高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (9): 1699.

• 研究论文 • 上一篇    下一篇

Ce0.67Zr0.33O2对CH4燃烧催化剂Fe2O3/Al2O3的改性作用

陈清泉, 张丽娟, 陈耀强, 王敏, 龚茂初   

  1. 四川大学化学学院, 成都610064
  • 收稿日期:2004-09-17 出版日期:2005-09-10 发布日期:2005-09-10
  • 基金资助:

    国家重点基础研究发展规划项目(批准号:G1999022407)资助.

Effect of Ce0.67Zr0.33O2 on Catalytic Properties of Fe2O3/Al2O3 Catalyst for Methane Combustion

CHEN Qing-Quan, ZHANG Li-Juan, CHEN Yao-Qiang, WANG Min, GONG Mao-Chu   

  1. College of Chemistry, Sichuan University, Chengdu 610064, China
  • Received:2004-09-17 Online:2005-09-10 Published:2005-09-10

摘要: 固定n(Ce)/n(Zr)比为0.67/0.33,用共沉淀法制得一系列CeO2-ZrO2-Al2O3固溶体.采用这些固溶体作载体,以Fe2O3为活性组分,用浸渍法制备了一系列催化剂.BET结果显示,将适量Ce0.67Zr0.33O2引入到Al2O3载体中有助于催化剂保持较高的比表面积.TPR结果显示,载体中引入适量的Ce0.67Zr0.33O2可以改善催化剂的氧化还原性能.XRD结果表明,Fe2O3在CeO2-ZrO2-Al2O3载体上呈现出良好的分散状况,老化前后催化剂的晶相结构基本无明显变化.特别是当载体中m(Ce0.67Zr0.33O2)∶m(Al2O3)的值为1∶2时,Fe2O3/CeO2-ZrO2-Al2O3催化剂在甲烷催化燃烧中显示出最佳的催化性能和抗高温老化性能.

关键词: CeO2-ZrO2-Al2O3, Fe2O3系整体式催化剂, 甲烷催化燃烧, 催化性能, 抗高温老化

Abstract: In order to find a kind of low-cost and high-capability catalyst for methane combustion, a series of CeO2-ZrO2-Al2O3 solid solution, in which the content of Ce0.67Zr0.33O2 and Al2O3 were different, were prepared by co-precipitation method. Fe2O3-based catalysts supported on the solids were prepared by impregnation. Their characterizations and catalytic activity were tested by BET, TPR, XRD methods after being calcined at 600 ℃ or aging in water gas at 1 000 ℃. It is indicated that addition of Stoichiometric Ce0.67Zr0.33O2 into the Al2O3 support improved the catalytic capability of the Fe2O3/CeO2-ZrO2-Al2O3 catalyst, increased the catalyst's specific surface areas, promoted its redox ability, and stabilized its crystal structure. In particular, when m(Ce0.67Zr0.33O2)∶m(Al2O3) was 1∶2, the Fe2O3/CeO2-ZrO2-Al2O3 catalyst possessed the best catalytic capability and the best resistance to aging at high temperature.

Key words: CeO2-ZrO2-Al2O3, Fe2O3-based monolith catalyst, Catalytic combustion of methane, Catalytic properties, Resistance to aging at high temperature

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