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lignocellulose aerogel and amorphous silica nanoparticles from rice husks

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Journal of Leather Science and Engineering 2021年第1期3卷 11-17页

作者： Zichao Wei Andrew T.Smith William R.T.Tait Jingjing Liu Hao Ding Hui Wang Weixing Wang Luyi Sun Polymer Program Institute of Materials ScienceUniversity of ConnecticutStorrsCT 06269USA Department of Chemical&Biomolecular Engineering University of ConnecticutStorrsCT 06269USA College of Materials Science and Engineering South China University of TechnologyGuangzhou 510640GuangdongChina Key Laboratory of Enhanced Heat Transfer and Energy Conservation of the Ministry of Education School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640GuangdongChina Department of Biomedical Engineering University of ConnecticutStorrsCT 06269USA

Rice Husks(RHs)are one of the most abundant sources of biomass in the world due to rice *** and silica are two of the main components of RHs,which allow RHs to be applied in different *** can be partially dissolved in 1-butyl-3-methylimidazolium chloride(BMIMCl),which is a simple way of competing with the traditional extraction methods that suffer from high chemical consumption.A lignocellulose freeze gel is obtained via a cyclic liquid nitrogen freeze-thaw(NFT)***-functional self-assembled lignocellulose aerogel is obtained after CO_(2) supercritical *** on the aerogel’s special properties,two routes are developed for practical *** one hand,the aerogel is coated to exhibit a superhydrophobic property that can be applied as an absorbent for oil *** the other hand,a carbon aerogel is synthesized via a pyrolysis process,resulting in a porous amorphous *** residue after partially dissolving lignocellulose in BMIMCl is further calcined to obtain amorphous silica nanoparticles,achieving a comprehensive application of RHs.

关键词： Rice husks lignocellulose Carbon aerogel Silica

A sustainable process to 100%bio-based nylons integrated chemical and biological conversion of lignocellulose

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Green Energy & Environment 2024年第2期9卷 390-402页

作者： Ruijia Hu Ming Li Tao Shen Xin Wang Zhuohua Sun Xinning Bao Kequan Chen Kai Guo Lei Ji Hanjie Ying Pingkai Ouyang Chenjie Zhu College of Biotechnology and Pharmaceutical Engineering Nanjing Tech UniversityNanjingChina National Engineering Research Center for Biotechnology Nanjing Tech UniversityNanjingChina Beijing Key Laboratory of Lignocellulosic Chemistry Beijing Forestry UniversityBeijingChina

Considerable progress has been made in recent years to the development of sustainable polymers from bio-based *** this study,100%bio-based nylons were prepared via an integrated chemical and biological process from *** novel nylons were obtained by the melt polymerization of 3-propyladipic acid derived from lignin and 1,5-pentenediamine/1,4-butanediamine derived from carbohydrate *** to the concept is a three-step noble metal free catalytic chemical funnelling sequence(Raney Ni mediated reductive catalytic fractionation-reductive funnelling-oxidative funnelling),which allowed for obtaining a single component 3-propyladipic acid from lignin with high *** structural and thermodynamic properties of the obtained nylons have been systematically investigated,and thus obtained transparent bio-based nylons exhibited higher Mw(>32,000)and excellent thermal stability(Td5%>265℃).Considering their moderate Tg and good melt strength,these transparent bio-based nylons could serve as promising functional additives or temperature-responsive materials.

关键词： lignocellulose Lignin Reductive catalytic fractionation Bio-based nylon

Co@CoO:An efficient catalyst for the depolymerization and upgrading of lignocellulose to alkylcyclohexanols with cellulose intact

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Journal of Energy Chemistry 2023年第2期77卷 191-199,I0006页

作者： Shuang Xiang Lin Dong Zhiqiang Wang Xue Han Yong Guo Xiaohui Liu Xue-Qing Gong Yanqin Wang Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research CenterResearch Institute of Industrial CatalysisSchool of Chemistry and Molecular EngineeringEast China University of Science and TechnologyShanghai 200237China Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources International Innovation Center for Forest Chemicals and MaterialsJiangsu Province Key Laboratory of Green Biomass-based Fuels and ChemicalsCollege of Chemical EngineeringNanjing Forestry UniversityNanjing 210037JiangsuChina Department of Chemistry University of ManchesterManchester M139PLUK

