高等学校化学学报

高等学校化学学报 ›› 1998, Vol. 19 ›› Issue (7): 1112.

• 论文 • 上一篇    下一篇

铜离子交换分子筛上NO吸附的IR光谱及TPD研究

张文祥1, 贾明君1, 张春雷1, 张丽华1, 吴通好1, 孙铁2, 八寻秀典3, 岩本正和4   

  1. 1. 吉林大学化学系, 长春, 130023;
    2. 哈尔滨市环境监测站, 哈尔滨, 150076;
    3. 广岛大学工学部, 东广岛, 739, 日本;
    4. 北海道大学触媒研究中心, 札幌, 060, 日本
  • 收稿日期:1997-06-27 出版日期:1998-07-24 发布日期:1998-07-24
  • 通讯作者: 张文祥,男,35岁,博士,副教授.
  • 作者简介:张文祥,男,35岁,博士,副教授.
  • 基金资助:

    国家自然科学基金(批准号:29503017)资助课题.

FTIR and TPD Studies of Adsorption Properties of Nitrogen Monooxide over Copper Ion exchanged Zeolites

ZHANG Wen-Xiang1, JIA Ming-Jun1, ZHANG Chun-Lei1, ZHANG Li-Hua1, WU Tong-Hao1, SUN Tie2, YAHIRO Hidenori3, IWAMOTOM asakazu4   

  1. 1. Department of Chemistry, Jilin University, Changchun, 130023;
    2. Haerbin Envir, Monitor, Haerbin, 150076
  • Received:1997-06-27 Online:1998-07-24 Published:1998-07-24

PDF (PC)

被引次数

18

摘要： 采用原位IR光谱及TPD技术研究了NO在铜离子交换分子筛上各种表面物种的生成及脱附,并与NO在Cu-ZSM-5上的分解反应性能相关联,考察了Cu-ZSM-5反应活性高的原因及O2的生成机理。NO的吸附状态随分子筛母体种类及铜离子交换度的不同而变化,交换度较高的ZSM-5催化剂上容易形成NO-3物种,该物种对NO分解及O2的生成具有重要作用。

关键词: 铜离子交换分子筛, 一氧化氮吸附, 傅利叶变换红外光谱, 程序升温脱附

Abstract: The relations of the adsorption properties and the behavior of catalytic decomposition of nitrogen monooxide over various copper ion-exchanged zeolites were studied by the means of in situ FTIR and temperature-programmed desorption (TPD). The results demonstrated that NO+, O--Cu-NO and NO3- species were formed on the surface of the zeolites and desorbed at 350～400 K(denoted as α), 400～480 K(β) and 650～700 K(γ), respectively. It was found that the kinds and the amounts of the species were greatly changed with the zeolite structure and the copper ion exchange level, i. e . Cu-MFI, Cu-MOR and Cu-OFF/ERIgave α, β and γ peaks; Cu-FER gave α and β peaks; Cu -LTLand Cu-FAU only gave α peak. The amounts of desorption were increased linearly with the exchange level of copper on Cu-MFI. The O2desorption peak appeared at the same temperature as that of the γ peak. In addition, by comparing the present results with the behavior of catalytic decomposition of NO, it is also found that NO3- species play a key role in the catalytic decomposition of NOand the formation of O2over the zeolites.

Key words: Copper ion-exchanged zeolites, Nitrogen monooxide adsorption, Fourier transform infrared spectroscopy, Temperature-programmed desorption

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