Recent advances in improving lignocellulosic biomass-based bio-oil production

Dai, Leilei; Zhou, Nan; Li, Hui; Deng, Wei; Cheng, Yanling; Wang, Yunpu; Liu, Yuhuan; Cobb, Kirk; Lei, Hanwu; Chen, Paul; Ruan, Roger

doi:10.1016/j.jaap.2020.104845

Cited by 64 publications

(19 citation statements)

References 172 publications

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“…Reductive catalytic fractionation (RCF) of plant biomass is one of these methods, which includes catalytic depolymerization of lignin and isolation of cellulose [10,11]. The lignin obtained in this way contains macromolecular components with high oxygen content [12,13]. Their selective depolymerization and deoxygenation uses the catalysts based on noble metals (e.g., Au, Pd, Pt, and Ru) and less expensive but also less active transitional metals (e.g., Fe, Cu, and Ni) [14,15].…”

Section: Introductionmentioning

confidence: 99%

Reductive Catalytic Fractionation of Flax Shive over Ru/C Catalysts

et al. 2020

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Flax shive is the main waste (up to 70 wt %) in the production of flax fiber. It represents the lignified parts of the flax stem mainly in the form of small straws. Complex processing of such wastes is a significant problem due to the heterogeneity of the chemical structure of lignin. This article presents the results of reductive catalytic fractionation (RCF) of flax shive in ethanol and isopropanol at elevated temperatures (225–250 °C) in the presence of a bifunctional catalyst (Ru/C) and molecular hydrogen. This provides solvolytic depolymerization of lignin and hemicelluloses presented in flax shive. Catalytic hydrogenation effectively stabilizes the formed lignin intermediates and prevents repolymerization reactions producing the lignin fraction with a high degree of depolymerization. RCF of flax shive produces solid products with a high cellulose content and liquid products consisting mainly of monophenolic compounds. Furthermore, the effect of different characteristics (the ruthenium content, particle size, and support acidity) of the bifunctional catalysts containing ruthenium nanoparticles supported on mesoporous, graphite-like carbon material Sibunit®-4 on the yield and composition of the products of hydrogenation of flax shive in sub- and super-critical ethanol has been studied. Bifunctional catalysts Ru/C used in the RCF of flax shive increase its conversion from 44 to 56 wt % and the yield of monophenols from 1.1 to 10.2 wt % (based on the weight of lignin in the sample). Using the best Ru/C catalyst containing 3% of Ru on oxidized at 400 °C carbon support, the high degree of delignification (up to 79.0%), cellulose yield (up to 67.2 wt %), and monophenols yield (up to 9.5 wt %) have been obtained.

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Section: Introductionmentioning

confidence: 99%

Reductive Catalytic Fractionation of Flax Shive over Ru/C Catalysts

et al. 2020

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“…Since the temperature of glass transition of lignin in aqueous conditions is between 80 and 100 • C [66], relocalization of lignin occurs, improving the digestibility of cellulose as this migration promotes access to cellulose microfibrils [82]. This technique is considered a green technology as chemical reagents are not required, which also reduces the cost of the process [83]. However, increasing the severity of the process produces enzyme inhibitors [84].…”

Section: Hot Water Pretreatmentmentioning

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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“…Since bio-oil is a product of lignocellulosic thermal conversion, it constitutes a blend of phenols, aldehydes, ketones, furans, alcohols, acids, hydrocarbons, and many others depending on its feedstock [10,116]. Its production process, operating conditions, pretreatments of the feedstock [117], or later upgrading techniques [118] also determine the final composition. Table 4 summarizes typical bio-oil attributes, even though recent studies have managed to achieve better-performing traits with increased heating values and pH and lower water content and viscosity.…”

Section: General Traitsmentioning

confidence: 99%

Bio-Oil: The Next-Generation Source of Chemicals

et al. 2022

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Bio-oil, although rich in chemical species, is primarily used as fuel oil, due to its greater calorific power when compared to the biomass from which it is made. The incomplete understanding of how to explore its chemical potential as a source of value-added chemicals and, therefore, a supply of intermediary chemical species is due to the diverse composition of bio-oil. Being biomass-based, making it subject to composition changes, bio-oil is obtained via different processes, the two most common being fast pyrolysis and hydrothermal liquefaction. Different methods result in different bio-oil compositions even from the same original biomass. Understanding which biomass source and process results in a particular chemical makeup is of interest to those concerned with the refinement or direct application in chemical reactions of bio-oil. This paper presents a summary of published bio-oil production methods, origin biomass, and the resulting composition.

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Recent advances in improving lignocellulosic biomass-based bio-oil production

Cited by 64 publications

References 172 publications

Reductive Catalytic Fractionation of Flax Shive over Ru/C Catalysts

Reductive Catalytic Fractionation of Flax Shive over Ru/C Catalysts

Advances in Valorization of Lignocellulosic Biomass towards Energy Generation

Bio-Oil: The Next-Generation Source of Chemicals

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