The depolymerization and upgrading of lignin from raw biomass,while keeping cellulose intact is important in biorefinery and various metal-based catalysts have been used in reductive catalytic fractionation,a key method in"lignin-first"strategy,Recently,we found that a core-shell structured Co@CoO catalyst with CoO shell as the real active site had excellent performance in the hydrogenolysis of 5-hydromethylfurfural to 2,5-dimethylfuran due to its unique ability to dissociate H_(2)and yield active H^(δ-)species(Xiang et al.,2022).In this work,we report a one-pot depolymerization and upgrading of lignocellulose to alkylcyclohexanols,a flavour precursor,with intact cellulose over this unique core-shell structured catalyst,Co@*** model compounds(β-O-4,4-O-5,α-O-4)were first used to clarify the activity of Co@CoO ***,the one-pot conversion of various organosolv lignin(birch,pine and poplar)to alkylcyclohexanols was realized with the mass yield of alkylcyclohexanols up to25.8 wt%from birch lignin under the reaction condition of 210℃,1 MPa H_(2),16 ***,the corresponding woody sawdusts were used as feedstocks and found that the Co@CoO catalyst indeed preferentially depolymerized and upgraded the lignin part and obtained the same alkylcyclohexanols products with the retention of cellulose-rich *** collected alkylcyclohexanols were further esterified to obtain valueadded esters,which can be used as *** work will inspire the design of new efficient metal oxide catalysts in lignin fractionation and depolymerization to high-value-added chemicals with intact cellulose.

关键词： lignocellulose Lignin Depolymerization Co@CoO Alkylcyclohexanols

Establishment and verification of a shrinking core model for dilute acid hydrolysis of lignocellulose

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Frontiers in Energy 2012年第4期6卷 413-419页

作者： Cunwen WANG Xiaoling DUAN Weiguo WANG Zihao LI Yuanhang QIN Key Laboratory for Green Chemical Process of Ministry of Education Wuhan Institute of TechnologyWuhan 430074China

The kinetics oflignocellulose hydrolysis under the conditions of high temperature and dilute acid （mass fraction 0.05%） was investigated in this paper. By studying the reducing sugar concentration versus reaction tempera ture （170℃-220℃） and reaction time （150-1800 s） during the hydrolysis process of five kinds of crop straw （rice, wheat, cotton, rape and corn）, the shrinking core model was established, and the differential equation of the model and its analytical solution were obtained. With a numerical calculation method, the kinetic equation was estimated, and the degradation of reducing sugar obeyed firstorder kinetics was obtained. The calculated results from the equations agreed well with the original experimental data. The calculation by the model showed that the reducing sugar concentration increases as the size of the particles decrease, and the uniform particles increase.

关键词： lignocellulose dilute acid hydrolysis shrink-ing core model

Ionic liquids: Efficient solvent and medium for the transformation of renewable lignocellulose

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Science China Chemistry 2012年第8期55卷 1500-1508页

作者： LONG JinXing LI XueHui WANG LeFu ZHANG Ning State Key Laboratory of Pulp&Paper Engineering School of Chemistry and Chemical EngineeringSouth China University of TechnologyGuangzhou 510640China Department of Chemistry Nanchang UniversityNanchang 330047China

Carbon-enriched lignocelluloses are regarded as the perfect alternative for nonrenewable fossil fuel, and have a great potential to alleviate the increasing energy crisis and climate change. However, the tightly covalent structure and strong intra and in- ter-molecular hydrogen bonding in lignoceUulose make it high recalcitrance to transformation due to the poor solubility in wa- ter or common organic solvents. Dissolution and transformation of lignocellulose and its constituents in ionic liquids have therefore attracted much attention recently due to the tunable physical-chemical properties. Here, ionic liquids with excellent dissolving capability for biomass and its ingredients were examined. The technologies for lignocellulose biorefining in the presence of ionic liquid solvents or catalysts were also summarized. Some pertinent suggestions for the future catalytic conver- sion and unitization of this sustained carbon-rich resource are proposed.

