经过吸附处理的Ti－Si沸石的IR和UV－Vis光谱研究  

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

作　　者：夏清华[1] 高滋[1] 陈国辉[1] 

机构地区：[1]复旦大学化学系

出　　处：《高等学校化学学报》1995年第3期428-431,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金;博士后科学基金

摘　　要：用ＩＲ和ＵＶ－Ｖｉｓ光谱对Ｔｉ－Ｓｉ沸石吸附Ｈ_（２）Ｏ、Ｈ_（２）Ｏ_２、烯丙基氯后的变化情况进行了研究。观察到Ｈ_（２）Ｏ_２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Ｈ_２Ｏ_２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Ｈ_２Ｏ_２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Ｈ_２Ｏ_２参加的氧化反应中起活性中心作用。Ti-Si zeolites treated by adsorption of H2O, H2O2 and allyl chloride have been carefully studied by using IR and UV-Vis spectra. It is observed that the adsorption of aqueous H2O2 can cause a decrease of the 960 cm-1 band of Ti-Si zeolites IR spectra, and a weak band is formed at 880 cm-1 which is in the range of O O vibrations reported for Ti peroxo complexes. Furthermore,in the UV-Vis spectra, the H2O2 treatment 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 IR band around 880 cm-1 and UV-Vis band at 425 nm will all decrease. Meanwhile,a new IR band is emerging around 980 cm-1.It is suggested that the skeletal lattice titanium may play an active site role in the oxidation using H2O2 as the oxidant.

关 键 词：吸附 沸石 过氧化氢 钛 硅 

分 类 号：TQ424.25[化学工程] O657.3[理学—分析化学]