Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium

Sergiy Popov, Isaiah Ruhl, Nirmal Uppugundla, Leonardo Da Costa Sousa, Venkatesh Balan, Patrick G. Hatcher, Sandeep Kumar

Research output: Contribution to journalArticle

  • 1 Citations

Abstract

Bioethanol can be produced from lignocellulosic feedstock using a biochemical route involving enzymatic hydrolysis followed by microbial fermentation. During these processes, about 30 to 40% of the biomass is left behind as wet unhydrolyzed solids (UHS), depending on the type of biomass, enzyme loading, and duration of enzymatic hydrolysis. The UHS is mostly composed of lignin, bound enzymes, undigested recalcitrant carbohydrates and ash. The efficient conversion of UHS into bio-oil will increase the overall conversion efficiency of biomass to liquid fuels (bioethanol and bio-oil) and has the potential to reduce the cost of biofuel production from lignocellulosic biomass. In this paper we report the results of bio-oils production from UHS via hydrothermal liquefaction (HTL) under varying temperatures (280-350°C) and subcritical water conditions. The effects of K2CO3 and supported bimetallic CoMo/Al2O3 catalysts during HTL process were investigated. The UHS used in this study was produced after enzymatic hydrolysis of Ammonia Fiber Expansion (AFEX) pretreated corn stover (ACS). Bio-oil yields at different HTL temperatures were quantified and characterized using 1H-NMR, 13C-NMR, GC-MS, and elemental analysis. The yield of bio-oil was higher in the presence of 5 wt% of K2CO3 during HTL in comparison with CoMo/Al2O3 catalyst. The highest degree of liquefaction (DL) and bio-oil yield were respectively 43.4% and 30.1 wt% at 350°C in the presence of K2CO3 while the highest ECR was 57.1% at 320°C in the presence of K2CO3. The study is one of the first of its kind where unhydrolyzed solids, left behind after bioethanol production, were used for making bio-oils with traditional and reduced bimetallic CoMo/Al2O3 catalysts in an aqueous medium. The results of the study can contribute to the development of the lignocellulosic biomass-based biorefinery concept.

LanguageEnglish (US)
Pages431-446
Number of pages16
JournalBiofuels
Volume5
Issue number4
DOIs
StatePublished - Jul 4 2014

Profile

Liquefaction
liquefaction
Biomass
oil
Bioethanol
Enzymatic hydrolysis
biomass
hydrolysis
catalyst
nuclear magnetic resonance
Ashes
Catalysts
enzyme
Enzymes
Nuclear magnetic resonance
biofuel
Liquid fuels
oil production
lignin
fermentation

Keywords

  • bio-oils
  • biochar
  • hydrothermal liquefaction
  • phenolic compounds
  • unhydrolyzed solids

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

Cite this

Popov, S., Ruhl, I., Uppugundla, N., Da Costa Sousa, L., Balan, V., Hatcher, P. G., & Kumar, S. (2014). Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. Biofuels, 5(4), 431-446. DOI: 10.1080/17597269.2014.987099

Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. / Popov, Sergiy; Ruhl, Isaiah; Uppugundla, Nirmal; Da Costa Sousa, Leonardo; Balan, Venkatesh; Hatcher, Patrick G.; Kumar, Sandeep.

In: Biofuels, Vol. 5, No. 4, 04.07.2014, p. 431-446.

Research output: Contribution to journalArticle

Popov, S, Ruhl, I, Uppugundla, N, Da Costa Sousa, L, Balan, V, Hatcher, PG & Kumar, S 2014, 'Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium' Biofuels, vol 5, no. 4, pp. 431-446. DOI: 10.1080/17597269.2014.987099
Popov S, Ruhl I, Uppugundla N, Da Costa Sousa L, Balan V, Hatcher PG et al. Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. Biofuels. 2014 Jul 4;5(4):431-446. Available from, DOI: 10.1080/17597269.2014.987099
Popov, Sergiy ; Ruhl, Isaiah ; Uppugundla, Nirmal ; Da Costa Sousa, Leonardo ; Balan, Venkatesh ; Hatcher, Patrick G. ; Kumar, Sandeep. / Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium. In: Biofuels. 2014 ; Vol. 5, No. 4. pp. 431-446
@article{952c7cbb7f214706bc2d4c9ec295800b,
title = "Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium",
abstract = "Bioethanol can be produced from lignocellulosic feedstock using a biochemical route involving enzymatic hydrolysis followed by microbial fermentation. During these processes, about 30 to 40{\%} of the biomass is left behind as wet unhydrolyzed solids (UHS), depending on the type of biomass, enzyme loading, and duration of enzymatic hydrolysis. The UHS is mostly composed of lignin, bound enzymes, undigested recalcitrant carbohydrates and ash. The efficient conversion of UHS into bio-oil will increase the overall conversion efficiency of biomass to liquid fuels (bioethanol and bio-oil) and has the potential to reduce the cost of biofuel production from lignocellulosic biomass. In this paper we report the results of bio-oils production from UHS via hydrothermal liquefaction (HTL) under varying temperatures (280-350°C) and subcritical water conditions. The effects of K2CO3 and supported bimetallic CoMo/Al2O3 catalysts during HTL process were investigated. The UHS used in this study was produced after enzymatic hydrolysis of Ammonia Fiber Expansion (AFEX) pretreated corn stover (ACS). Bio-oil yields at different HTL temperatures were quantified and characterized using 1H-NMR, 13C-NMR, GC-MS, and elemental analysis. The yield of bio-oil was higher in the presence of 5 wt{\%} of K2CO3 during HTL in comparison with CoMo/Al2O3 catalyst. The highest degree of liquefaction (DL) and bio-oil yield were respectively 43.4{\%} and 30.1 wt{\%} at 350°C in the presence of K2CO3 while the highest ECR was 57.1{\%} at 320°C in the presence of K2CO3. The study is one of the first of its kind where unhydrolyzed solids, left behind after bioethanol production, were used for making bio-oils with traditional and reduced bimetallic CoMo/Al2O3 catalysts in an aqueous medium. The results of the study can contribute to the development of the lignocellulosic biomass-based biorefinery concept.",
keywords = "bio-oils, biochar, hydrothermal liquefaction, phenolic compounds, unhydrolyzed solids",
author = "Sergiy Popov and Isaiah Ruhl and Nirmal Uppugundla and {Da Costa Sousa}, Leonardo and Venkatesh Balan and Hatcher, {Patrick G.} and Sandeep Kumar",
year = "2014",
month = "7",
day = "4",
doi = "10.1080/17597269.2014.987099",
language = "English (US)",
volume = "5",
pages = "431--446",
journal = "Biofuels",
issn = "1759-7269",
publisher = "Future Science",
number = "4",

