化工学报2011，Vol.62Issue(12)：3411-3418,8.DOI:10.3969/j.issn.0438-1157.2011.12.016
SO2- -TiO2/MOR新型固体酸催化果糖制备5-羟甲基糠醛
SO2-4-TiO2/MOR as novel solid acid catalyst for dehydration of fructose to 5-hydroxymethylfurfural
摘要
Abstract
SO42--TiO2 catalysts are active for the hydrolysis of fructose, but they are deactivated in hot water in the next run. SO42--TiO2/MOR (STM) solid acid catalysts were successfully prepared to promote or stabilize SO42--TiO2 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 TiO2 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 Ols peak fitting curves showed that loading and binding state of sulfur, interaction between active components and mordenite carriers made connection to distribution of Bransted acid sites and Lewis acid sites. The 5-hydroxymethylfurfural (HMF) yield and fructose conversion for STM0.2 catalyst reached 71.6% and 91.9% respectively. Recycling experiments showed that activities of STM0.2 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.关键词
丝光沸石/SO2-4--TiO2固体酸/果糖脱水反应/5-羟甲基糠醛Key words
mordenite/ SO42---TiO2 solid acid/ fructose dehydration/ 5-hydroxymethylfukfural分类
化学化工引用本文复制引用
沈翔,魏小荣,王焰新,钱坤,李锐,胡志海..SO2- -TiO2/MOR新型固体酸催化果糖制备5-羟甲基糠醛[J].化工学报,2011,62(12):3411-3418,8.基金项目
国家自然科学基金项目(40830748) （40830748）
中央高校基本科研业务费专项资金项目(CUGL100203) （CUGL100203）
中国博士后科学基金项目(20090451092). （20090451092）
