高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (3): 428.

• 论文 • 上一篇    下一篇

经过吸附处理的Ti-Si沸石的IR和UV-Vis光谱研究

夏清华, 高滋, 陈国辉   

  1. 复旦大学化学系, 上海 200433
  • 收稿日期:1994-04-06 修回日期:1994-09-10 出版日期:1995-03-24 发布日期:1995-03-24
  • 通讯作者: 夏清华,男,29岁,博士后.
  • 作者简介:夏清华,男,29岁,博士后.
  • 基金资助:

    国家自然科学基金;博士后科学基金

Studies on IR and UV-Vis Spectra Of Ti-Si Zeolites Treated by Adsorption

XIA Qing-Hua, GAO Zi, CHEN Guo-Hui   

  1. Department of Chemistry, Fudan University, Shanghai 200433
  • Received:1994-04-06 Revised:1994-09-10 Online:1995-03-24 Published:1995-03-24

摘要: 用IR和UV-Vis光谱对Ti-Si沸石吸附H2O、H2O2、烯丙基氯后的变化情况进行了研究。观察到H2O2的吸附将引起Ti-Si沸石IR光谱中960cm-1谱带的减弱,同时一个弱带在880cm-1处形成;而在UV-Vis光谱中,吸附H2O2将导致一个新的电子跃迁带在425nm处形成。这时若吸附烯丙基氯,则可发现880cm-1的弱带及UV-Vis425nm的宽带会进一步减弱,同时一个新的IR带重又出现在980cm-1处。吸附H2O2后导致的IR880cm-1弱带的出现及UV-Vis425nm宽带的出现均证实此时在沸石表面形成了过氧钛物种。推测骨架晶格钛可能在H2O2参加的氧化反应中起活性中心作用。

关键词: IR光谱, UV-Vis光谱, 吸附, Ti-Si沸石

Abstract: Ti-Si zeolites treated by adsorption of H2O, H2O2and allyl chloride have been carefully studied by using IR and UV-Vis spectra. It is observed that the adsorption of aqueous H2O2can cause a decrease of the 960 cm-1band of Ti-Si zeolites IR spectra, and a weak band is formed at 880 cm-1which is in the range of -O-O-vibrations reported for Ti peroxo complexes. Furthermore,in the UV-Vis spectra, the H2O2treatment results in the formation of electronic transition band at 425 nm. The 425 nm band is in agreement with 420 nm band of Ti hyroxyperoxo compound, which is ascribed to Ti peroxo species.At that case,if allyl chloride is subsequently adsorbed on the surfaces of Ti-Si zeolites preadsorbed with H2O2, the strength of IRband around 880 cm-1and UV-Vis band at 425 nm will all decrease. Meanwhile,a new IRb and is emerging around 980cm-1.It is suggested that the skeletal lattice titanium may play an active site role in the oxidation using H2O2as the oxidant.

Key words: IR spectra, UV-Vis spectra, Adsorption, Ti-Si zeolites

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