Efficient oxidation of monosaccharides to sugar acids under neutral condition in flow reactors with gold-supported activated carbon catalysts  

作　　者：Ziqin Gong Zengyong Li Xu Zeng Fengxia Yue Wu Lan Chuanfu Liu 

机构地区：[1]State Key Laboratory of Pulp and Paper Engineering,School of Light Industry&Engineering,South China University of Technology,Guangzhou 510640,China [2]Anhui Provincial Engineering Center for High Performance Biobased Nylons,School of Materials and Chemistry,Anhui Agricultural University,Hefei 230036,China

出　　处：《Frontiers of Chemical Science and Engineering》2024年第9期113-123,共11页化学科学与工程前沿（英文版）

基　　金：support from the National Key Research and Development Program of China(Grant No.2021YFC2101604);the National Natural Science Foundation of China(Grant No.22108088);the Natural Science Foundation of Guangdong,China(Grant No.2023A1515012740)。

摘　　要：A significant reaction in the synthesis of biomass-based chemicals is the catalyst-based and targeted oxidation of monosaccharides into valuable sugar acids.In this study,an activated carbon supported gold catalyst was used to oxidize glucose and xylose to gluconic acid and xylonic acid under neutral condition.Optimization of reaction conditions for the catalysts was performed using both a batch reactor and a flow-through reactor.In a batch reactor,the yields of gluconic and xylonic acid reached 93%and 92%,respectively,at 90℃ within 180 min.In a flow reactor,both reactions reached a similar yield at 80℃ with the weight hourly space velocity of 47.1 h^(-1).The reaction kinetics were explored in the flow reactor.The oxidation of glucose and xylose to gluconic and xylonic acid followed a first-order kinetics and the turnover frequency was 0.195 and 0.161 s^(-1),respectively.The activation energy was evaluated to be 60.58 and 59.30 kJ·mol^(-1),respectively.This study presents an environmentally friendly and feasible method for the selective oxidation of monosaccharides using an activated carbon supported gold catalyst,benefiting the high-value application of carbohydrates.

关 键 词：monosaccharides oxidation gluconic acid xylonic acid flow reactor KINETICS 

分 类 号：O643[理学—物理化学]