Biomass pretreatment: Fundamentals toward application

Agbor, Valery; Çiçek, Nazim; Sparling, Richard; Berlin, Alex; Levin, David B.

doi:10.1016/j.biotechadv.2011.05.005

Cited by 1,592 publications

(927 citation statements)

References 94 publications

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“…In addition to being inexpensive, lignocellulosic biomass offers sustainability and a high potential to reduce greenhouse gas emissions (Perlack et al, 2005;Zhou et al, 2011). However, one of the main challenges in converting biomass into alcohols involves disruption of the complex structure of the biomass to obtain fermentable monomeric sugars (Kumar et al, 2009;Agbor et al, 2011). Usually, physico-chemical pre-treatments are required to ensure that biomass becomes accessible to enzymes for hydrolysis either via removal of lignin or solubilisation of hemicellulose (Mosier et al, 2005;Alvira et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Pre-treatment of biomasses using magnetised sulfonic acid catalysts

Ansanay

Kolar

Sharma-Shivappa

et al. 2017

J Agricult Engineer

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There is a significant interest in employing solid acid catalysts for pre-treatment of biomasses for subsequent hydrolysis into sugars, because solid acid catalysts facilitate reusability, high activity, and easier separation. Hence the present research investigated pretreatment of four lignocellulosic biomasses, namely Switchgrass (Panicum virgatum L 'Alamo'), Gamagrass (Tripsacum dactyloides), Miscanthus (Miscanthus × giganteus) and Triticale hay (Triticale hexaploide Lart.) at 90°C for 2 h using three carbon-supported sulfonic acid catalysts. The catalysts were synthesized via impregnating p-Toluenesulfonic acid on carbon (regular) and further impregnated with iron nitrate via two methods to obtain magnetic A and magnetic B catalysts. When tested as pre-treatment agents, a maximum total lignin reduction of 17.73±0.63% was observed for Triticale hay treated with magnetic A catalyst. Furthermore, maximum glucose yield after enzymatic hydrolysis was observed to be 203.47±5.09 mg g -1 (conversion of 65.07±1.63%) from Switchgrass treated with magnetic A catalyst. When reusability of magnetised catalysts were tested, it was observed that magnetic A catalyst was consistent for Gamagrass, Miscanthus × Giganteus and Triticale hay, while magnetic B catalyst was found to maintain consistent yield for switchgrass feedstock. Our results suggested that magnetised solid acid catalyst could pre-treat various biomass stocks and also can potentially reduce the use of harsh chemicals and make bioenergy processes environment friendly.

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Section: Introductionmentioning

confidence: 99%

Pre-treatment of biomasses using magnetised sulfonic acid catalysts

Ansanay

Kolar

Sharma-Shivappa

et al. 2017

J Agricult Engineer

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show abstract

“…Recently, in response to the depletion of fossil fuel resources, fractionation of lignocelluloses into constituent biopolymers -cellulose, hemicelluloses, and lignin, etc., and their applications represent great potential for providing natural chemicals and materials as alternative sources to fossil fuel-based products (Agbor et al 2011;Deutschmann and Dekker 2012;Doherty et al 2011). Hemicelluloses are heterogeneous polysaccharides composed of glucose, xylose, mannose, galactose, arabinose, and rhamnose together with uronic acids, which are specially combined according to the plant species and the living conditions.…”

Section: Graded Ethanol Fractionation and Structural Characterizationmentioning

confidence: 99%

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Peng¹,

Bian²,

Li³

et al. 2013

BioResources

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Dewaxed Olea europaea L. was subjected to delignification followed by alkali extraction with 10% KOH containing 1% H 3 BO 3 . The released hemicelluloses were fractionated by precipitation through acidification and ethanol solutions with increasing concentrations from 20 to 30, 40, 50, 60, 70, and 90%. The structure of the subfractions obtained was comparatively characterized by sugar analysis, molecular weight, FT-IR, and NMR spectroscopy. Results indicated that 23.5% of hemicelluloses (% of the dewaxed material) were isolated by the alkaline extraction. An increase of ethanol concentration resulted in the precipitation of the more branched hemicelluloses as indicated by the increase of the ratios of arabinose to xylose and uronic acids to xylose. The hemicellulose subfractions Ha (precipitated by acidification to pH 5.5) and H30 (precipitated by 30% ethanol solution) had a similar structure, which was assumed to be glucuroxylan together with a small amount of α-glucan, whereas the hemicellulose subfraction H70 (precipitated by 70% ethanol solution) had a more complicated structure, which was mainly composed of a (1→4)-linked β-D-xylopyranosyl backbone with various side chains. The comprehensive structural characterization of the hemicelluloses of this species provides fundamental information for their potential applications in the fields of materials, chemicals, and energy production.

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“…An essential need for development of renewable and eco-friendly energy resources is emerging due to the global rise in energy consumption, predicted increase in energy demands in the near future, depletion of fossil fuel reserves with low extraction cost, and climate change (Agbor et al 2011). Lignocellulosic biomass is regarded as an attractive substrate for a wide range of potential uses because of its renewability, large available quantities, and potential environmental benefits (Miret et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Hybridization Improves Inhibitor Tolerance of Xylose-fermenting Saccharomyces cerevisiae

Li¹,

Zhu²,

Li³

et al. 2017

BioResources

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Although some engineered S. cerevisiae strains exhibit good xylose utilization ability, the lack of tolerance to inhibitors generated in biomass pretreatment limits the application of such strains in the production of bioethanol from lignocellulosic biomass. By applying a sexual mating method, inhibitor tolerance was developed in xylose-utilizing strains. The final ethanol concentrations in simultaneous scarification and cofermentation (SScF) process at 38 °C with hybrid strains were 50% higher than the SScF process with the xylose-fermenting parent strain. The strain viability of the hybrid strain E7-12 at 24 h was 282 times higher than the parent strain in the SScF process at 25% solid loading. Due to the improved sugar utilization, the final ethanol concentration reached 69.7 g/L (E7-11) and 70.0 g/L (E7-12), which were 25.3 g/L and 25.6 g/L higher than that of SScF with the xylose-fermenting strain, respectively.

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Biomass pretreatment: Fundamentals toward application

Cited by 1,592 publications

References 94 publications

Pre-treatment of biomasses using magnetised sulfonic acid catalysts

Pre-treatment of biomasses using magnetised sulfonic acid catalysts

Graded Ethanol Fractionation and Structural Characterization of Alkali-Extractable Hemicelluloses from Olea europaea L.

Hybridization Improves Inhibitor Tolerance of Xylose-fermenting Saccharomyces cerevisiae

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