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化学学报
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化学学报 ›› 2011, Vol. 69 ›› Issue (18): 2080-2084. 上一篇    下一篇

研究论文

Ir/ZrO2催化剂对甲烷催化燃烧性能的研究

胡盼静，孟涟，马瑞红，金凌云，鲁继青，罗孟飞*   

  1. (浙江师范大学物理化学研究所 浙江省固体表面反应化学重点实验室 金华 321004)
  • 投稿日期:2011-01-12 修回日期:2011-02-25 发布日期:2011-05-17
  • 通讯作者: 罗孟飞 E-mail:mengfeiluo@zjnu.cn
  • 基金资助:

    浙江省科技计划项目

Catalytic Combustion of Methane over Ir/ZrO2 Catalysts

HU Pan-Jing, MENG Lian, MA Rui-Hong, JIN Ling-Yun, LU Ji-Qing, LUO Meng-Fei   

  1. (Zhejiang Key Laboratory for Reactive Chemistry on Solid Surfaces, Institute of Physical Chemistry, Zhejiang Normal University, Jinhua 321004)
  • Received:2011-01-12 Revised:2011-02-25 Published:2011-05-17

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采用浸渍法制备了ZrO2为载体负载Ir的催化剂(Ir/ZrO2), 考察了催化剂的CH4催化燃烧性能. 采用X射线衍射(XRD), 拉曼光谱(Raman), X射线光电子能谱(XPS), 氢气程序升温还原(H2-TPR)等技术对催化剂的结构和Ir物种的存在形式进行了表征. 结果表明, Ir/ZrO2催化剂中Ir是以IrO2形式存在的, Ir/ZrO2催化剂的CH4燃烧表观活性随着Ir负载量的增加而提高, 并且催化剂表现出较高的催化活性和良好的反应稳定性. 在低Ir负载量(≤1%)时, CH4燃烧的转换频率(TOF)随着Ir粒子的增大而提高|然而高Ir负载量(≥1%)时, TOF随着Ir粒子的增大保持不变.

关键词: Ir/ZrO2催化剂, 甲烷, 催化燃烧

Ir catalysts supported on ZrO2 were prepared by an impregnation method, and their catalytic performance for CH4 catalytic combustion were tested. The catalyst structure and Ir species in the catalyst were characterized by X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and H2 temperature programmed reaction (H2-TPR) techniques. The results showed that Ir existed in the form of IrO2 in the Ir/ZrO2 catalysts. The apparent activity of Ir/ZrO2 catalysts for CH4 combustion increased with Ir loading, and the catalysts showed high activities as well as good stability. Turnover frequency (TOF) for CH4 combustion increased with Ir particle size with low Ir loading (≤1%), however, it remained constant with high Ir loading (≥1%).

Key words: Ir/ZrO2 catalyst, methane, catalytic combustion