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

Abstract

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

TrendMD:

XIA Qing-Hua, GAO Zi, CHEN Guo-Hui . Studies on IR and UV-Vis Spectra Of Ti-Si Zeolites Treated by Adsorption[J]. Chem. J. Chinese Universities, 1995, 16(3): 428.

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

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