高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (12): 1926.

• 论文 • 上一篇    下一篇

Ti-Si沸石表面吸附物种的TPSR-TPD研究

夏清华, 高滋   

  1. 复旦大学化学系, 上海, 200433
  • 收稿日期:1994-12-21 修回日期:1995-03-16 出版日期:1995-12-24 发布日期:1995-12-24
  • 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

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

XIA Qing-Hua, GAO Zi   

  1. Department of Chemistry, Fudan University, Shanghai, 200433
  • Received:1994-12-21 Revised:1995-03-16 Online:1995-12-24 Published:1995-12-24

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摘要： 氯丙烯在不同催化剂表面上吸附的TPD结果表明:在TS-1上有三重脱附峰,而在TiO2/Silicalite上仅有单峰。H2O2或分子O2在催化剂表面吸附后,在脱附物种中可用质谱检测到原子O(16)物种;说明HO2或分子O2在样品表面存在解离吸附;并发现解离分子O2的活性很低。TS-1能同时吸附氯丙烯和H2O2,而在SiO2/Silicalite表面的吸附却与吸附顺序有关。环氧化活性顺序如下:TS-1(TPAOH)>TS-1(TPABr+NaOH)>TiO2/Silicalite.TS-1沸石的高氧化活性可能与H2O2吸附后表面原子O(16)的形成有关。

关键词: Ti-Si沸石, H2O2吸附, TPSR-TPD, 氧化

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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