Release Time:2025-06-03  Hits:

Indexed by: Journal Article

Date of Publication: 2022-06-30

Journal: 石油学报 石油加工

Institution: 化工学院

Issue: 2

Page Number: 34-40

ISSN: 1001-8719

Abstract: Titanium silicalite-1 (TS-1) was successfully synthesized in the system of TPABr-n-butylamine in 100 l stainless-steel autoclave. The synthesized materials were characterized by many techniques, such as, IR, XRD, UV-Vis, XRF, Raman spectroscopy, SEM and 27Al MAS NMR. The thermostability of TS-1 synthesized by using TPABr as the template, which is expected to be cheaper raw materials in future use, was investigated. The results showed that, when the calcination temperature was lower than 1100��C, there observed no changes in IR and UV-Vis spectra. But, when the calcination temperature was above 1100��C, the intensity of 960 cm-1 examined by IR and the relative crystallinity by XRD decreased. When the calcination temperature was up to 1300��C, the framework of TS-1 collapsed and converted into ��-cristobalite. The epoxidation properties of TS-1 showed that the calcination temperature played an important role on catalytic properties of TS-1. When the calcination temperature was above 900��C, the activity of TS-1 decreased drastically. During the calcination of TS-1, the extra-framework titanium converted into rutile. During the synthesis of TS-1 with TPAOH as the template, the extra-framework existed in the form of anatase, even if calcination temperature was as high as 1300��C, it could not convert into rutile.

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