关键词： ionic liquids lignocellulose dissolution biorefinery

Processing and valorization of cellulose,lignin and lignocellulose using ionic liquids

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Journal of Bioresources and Bioproducts 2020年第2期5卷 79-95页

作者： Zhenghao Xia Jinyang Li Jinming Zhang Xiaocheng Zhang Xuejing Zheng Jun Zhang Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Engineering PlasticsInstitute of ChemistryChinese Academy of Sciences(CAS)Beijing 100190China University of Chinese Academy of Sciences Beijing 100049China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou 450001China

Cellulose,lignin and lignocellulose are important bioresources in the *** effective and environmentally friendly utilization not only reduces dependence on fossil resources but also protects the ***,a class of novel eco-friendly solvents,ionic liquids,is employed to dissolve and process these *** this mini-review,we summarized the recent advances of processing and valorization of cellulose,lignin and lignocellulose in ionic *** is expected that this up-to-date survey provides a comprehensive information of this field,and accelerates the development and utilization of the renewable plant biomass resources.

关键词： lignocellulose Cellulose Lignin High-performance material Ionic liquid

Integrated engineering of enzymes and microorganisms for improving the efficiency of industrial lignocellulose deconstruction

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Engineering Microbiology 2021年第1期1卷 11-20页

作者： Guodong Liu Yinbo Qu State Key Laboratory of Microbial Technology Shandong UniversityQingdao 266237China National Glycoengineering Research Center Shandong UniversityQingdao 266237China

Bioconversion of lignocellulosic biomass to fuels and chemicals represents a new manufacturing paradigm that can help address society’s energy,resource,and environmental ***,the low efficiency and high cost of lignocellulolytic enzymes currently used hinder their use in the industrial deconstruction of *** overcome these challenges,research efforts have focused on engineering the properties,synergy,and production of lignocellulolytic ***,lignocellulolytic enzymes’catalytic efficiency,stability,and toler-ance to inhibitory compounds have been improved through enzyme mining and ***,synergistic actions between different enzyme components have been strengthened to construct customized enzyme cocktails for the degradation of specific lignocellulosic ***,biological processes for protein synthesis and cell morphogenesis in microorganisms have been engineered to achieve a high level and low-cost production of lignocellulolytic *** this review,the relevant progresses and challenges in these fields are *** engineering is proposed to be essential to achieve cost-effective enzymatic deconstruction of lignocellulose in the future.

关键词： lignocellulose Cellulase Hemicellulase Fungi Genetic engineering Biorefinery

Advances in catalytic conversion of lignocellulose to chemicals and liquid fuels

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Journal of Energy Chemistry 2019年第9期28卷 74-86页

作者： Jiping Ma Song Shi Xiuquan Jia Fei Xia Hong Ma Jin Gao Jie Xu State Key Laboratory of Catalysis Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023 Liaoning China University of the Chinese Academy of Sciences Beijing 100049 China

In response to the awareness of limited fossil resources and environmental concerns,catalytic conversion of renewable lignocellulose biomass to value-added chemicals and fuels is of great significance and attractive for sustainable *** of Biomass Conversion and Bio-Energy attached to Dalian National Laboratory for Clean Energy has devoted themselves to valorization of lignocellulose biomass since launched in *** research interests focus on breeding of biomass resources(inulin and microalgae),exploration of catalytic and biological technologies,and production of energy chemicals and *** lignocellulose biomass is renewable and abundant,the way of utilization should be reasonable according to its structural characteristics in view of efficiency and *** this review,to celebrate the DICP's 70 th anniversary,we will highlight the major fundamental advances in DICP about the conversion of lignocellulose to value-added chemicals and liquid *** attention will be paid to the transformation of cellulose and its derivatives to glycols,acids and nitrogen-containing chemicals,hemicellulose-derived platform molecule furfural to jet fuels and lignin to aromatics using catalytic technologies.

关键词： Catalysis lignocellulose Gycols Furan derivatives Aromatics

Dynamic Changes of Microbial Community for Degradation of lignocellulose

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Journal of Northeast Agricultural University(English Edition) 2010年第4期17卷 60-65页

作者： LI Wenzhe LIU Shuang WANG Chunying ZHENG Guoxiang Engineering College Northeast Agricultural University Harbin 150030 China

Dynamic changes of a microbial community for lignocellulose degradation were explored in details. Community composition and development were investigated by the means of denaturing gradient gel electrophoresis （DGGE）, and results showed that the microbial community was constituted of 14 kinds of bacteria and presented the fluctuation in some degrees with fermentation. Furthmore, the result of cluster analysis of DGGE pattern was accordant with growth curve, and the degradation process was divided into three stages： initial stage （0-12 h）, intermediate stage （24-144 h） and end stage （144-216 h）.

关键词： lignocellulose microbial community dynamic change