Investigaions on TPSR-TPD of H2O2,O2and Allyl Chloride Species Adsorbed on Ti-Si Zeolites

Abstract

Abstract: In the TPSR-TPD curves of allyl chloride, there are multiple desorption peaks (amount to triplet)on TS-1 zeolites,however there is only a single desorption peak on TiO₂/silicalite. After the adsorption of H₂O₂or molecular O₂separately,O(16)atoms are discovered in the desorbed species by MS. It is found that the activity of the samples dissociating molecular O₂into atomic O(16)is low. TS-1 zeolites can simultaneously adsorb H₂O₂and allyl chloride, but the adsorption of both of them on TiO₂/silicalite surface is relevant to adsorptive sequence, The order of epoxidation activity is as follows:TS-1(TPAOH)>TS-1 (TPABr+NaOH)>TiO₂/silicalite, It is postulated that the higher oxidation activity of Ti-Si zeolites is related to the formation of surface O(16)atoms adsorbed on the zeolites after the adsorption of H₂O₂.

Key words: Ti-Si zeolite, H₂O₂adsorption, TPSR-TPD, Oxidation

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XIA Qing-Hua, GAO Zi. Investigaions on TPSR-TPD of H₂O₂,O₂and Allyl Chloride Species Adsorbed on Ti-Si Zeolites[J]. Chem. J. Chinese Universities, 1995, 16(12): 1926.

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Investigaions on TPSR-TPD of H₂O₂,O₂and Allyl Chloride Species Adsorbed on Ti-Si Zeolites

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