}

TY - JOUR

T1 - Bio-oil via catalytic liquefaction of unhydrolyzed solids in aqueous medium

AU - Popov,Sergiy

AU - Ruhl,Isaiah

AU - Uppugundla,Nirmal

AU - Da Costa Sousa,Leonardo

AU - Balan,Venkatesh

AU - Hatcher,Patrick G.

AU - Kumar,Sandeep

PY - 2014/7/4

Y1 - 2014/7/4

N2 - Bioethanol can be produced from lignocellulosic feedstock using a biochemical route involving enzymatic hydrolysis followed by microbial fermentation. During these processes, about 30 to 40% of the biomass is left behind as wet unhydrolyzed solids (UHS), depending on the type of biomass, enzyme loading, and duration of enzymatic hydrolysis. The UHS is mostly composed of lignin, bound enzymes, undigested recalcitrant carbohydrates and ash. The efficient conversion of UHS into bio-oil will increase the overall conversion efficiency of biomass to liquid fuels (bioethanol and bio-oil) and has the potential to reduce the cost of biofuel production from lignocellulosic biomass. In this paper we report the results of bio-oils production from UHS via hydrothermal liquefaction (HTL) under varying temperatures (280-350°C) and subcritical water conditions. The effects of K2CO3 and supported bimetallic CoMo/Al2O3 catalysts during HTL process were investigated. The UHS used in this study was produced after enzymatic hydrolysis of Ammonia Fiber Expansion (AFEX) pretreated corn stover (ACS). Bio-oil yields at different HTL temperatures were quantified and characterized using 1H-NMR, 13C-NMR, GC-MS, and elemental analysis. The yield of bio-oil was higher in the presence of 5 wt% of K2CO3 during HTL in comparison with CoMo/Al2O3 catalyst. The highest degree of liquefaction (DL) and bio-oil yield were respectively 43.4% and 30.1 wt% at 350°C in the presence of K2CO3 while the highest ECR was 57.1% at 320°C in the presence of K2CO3. The study is one of the first of its kind where unhydrolyzed solids, left behind after bioethanol production, were used for making bio-oils with traditional and reduced bimetallic CoMo/Al2O3 catalysts in an aqueous medium. The results of the study can contribute to the development of the lignocellulosic biomass-based biorefinery concept.

AB - Bioethanol can be produced from lignocellulosic feedstock using a biochemical route involving enzymatic hydrolysis followed by microbial fermentation. During these processes, about 30 to 40% of the biomass is left behind as wet unhydrolyzed solids (UHS), depending on the type of biomass, enzyme loading, and duration of enzymatic hydrolysis. The UHS is mostly composed of lignin, bound enzymes, undigested recalcitrant carbohydrates and ash. The efficient conversion of UHS into bio-oil will increase the overall conversion efficiency of biomass to liquid fuels (bioethanol and bio-oil) and has the potential to reduce the cost of biofuel production from lignocellulosic biomass. In this paper we report the results of bio-oils production from UHS via hydrothermal liquefaction (HTL) under varying temperatures (280-350°C) and subcritical water conditions. The effects of K2CO3 and supported bimetallic CoMo/Al2O3 catalysts during HTL process were investigated. The UHS used in this study was produced after enzymatic hydrolysis of Ammonia Fiber Expansion (AFEX) pretreated corn stover (ACS). Bio-oil yields at different HTL temperatures were quantified and characterized using 1H-NMR, 13C-NMR, GC-MS, and elemental analysis. The yield of bio-oil was higher in the presence of 5 wt% of K2CO3 during HTL in comparison with CoMo/Al2O3 catalyst. The highest degree of liquefaction (DL) and bio-oil yield were respectively 43.4% and 30.1 wt% at 350°C in the presence of K2CO3 while the highest ECR was 57.1% at 320°C in the presence of K2CO3. The study is one of the first of its kind where unhydrolyzed solids, left behind after bioethanol production, were used for making bio-oils with traditional and reduced bimetallic CoMo/Al2O3 catalysts in an aqueous medium. The results of the study can contribute to the development of the lignocellulosic biomass-based biorefinery concept.

KW - bio-oils

KW - biochar

KW - hydrothermal liquefaction

KW - phenolic compounds

KW - unhydrolyzed solids

UR - http://www.scopus.com/inward/record.url?scp=84938683306&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84938683306&partnerID=8YFLogxK

U2 - 10.1080/17597269.2014.987099

DO - 10.1080/17597269.2014.987099

M3 - Article

VL - 5

SP - 431

EP - 446

JO - Biofuels

T2 - Biofuels

JF - Biofuels

SN - 1759-7269

IS - 4

ER -