A comprehensive review on the framework to valorise lignocellulosic biomass as biorefinery feedstocks

Vu, Hang P.; Nguyen, Dinh Duc; Vu, Minh T.; Johir, Abu Hasan; McLaughlan, Robert; Nghiem, Long D.

doi:10.1016/j.scitotenv.2020.140630

Cited by 191 publications

(87 citation statements)

References 147 publications

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“…Among the factors which contribute to recalcitrance, those linked to the composition of the LB, such as hemicellulose or lignin content, can be distinguished from structural factors, including porosity, specific surface area of the cellulose, and ultrastructural factors related to cellulose (crystallinity, degree of polymerisation) [ 7 ]. The goal of pretreatment is precisely to reduce LB recalcitrance by “opening” the polymer network thereby improving the enzymes’ access to LB, notably to cellulose [ 4 , 10 ]. Different pretreatments have been developed to break down and restructure the lignocellulosic matrix [ 8 , 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluating polymer interplay after hot water pretreatment to investigate maize stem internode recalcitrance

Leroy

Falourd

Foucat

et al. 2021

Biotechnol Biofuels

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Background Biomass recalcitrance is governed by various molecular and structural factors but the interplay between these multiscale factors remains unclear. In this study, hot water pretreatment (HWP) was applied to maize stem internodes to highlight the impact of the ultrastructure of the polymers and their interactions on the accessibility and recalcitrance of the lignocellulosic biomass. The impact of HWP was analysed at different scales, from the polymer ultrastructure or water mobility to the cell wall organisation by combining complementary compositional, spectral and NMR analyses. Results HWP increased the kinetics and yield of saccharification. Chemical characterisation showed that HWP altered cell wall composition with a loss of hemicelluloses (up to 45% in the 40-min HWP) and of ferulic acid cross-linking associated with lignin enrichment. The lignin structure was also altered (up to 35% reduction in β–O–4 bonds), associated with slight depolymerisation/repolymerisation depending on the length of treatment. The increase in $${T}_{1\rho }^{H}$$ T 1 ρ H , $${T}_{HH}$$ T HH and specific surface area (SSA) showed that the cellulose environment was looser after pretreatment. These changes were linked to the increased accessibility of more constrained water to the cellulose in the 5–15 nm pore size range. Conclusion The loss of hemicelluloses and changes in polymer structural features caused by HWP led to reorganisation of the lignocellulose matrix. These modifications increased the SSA and redistributed the water thereby increasing the accessibility of cellulases and enhancing hydrolysis. Interestingly, lignin content did not have a negative impact on enzymatic hydrolysis but a higher lignin condensed state appeared to promote saccharification. The environment and organisation of lignin is thus more important than its concentration in explaining cellulose accessibility. Elucidating the interactions between polymers is the key to understanding LB recalcitrance and to identifying the best severity conditions to optimise HWP in sustainable biorefineries.

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Section: Introductionmentioning

confidence: 99%

Evaluating polymer interplay after hot water pretreatment to investigate maize stem internode recalcitrance

Leroy

Falourd

Foucat

et al. 2021

Biotechnol Biofuels

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“…However, forest residues have a high lignin content, so they are not preferred for biorefinery feedstock. Low lignin content promotes a cost-effective pretreatment and conversion into biofuel [22].…”

Section: Lignocellulosic Biomass Structurementioning

confidence: 99%

Advances in Valorization of Lignocellulosic Biomass towards Energy Generation

et al. 2021

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The booming demand for energy across the world, especially for petroleum-based fuels, has led to the search for a long-term solution as a perfect source of sustainable energy. Lignocellulosic biomass resolves this obstacle as it is a readily available, inexpensive, and renewable fuel source that fulfills the criteria of sustainability. Valorization of lignocellulosic biomass and its components into value-added products maximizes the energy output and promotes the approach of lignocellulosic biorefinery. However, disruption of the recalcitrant structure of lignocellulosic biomass (LCB) via pretreatment technologies is costly and power-/heat-consuming. Therefore, devising an effective pretreatment method is a challenge. Likewise, the thermochemical and biological lignocellulosic conversion poses problems of efficiency, operational costs, and energy consumption. The advent of integrated technologies would probably resolve this problem. However, it is yet to be explored how to make it applicable at a commercial scale. This article will concisely review basic concepts of lignocellulosic composition and the routes opted by them to produce bioenergy. Moreover, it will also discuss the pros and cons of the pretreatment and conversion methods of lignocellulosic biomass. This critical analysis will bring to light the solutions for efficient and cost-effective conversion of lignocellulosic biomass that would pave the way for the development of sustainable energy systems.

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“…Current methods of formic acid production are mainly based on fossil resources with a negative impact on the environment 3 . Developing alternative routes to directly produce formic acid from sustainable biomass or biomass-derived waste products is desirable from both ecological and economic perspectives 1,[10][11][12] . Various promising methods were proposed for the rapid conversion of biomass into high-value chemicals [13][14][15][16][17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Formation of Formic Acid from Glucose with Simultaneous Conversion of Ag2O to Ag under Mild Hydrothermal Conditions

He¹,

Ma³

et al. 2021

Preprint

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Formation of formic acid from renewable biomass resources is of great interest since formic acid is a widely used platform chemical and has recently been regarded as an important liquid hydrogen carrier. Herein, a novel approach is reported for the conversion of glucose, the constituent carbohydrate from cellulose fraction of biomass, to formic acid under mild hydrothermal conditions with simultaneous reduction of Ag2O to Ag. Results showed that glucose was selectively converted to formic acid with an optimum yield of 40.7% at a mild reaction temperature of 135 for 30 min. In addition, Ag2O was used as a solid oxidant for the glucose oxidation, which avoids the use of traditionally dangerous liquid oxidant H2O2. Furthermore, complete conversion of Ag2O to Ag can be achieved. This study not only developed a new method for value-added chemical production from renewable biomass but also explored an alternative low-carbon and energy-saving route for silver extraction and recovery.

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A comprehensive review on the framework to valorise lignocellulosic biomass as biorefinery feedstocks

Cited by 191 publications

References 147 publications

Evaluating polymer interplay after hot water pretreatment to investigate maize stem internode recalcitrance

Evaluating polymer interplay after hot water pretreatment to investigate maize stem internode recalcitrance

Advances in Valorization of Lignocellulosic Biomass towards Energy Generation

Formation of Formic Acid from Glucose with Simultaneous Conversion of Ag2O to Ag under Mild Hydrothermal Conditions

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