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

Journal Article · · Biochar (Online)
 [1];  [1];  [1];  [2];  [3];  [4];  [1];  [1]
  1. Guangxi Univ., Nanning (China)
  2. Univ. of Tennessee, Knoxville, TN (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Joint Institute for Biological Sciences (JIBS)
  3. China CAMC Engineering CO., LTD., Beijing (China)
  4. China Univ. of Mining and Technology, Xuzhou, Jiangsu (China)
Highly efficient isomerization of glucose to fructose is essential for valorizing cellulose fraction of biomass to value-added chemicals. This work provided an innovative method for preparing Mg-biochar and Mg–K-biochar catalysts by impregnating either MgCl2 alone or in combination with different K compounds (Ding et al. in Bioresour Technol 341:125835, 2021, https://doi.org/10.1016/j.biortech.2021.125835 and KHCO3) on cellulose-derived biochar, followed by hydrothermal carbonization and pyrolysis. Single active substance MgO existing in the 10Mg–C could give better catalytic effect on glucose isomerization than the synergy of MgO and KCl crystalline material present in 10Mg–KCl–C. But the catalytic effect of 10Mg–C was decreased when the basic site of MgO was overloaded. Compared to other carbon-based metal catalysts, 10Mg–KHCO3–C with 10 wt% MgCl2 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 °C in 30 min. Scanning electron microscope–energy dispersive spectrometer and X-Ray diffraction revealed that the distribution of Mg2+ and K+ in 10Mg–KHCO3–C was uniform and the catalytic active substances (MgO, KCl and K2CO3) were more than 10Mg–C (only MgO). The synergy effects of MgO and K2CO3 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.
Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
Guangxi University; Innovation Project of Guangxi Graduate Education; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Guangxi Province, China; USDOE
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2001376
Journal Information:
Biochar (Online), Journal Name: Biochar (Online) Journal Issue: 1 Vol. 5; ISSN 2524-7867
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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