摘要：

采用溶胶-凝胶-水热工艺制备了一系列SO^2-₄-TiO₂/MOR(STM)固体酸催化剂。相对SO^2-₄-TiO₂催化剂，制备的STM催化剂有高的硫负载量、大的比表面积和好的分散性。吡啶分子探针-傅里叶变换红外光谱、X射线光电子能谱及Ti2p、S2p和O1s分峰拟合图谱分析表明，硫负载量和结合态、活性组分和丝光沸石载体的相互作用影响到催化剂的B

Abstract:

SO^2-₄-TiO₂ catalysts are active for the hydrolysis of fructose, but they are deactivated in hot water in the next run. SO^2-₄-TiO₂/MOR(STM）solid acid catalysts were successfully prepared to promote or stabilize SO^2-₄-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 O1s peak fitting curves showed that loading and binding state of sulfur, interaction between active components and mordenite carriers made connection to distribution of Bronsted 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.

中图分类号: 

• 10.3969/j.issn.0438-1157.2011.12.016