar to that of perovskite oxides. The results reveal that the catalytic activity of Sr2Fe1-xMgxMoO6 is affected by Fe/Mg ratio distinctly. It is suggested that substitution Fe ion with Mg results in the order of structure and the decrease of oxygen vacancy concentration on the surface, which is disadvantageous to the catalysis activity of methane combustion.

Key words: methane, catalytic combustion, double perovskite, oxygen vacancy