Effect of silylation temperature on the physicochemical properties and catalytic performance of Ti-containing hexagonal mesoporous silica
- 作者: Li X.1
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隶属关系:
- School of Chemistry and Chemical Engineering
- 期: 卷 89, 编号 10 (2016)
- 页面: 1722-1727
- 栏目: Various Technological Processes
- URL: https://journals.rcsi.science/1070-4272/article/view/214402
- DOI: https://doi.org/10.1134/S1070427216100220
- ID: 214402
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详细
Ti-HMS (hexagonal mesoporous silica, HMS) was vapor silylated at 150–450°C. The samples were characterized by Si29 CP/MAS NMR, FTIR, TG, XRD, and N2-adsorption, respectively, as well as evaluated by the continuous epoxidation of propylene with cumene hydroperoxide (CHP) as oxidant. There showed only a peak at 14 ppm assigned to (CH3)3Si*OSi(OSi)3 species in NMR spectra when silylated at low temperatures. The samples at higher temperatures (>250°C) gave an additional peak at 20 ppm, which was assigned to novel titanium species of (CH3)3Si*OTi(OSi)3. The intensity of peaks relevant to trimethyl groups increased with the silylation temperature at 150–350°C and decreased at 350–450°C due to decomposing of organic groups. The intensity reached the highest point at 350°C. The catalytic results showed that the propylene oxide yield also changed as the same trend and reached the longest life of 100% PO yield at 350°C silylation. In conclusion, 350°C is an optimal silylation temperature.
作者简介
Xuefeng Li
School of Chemistry and Chemical Engineering
编辑信件的主要联系方式.
Email: snow_mount@163.com
中国, Xuchang, 461000
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