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- W2372738222 abstract "Effects of calcination temperature and the acidity of pretreatment reagents on the surface acidity of TS 1 zeolites were studied by using temperature programmed desorption (TPD) adsorbing pyridine. The TPD profiles showed that there were two main kinds of acid sites on the surface of TS 1 zeolites, namely the weak acid site and the strong acid site, whose desorption peak temperatures were located at 480～500 ℃ and 618～627 ℃, respectively. It is postulated that the weak acid sites originated from the framework Ti(Ⅳ) ions and the strong acid sites from the silanol groups at crystal defects, the former helped activating H 2O 2 and the latter might cause by product formation during the hydroxylation of benzene. With the increase of calcinations temperature, the amount of weak acid sites increased and the amount of strong acids decreased. Pretreatment reagents of different acidity may cause the transformation between Ti(OSi) 3(OH) and Ti(OSi) 4 in zeolite framework, changing the relative amount of the two acid sites thus the catalyst activity in hydroxylation of benzene." @default.
- W2372738222 created "2016-06-24" @default.
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- W2372738222 date "2003-01-01" @default.
- W2372738222 modified "2023-09-25" @default.
- W2372738222 title "THE SURFACE ACIDITY OF TS-1 ZEOLITES" @default.
- W2372738222 hasPublicationYear "2003" @default.
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