Synthesis of MgO-doped ordered mesoporous carbons by Mg^(2+)-tannin coordination for efficient isomerization of glucose to fructose  

作　　者：Junyan Fu Feng Shen Xiaoning Liu Xinhua Qi 

机构地区：[1]College of Environmental Science and Engineering,Nankai University,No.38,Tongyan Road,Jinnan District,Tianjin,300350,China [2]Agro-Environmental Protection Institute,Ministry of Agriculture and Rural Affairs,No.31,Fukang Road,Nankai District,Tianjin,300191,China

出　　处：《Green Energy & Environment》2023年第3期842-851,共10页绿色能源与环境（英文版）

基　　金：supported by the Natural Science Fund for Distinguished Young Scholars of Tianjin (17JCJQJC45500);the National Natural Science Foundation of China (NSFC,21876091 and 22178181);Tianjin Municipal Science and Technology Project (18PTZWHZ00150).

摘　　要：In-situ MgO-doped ordered mesoporous carbon(OMC@MgO)was fabricated by formaldehyde-free self-assembly method,in which biomass-derived tannin was used as carbon precursor replacing fossil-based phenolics,Mg^(2+)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 OMC@MgO possessed a high specific surface area(298.8 m^(2) 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 OMC@MgO 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℃,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℃)resulted in decrease of selectivity due to the formation of humins.The designed OMC@MgO displayed tolerant to high initial glucose concentrations(10 wt%)and could remain good recyclability without significant loss of activity for three cycles.

关 键 词：GLUCOSE FRUCTOSE ISOMERIZATION Porous carbon Biomass CATALYSIS 

分 类 号：TQ426[化学工程] TK6[动力工程及工程热物理—生物能]