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Coupling biomass pretreatment for enzymatic hydrolysis and direct biomass-to-electricity conversion with molybdovanadophosphoric heteropolyacids as anode electron transfer carriers

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Journal of Energy Chemistry 2021年第7期30卷 133-146页

作者： Huishan Yang Yuchen Bai Denghao Ouyang Fangqian Wang Dehua Liu Xuebing Zhao Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084China Institute of Applied Chemistry Department of Chemical EngineeringTsinghua UniversityBeijing 100084China

Owing to their acidity,oxidizing ability and redox reversibility,molybdovanadophosphoric heteropolyacids(H_(n+3)PMo_(12-n)VnO40,abbreviated as PMo_(12-n)Vn) were employed as electron transfer carriers for coupling biomass pretreatment for enzymatic hydrolysis and direct biomass-to-electricity *** this novel coupled process,PMo_(12-n)Vn pretreatment that causes deconstruction of cell wall structure with PMo_(12-n)Vn being simultaneously reduced can be considered as the "charging" *** reduced PMo_(12-n)Vn are further re-oxidized with release of electrons in a liquid flow fuel cell(LFFC) to generate electricity is the "discharging" *** Keggin-type PMo_(12-n)Vn with different degree of vanadium substitution(DSV, namely n) were *** to Keggin-type phosphomolybdic acid(PMo_(12)),PMo_(12-n)Vn(n=1-6) showed higher oxidizing ability but poorer redox *** cellulose enzymatic digestibility of PMo_(12-n)Vn pretreated wheat straw generally decreased with increase in DSV, but xylan enzymatic digestibility generally increased with ***_(12) pretreatment of wheat straw at 120℃ obtained the highest enzymatic glucan conversion(EGC) reaching 95%,followed by PMo11V1 pretreatment(85%).Discharging of the reduced heteropolyacids in LFFC showed that vanadium substitution could improve the maximum output power density(Pmax).The highest Pmax was obtained by PMo9 V3(44.7 mW/cm^(2)) when FeCl_(3) was used as a cathode electron carrier,while PMo_(12) achieved the lowest Pmax(27.4 mW/cm^(2)).All the heteropolyacids showed good electrode Faraday efficiency(>95%) and cell discharging efficiency(>93%).The energy efficiency of the coupled process based on the heat values of the products and generated electric energy was in the range of 18%-25% depending on ***_(12) and PMo11V1 seem to be the most suitable heteropolyacids to mediate the coupled process.

关键词： Molybdovanadophosphoric heteropolyacid Electron transfer carrier biomass pretreatment Enzymatic hydrolysis Direct biomass fuel cell Electricity generation

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CAOSA-extracted lignin improves enzymatic hydrolysis of cellulose

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Green Energy & Environment 2024年第7期9卷 1101-1111页

作者： Sen Ma Zheng Li Jonathan Sperry Xing Tang Yong Sun Lu Lin Jian Liu Xianhai Zeng College of Energy State Key Laboratory of Physical Chemistry of Solid SurfacesXiamen UniversityXiamen361102China Fujian Engineering and Research Centre of Clean and High-valued Technologies for biomass Xiamen Key Laboratory of Clean and High-valued Utilization of BiomassXiamen361102China Centre for Green Chemical Science University of AucklandAuckland1142New Zealand

The conversion of biomass into sugar platform compounds is very important for the biorefinery *** is essential to the biomass of the sugar platform,however,the lignin obtained by pretreatment,as a key part of lignocellulose,generally has a passive effect on the enzymatic hydrolysis of cellulose into *** this study,p-TsOH(p-toluenesulfonic acid),DES(Deep eutectic solvent)and CAOSA(cooking with active oxygen and solid alkali)pretreatment ways were used to fraction lignin from bamboo *** CAOSA treatment,the hydrolysis efficiency of the pulp was 95.57%.Moreover,the effect of different treatment methods on lignin properties was studied and the promotion effect of lignin was investigated by adding it to the cellulose enzymatic hydrolysis *** this work,the results showed that CAOSA-extracted lignin with lower D(1.31-1.25)had a better adsorption effect on the enzyme protein.p-TsOH-extracted lignin with a larger S/G ratio enhanced the inhibition of enzymatic *** addition,the presence of-COOHs in lignin could reduce its inhibitory effect on cellulose saccharification.

