SO 4 2--TiO 2/MOR as novel solid acid catalyst for dehydration of fructose to 5-hydroxymethylfurfural

被引：0
|
作者：
Shen X. [1 ]
Wei X. [1 ]
Wang Y. [2 ]
Qian K. [1 ]
Li R. [1 ]
Hu Z. [1 ]
机构：
[1] Engineering Research Center of Nano-Geo Materials of Ministry of Education, School of Materials Science and Chemical Engineering, China University of Geosciences, Wuhan 430074, Hubei
[2] State Key Laboratory of Biogeology and Environmental Geology, School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei
来源：
Huagong Xuebao/CIESC Journal | 2011年 / 62卷 / 12期
关键词：
5-hydroxymethylfukfural; Fructose dehydration; Mordenite; SO [!sub]4[!/sub] [!sup]2-[!/sup]-TiO [!sub]2[!/sub] solid acid;
D O I：
10.3969/j.issn.0438-1157.2011.12.016
中图分类号：
学科分类号：
摘要：
SO 4 2--TiO 2 catalysts are active for the hydrolysis of fructose, but they are deactivated in hot water in the next run. SO 4 2--TiO 2/MOR (STM) solid acid catalysts were successfully prepared to promote or stabilize SO 4 2--TiO 2 by using the sol-gel-hydrothermal new process. The activated natural mordenite (MOR) supports had low costs, abundant microporous structure with high BET surface area, excellent thermal stability and easy recycling. As nanosized TiO 2 could interact with the structural hydroxide of MORs, a binary STM catalyst was expected to be more acidic than either material alone. The binary mesoporous catalysts with high sulfate loading, high BET surface area and good dispersion showed better catalytic activities. The analysis results of pyridine molecular probe-Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy and Ti2p, S2p and O1s peak fitting curves showed that loading and binding state of sulfur, interaction between active components and mordenite carriers made connection to distribution of Brønsted acid sites and Lewis acid sites. The 5-hydroxymethylfurfural (HMF) yield and fructose conversion for STM 0.2 catalyst reached 71.6% and 91.9% respectively. Recycling experiments showed that activities of STM 0.2 catalysts decreased with increasing recycling times, the HMF yield declined to 44.5% in the third cycle. The Lewis acid sites of titanium dioxide helped to promote the conversion of fructose. Mordenite supports could improve the heat resistance of catalyst and the selectivity of target product. © All Rights Reserved.
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页码：3411 / 3418
页数：7
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