Synthesis of Mg-K-biochar bimetallic catalyst and its evaluation of glucose isomerization  

作　　者：Xiheng Kang Zi You Jian Peng Arthur J.Ragauskas Jingdong Pang Peitao Zhao Yongjun Yin Xueping Song 

机构地区：[1]Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,College of Light Industry and Food Engineering,Guangxi University,Nanning 530004,People’s Republic of China [2]Department of Chemical and Biomolecular Engineering,University of Tennessee,Knoxville,TN,USA [3]Oak Ridge National Laboratory,Biosciences Division,Joint Institute for Biological Sciences,Oak Ridge,TN,USA [4]Center for Renewable Carbon,Department of Forestry,Wildlife and Fisheries,The University of Tennessee,Knoxville,TN 37996,USA [5]School of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,People’s Republic of China [6]China CAMC Engineering CO.,LTD.,SINOMACH Plaza,No.3,Danling Street,Beijing 100080,People’s Republic of China

出　　处：《Biochar》2023年第1期976-992,共17页生物炭（英文）

基　　金：National Natural Science Foundation of China(Grant No.22268007);Natural Science Foundation of Guangxi Province,China(Grant No.2021GXNSFDA196006);Guangxi Science and Technology Major Pro-gram(Guike AA22117013);National Key Research and Development Program of China(Grant No.2021YFE0114400);Innovation Project of Guangxi Graduate Education(Grant No.YCBZ2023020);Foundation of Guangxi Key Laboratory of Clean Pulp&Papermaking and Pollution Control,College of Light Industry and Food Engineering,Guangxi University(Grant No.2021KF20).AJR efforts were supported University of Tennessee,Knoxville.

摘　　要：Highly efficient isomerization of glucose to fructose is essential for valorizing cellulose fraction of biomass to valueadded chemicals.This work provided an innovative method for preparing Mg-biochar and Mg-K-biochar catalysts by impregnating either MgCl_(2) alone or in combination with different K compounds(Ding et al.in Bioresour Technol 341:125835,2021,https://doi.org/10.1016/j.biort ech.2021.125835 and KHCO_(3))on cellulose-derived biochar,followed by hydrothermal carbonization and pyrolysis.Single active substance MgO existing in the _(10)Mg-C could give better catalytic effect on glucose isomerization than the synergy of MgO and KCl crystalline material present in _(10)Mg-KCl-C.But the catalytic effect of _(10)Mg-C was decreased when the basic site of MgO was overloaded.Compared to other carbon-based metal catalysts,_(10)Mg-KHCO_(3)-C with 10 wt%MgCl_(2) loading had excellent catalytic performance,which gave a higher fructose yield(36.7%)and selectivity(74.54%),and catalyzed excellent glucose conversion(53.99%)at 100℃ in 30 min.Scanning electron microscope-energy dispersive spectrometer and X-Ray diffraction revealed that the distribution of Mg^(Mg^(2+))and K^(+)in _(10)Mg-KHCO_(3)-C was uniform and the catalytic active substances(MgO,KCl and K_(2)CO_(3))were more than _(10)Mg-C(only MgO).The synergy effects of MgO and K_(2)CO_(3) active sites enhanced the pH of reaction system and induced H2O ionization to form considerable OH−ions,thus easily realizing a deprotonation of glucose and effectively catalyzing the isomerization of glucose.In this study,we developed a highly efficient Mg-K-biochar bimetallic catalyst for glucose isomerization and provided an efficient method for cellulose valorization.

关 键 词：ISOMERIZATION Catalyst FRUCTOSE BIOCHAR MGO 

分 类 号：TQ426[化学工程]