介孔材料
选择性
材料科学
异构化
催化作用
果糖
化学工程
碳纤维
无机化学
化学
有机化学
复合数
工程类
复合材料
作者
Junyan Fu,Feng Shen,Xiaoning Liu,Xinhua Qi
标识
DOI:10.1016/j.gee.2021.11.010
摘要
In-situ MgO-doped ordered mesoporous carbon ([email protected]) was fabricated by formaldehyde-free self-assembly method, in which biomass-derived tannin was used as carbon precursor replacing fossil-based phenolics, Mg2+ as both cross-linker and precursor of catalytic sites. Up to ∼20 wt% MgO could be doped in the carbon skeleton with good dispersion retaining well-ordered mesoporous structures, while more MgO content (35 wt%) led to the failing in the formation of ordered mesoporous structure. The [email protected] possessed a high specific surface area (298.8 m2 g−1), uniform pore size distribution (4.8 nm) and small crystallite size of MgO (1.73 nm) due to the confinement effect of ordered mesoporous structure. Using [email protected] as the heterogeneous catalyst, a maximum fructose yield of 32.4% with a selectivity up to 81.1% was achieved from glucose in water (90 °C, 60 min), which is much higher than that obtained using the MgO doped active carbon via conventional post-impregnation method (26.5% yield with 58.3% selectivity). Higher reaction temperature (>90 °C) resulted in decrease of selectivity due to the formation of humins. The designed [email protected] displayed tolerant to high initial glucose concentrations (10 wt%) and could remain good recyclability without significant loss of activity for three cycles.
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