关键词： biomass pretreatment CAOSA Cellulose hydrolysis Lignin Enzyme

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Review of Cellulose Smart Material: biomass Conversion Process and Progress on Cellulose-Based Electroactive Paper

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Journal of Renewable Materials 2018年第1期6卷 1-25页

作者： S.H.Hassan Lee Hwei Voon T.S.Velayutham Lindong Zhai Hyun Chan Kim Jaehwan Kim Nanotechnology and Catalysis Research Center(NanoCat) Institute of Postgraduate StudiesUniversity of Malaya50603 Kuala LumpurMalaysia Low Dimensional Materials Research Center Department of PhysicsFaculty of ScienceUniversity of Malaya50603 Kuala LumpurMalaysia Department of Mechanical Engineering Inha UniversityIncheon 22212South Korea

Cellulose is a renewable biomass material and natural polymer which is abundantly available on Earth,and includes agricultural wastes,forestry residues,and woody *** excellent and smart characteristics of cellulose materials,such as lightweight,biocompatibility,biodegradability,high mechanical strength/stiffness and low thermal expansibility,have made cellulose a highpotential material for various industry *** has recently been discovered as a smart material in the electroactive polymers family which carries the name of cellulose-based electroactive paper(EAPap).The shear piezoelectricity in cellulose polymers is able to induce large displacement output,low actuation voltage,and low power consumption in the application of biomimetic sensors/actuators and electromechanical *** present study provides an overview of biomass pretreatment from various lignocellulosic cellulose(LC)resources and nanocellulose production via TEMPO-mediated oxidation reaction,followed by the production of different types of EAPap versus its performance,and lastly the applications of EAPap in different areas and ***,LC biomass consists mainly of cellulose having a small content of hemicelluloses and lignins which form a defensive inner structure against the degradation of plant cell ***,selective approaches are discussed to ensure proper extraction of cellulosic fibers from complex biomass for further minimization to *** addition,a comprehensive review of the development of cellulose-based EAPap as well as fabrication,characterization,performance enhancement and applications of EAPap devices are discussed herein.

关键词： biomass pretreatment nanocellulose renewable materials smart materials actuators

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Propyl-Sulfonic Acid Functionalized Nanoparticles as Catalyst for pretreatment of Corn Stover

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Journal of Biomaterials and Nanobiotechnology 2014年第1期5卷 8-16页

作者： Leidy Pena Feng Xu Keith L.Hohn Jun Li Donghai Wang Department of Biological and Agricultural Engineering Kansas State UniversityManhattanUSA Department of Chemical Engineering Kansas State UniversityManhattanUSA Department of Chemistry Kansas State UniversityManhattanUSA

Propyl-sulfonic (PS) acid-functionalized nanoparticles were synthesized, characterized and evaluated as catalysts for pretreatment of corn stover. Silica coated nanoparticles were functionalized with 0.5% mercaptopropyltrimethoxysilane (MPTMS) at neutral pH in a mixture of water and ethanol. Sulfur contents of the acid functionalized nanoparticles, measured in a CHNS analyzer, varied from 6%-10%, and the acid load ranged from 0.040 to 0.066 mmol H+/g. A Box-Behnken design was employed to calculate the minimum number experiments required to obtain an estimate of the surface response for temperature, catalyst load, and %S content of the catalyst. pretreatment of corn stover was carried out at three temperature levels 160, 180, and 200°C for 1 h. Three levels of catalyst load were used 0.1, 0.2, and 0.3 g of catalyst per gram of biomass. Hydro-thermolysis controls were carried at each temperature level. The catalyst load did not have an effect on the glucose yield at 160°C, and the average glucose yield obtained at this temperature was 59.0%. The glucose yield was linearly correlated to the catalyst load during pretreatment at 180°C, and a maximum glucose yield of 90% was reached when using 0.2 g of PS nanoparticles that had a total sulfur content of 6.1%. Complete hydrolysis of glucose was reached at 200°C but the average xylose yield was 4.6%, and about 20.2% of the combined glucose and xylose were lost as hydroxymethylfurfural and furfural. Results showed that acid-functionalized nanoparticles can be potential catalysts for the pretreatment of biomass for its later conversion to ethanol.

关键词： Acid Functionalized Nanoparticles Catalyst biomass pretreatment Hydrolysis

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