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Title: An electrogenerated base for the alkaline oxidative pretreatment of lignocellulosic biomass to produce bioethanol

In this study, we aimed to develop an alternative base to substitute for NaOH for use in alkaline oxidative biomass pretreatment. An electrogenerated base (EGB) from water electrolysis was employed in the alkaline oxidative pretreatment of corn stover (CS). Similar to NaOH, when the EGB was used in pretreatment, 56.6% of the original lignin was removed after 6 h pretreatment, leading to significantly enhanced enzymatic digestibility. The glucan digestibility of the pretreated CS was 3.8 times higher than that of raw CS after 24 h. The ethanol metabolic yields were 64.6% and 72.4% when using activated carbon detoxified hydrolysate or hydrolysate at pH 5.5, respectively. These results demonstrate that an EGB, a byproduct from various electrocatalytic processes, could be used as a potential replacement for NaOH. Moreover, we propose a new biorefinery concept, which combines water electrolysis, biological conversion and thermochemical/catalytic conversion to produce bioethanol, hydrogen, hydrocarbon fuels and valuable chemicals.
Authors:
ORCiD logo [1] ;  [2]
  1. Qilu Univ. of Technology, Jinan (China). Dept. of Bioengineering
  2. Michigan State Univ., East Lansing, MI (United States). Dept. of Chemical Engineering and Materials Science. Dept. of Biosystems and Agricultural Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; ZR2014BM031; 2015GSF121022
Type:
Accepted Manuscript
Journal Name:
RSC Advances
Additional Journal Information:
Journal Volume: 7; Journal Issue: 75; Journal ID: ISSN 2046-2069
Publisher:
Royal Society of Chemistry
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Qilu Univ. of Technology, Jinan (China)
Sponsoring Org:
USDOE; Natural Science Foundation of Shandong Province (China); Major Research & Development Program of Shandong Province (China)
Country of Publication:
United States
Language:
English
Subject:
09 BIOMASS FUELS
OSTI Identifier:
1471884

Liu, Tongjun, and Li, Zhenglong. An electrogenerated base for the alkaline oxidative pretreatment of lignocellulosic biomass to produce bioethanol. United States: N. p., Web. doi:10.1039/C7RA08101D.
Liu, Tongjun, & Li, Zhenglong. An electrogenerated base for the alkaline oxidative pretreatment of lignocellulosic biomass to produce bioethanol. United States. doi:10.1039/C7RA08101D.
Liu, Tongjun, and Li, Zhenglong. 2017. "An electrogenerated base for the alkaline oxidative pretreatment of lignocellulosic biomass to produce bioethanol". United States. doi:10.1039/C7RA08101D. https://www.osti.gov/servlets/purl/1471884.
@article{osti_1471884,
title = {An electrogenerated base for the alkaline oxidative pretreatment of lignocellulosic biomass to produce bioethanol},
author = {Liu, Tongjun and Li, Zhenglong},
abstractNote = {In this study, we aimed to develop an alternative base to substitute for NaOH for use in alkaline oxidative biomass pretreatment. An electrogenerated base (EGB) from water electrolysis was employed in the alkaline oxidative pretreatment of corn stover (CS). Similar to NaOH, when the EGB was used in pretreatment, 56.6% of the original lignin was removed after 6 h pretreatment, leading to significantly enhanced enzymatic digestibility. The glucan digestibility of the pretreated CS was 3.8 times higher than that of raw CS after 24 h. The ethanol metabolic yields were 64.6% and 72.4% when using activated carbon detoxified hydrolysate or hydrolysate at pH 5.5, respectively. These results demonstrate that an EGB, a byproduct from various electrocatalytic processes, could be used as a potential replacement for NaOH. Moreover, we propose a new biorefinery concept, which combines water electrolysis, biological conversion and thermochemical/catalytic conversion to produce bioethanol, hydrogen, hydrocarbon fuels and valuable chemicals.},
doi = {10.1039/C7RA08101D},
journal = {RSC Advances},
number = 75,
volume = 7,
place = {United States},
year = {2017},
month = {10}
}

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