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化学学报
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化学学报 ›› 2003, Vol. 61 ›› Issue (2): 218-224. 上一篇    下一篇

研究论文

用FTIR方法表征一氧化氮在Co／ZSM-5和[Co+Mg(Sr)]／ZSM-5上的吸附

朱崇业;李哲伟;郑崇碧   

  1. 复旦大学复旦学报（自然科学版）;韩国化学研究院固体化学研究室
  • 发布日期:2003-02-15

FTIR Study of NO Adsorption over Co/ZSM-5 and [Co + Mg(Sr) ]/ZSM-5

Zhu Chongye;Lee C.W;Chong P.J   

  1. Journal of Fudan University(Natural Science),Fudan University;Solid-state Chemistry Laboratory,Korea Research Institute of Chemical Technology
  • Published:2003-02-15

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用傅里叶红外光谱（FTIR）方法表征了一氧化氮在Co/ZSM-5上的吸附，在 Co/ZSM-5上主要的吸附物种为Co^2+-(NO)2，它们的红外吸附峰位在1813和 1896cm^-1,Co^2+-NO吸附峰在1939-1941cm^-1区域。并且由这些吸附锋的强度得 NO的吸附量经验关系式：CNO=INO/（εNO·m/3.14）。由此式计算出NO在Co/ZSM- 5和[Co+Mg(Sr)]/ZSM-5上的吸附NO的吸附浓度，另用FTIR方法表征了Co/ZSM-5和 [Co+Mg(Sr)]／ZSM-5的差劲基峰。这些表征为氮氧化物选择性催化还原（SCR）反 应催化剂的研制提供了有用的信息。

关键词: 傅里叶变换, 红外分光光度法, 氧化氮, 钴, ZSM-5, 吸附, 还原, 分子筛, 催化剂

The adsorption of NO on Co/ZSM-5 zeolites with different Co content is studied by FTIR spectroscopy. The dominant NO species absorbed on Co/ZSM-5 is found to be in a dinitrosyl form, as demonstrated by the IR bands at 1813 and 1896 cm" . The mononitrosyl form occurs in the region of 1939-1941 cm" as a minor species. Based on the integrated intensities of IR bands at 1813 and 1896 cm"1, an experimental equation, i.e., C-NO = I-NO/ (ε-NO· m/3.14), has been proposed for estimating the amount of adsorbed NO molecules ( CNO), from which the values of C-NO on both Co/ZSM-5 and [Co+ Mg(Sr)]/ZSM-5 have been calculated. In addition, the OH stretching region on Co/ZSM-5 and [Co+ Mg(Sr)]/ZSM-5 is studied by FTIR. These studies may provide useful information for SCR catalysts of NO

Key words: FT, IR, NITROGEN OXIDE, COBALT, ZSM-5, ADSORPTION, REDUCTION, MOLECULAR SIEVE, CATALYST

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