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Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products. PubMed Scopus SCIE
期刊论文 | 2019 , 271 , 202-209 | Bioresource technology
SCOPUS Cited Count: 3
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Abstract :

This work studied the kinetic characteristics of volatile products from co-pyrolysis of microalgae and low-rank coal. Iso-conversional method was applied to calculate the reaction order, activation energy and pre-exponential factor of gaseous products (H2, CO, CH4, and CO2) and benzene. The results indicated the activation energy of H2 generating from both individual and mixing samples was the highest, meaning H2 was the hardest to generate during the pyrolysis process. The values of activation energy from the formation of CO and benzene from low-rank coal and green algae were 31.11, 32.44, 18.21 and 24.31 kJ·mol<sup>-1</sup>, respectively. The formation of benzene and CO were easier than other volatile products due to the lower activation energy. Synergistic effects were observed from the formation of CO2, the addition of green algae decreased the activation energy. The order of the activation energy was in agreement with that of the releasing sequence of main volatile products.

Keyword :

Kinetic analysis Low-rank coal Microalgae biomass Co-pyrolysis Synergistic effects

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GB/T 7714 Wu Zhiqiang , Li Yaowu , Zhang Bo et al. Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products. [J]. | Bioresource technology , 2019 , 271 : 202-209 .
MLA Wu Zhiqiang et al. "Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products." . | Bioresource technology 271 (2019) : 202-209 .
APA Wu Zhiqiang , Li Yaowu , Zhang Bo , Yang Wangcai , Yang Bolun . Co-pyrolysis behavior of microalgae biomass and low-rank coal: Kinetic analysis of the main volatile products. . | Bioresource technology , 2019 , 271 , 202-209 .
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Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries EI
期刊论文 | 2019 , 296 , 155-164 | Electrochimica Acta
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Abstract :

A Si3N4/graphene composite is designed as an interlayer for a carbon-nanotubes/sulfur cathode to improve electrochemical performance of lithium-sulfur batteries. In the interlayer, Si3N4 nanoparticles suppress the migration of the dissolved polysulfides and graphene sheets construct a 3-dimensional charge-transfer network. The carbon-nanotubes/sulfur@Si3N4/graphene cathode delivers an initial discharge capacity of 1334.7 mAh g−1 at 0.1 C and retains a capacity as high as 745.8 mAh g−1 after 200 cycles, with a capacity fade ratio of 0.22% per cycle. The cathode shows good cycling life, delivering a discharge capacity of 413.3 mAh g−1 for 1 C after 1000 cycles. According to the results of density functional theory calculation, the anchoring of the Si3N4/graphene interlayer to lithium polysulfide can be attributed to a coefficient chemical binding of Li-N and Si-S bonds generating from electronic conjugation effect between the Si3N4 supercell surface and the polysulfides. Generally, the improvement in electrochemical performance originates from the enhancements in Li+ diffusion coefficient and charge transfer, and from the restraining of the shuttle effect of the dissolved lithium polysulfide as a result of the Si3N4/graphene interlayer. © 2018 Elsevier Ltd

Keyword :

Chemical binding Conjugation effects Discharge capacities Electrochemical performance Initial discharge capacities Shuttle effect Sulfur cathodes Transfer network

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GB/T 7714 Qu, Long , Liu, Pei , Zhang, Peng et al. Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries [J]. | Electrochimica Acta , 2019 , 296 : 155-164 .
MLA Qu, Long et al. "Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries" . | Electrochimica Acta 296 (2019) : 155-164 .
APA Qu, Long , Liu, Pei , Zhang, Peng , Wang, Tao , Yi, Yikun , Yang, Pu et al. Carbon-nanotube/sulfur cathode with in-situ assembled Si3N4/graphene interlayer for high-rate and long cycling-life lithium-sulfur batteries . | Electrochimica Acta , 2019 , 296 , 155-164 .
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In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts EI
期刊论文 | 2019 , 138-151 | Journal of Catalysis
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Abstract :

To study the effect of acid-base properties of catalysts on 1,4-butanediol (BDO) dehydration to 3-buten-1-ol (BTO), Yb/Zr catalysts with different Yb content were synthesized by a wet impregnation method. The texture property, crystalline form and surface properties of the catalysts were characterized by N2 physisorption, XRD, NH3-TPD, CO2-TPD and in situ DRIFTS. The catalytic performance of BDO dehydration was also tested in a fixed-bed reactor. The experimental results showed that the activity of BDO dehydration and the selectivity of by-product tetrahydrofuran (THF) decreased with the increased Yb content, while the selectivity of the main product BTO gradually increased. The yield of BTO maximized at 64.5% when the Yb content reached 15%, which showed the best catalytic performance. Comprehensive analysis of experimental results showed that the activity of BDO dehydration and the selectivity to the by-product THF were manipulated by the acid sites of the catalysts, while BTO selectivity was tuned by both acid and basic sites of the catalysts. A higher density ratio of basic/acid sites favored the BTO formation and inhibited the formation of by-products THF. The in situ DRIFTS study of BDO dehydration over m-ZrO2 and Yb2O3 elucidated that the hydroxyl groups of BDO molecules first interacted with acid sites to form several types of butoxides. Further abstraction of β-H by basic oxygen anion could convert these butoxides into aldehyde species, which finally reacted to form BTO. The DRIFTS results were consistent with the experimental conclusions that the acid sites of the catalysts could interact with hydroxyl groups and basic sites facilitate the β-H abstraction of BDO and thereby enhancing the formation of BTO. © 2018

Keyword :

1 ,4-Butanediol Acid-base property Catalytic performance Comprehensive analysis Mechanistic studies Situ DRIFT Texture properties Wet impregnation method

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GB/T 7714 Mi, Rongli , Hu, Zhun , Yang, Bolun . In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts [J]. | Journal of Catalysis , 2019 : 138-151 .
MLA Mi, Rongli et al. "In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts" . | Journal of Catalysis (2019) : 138-151 .
APA Mi, Rongli , Hu, Zhun , Yang, Bolun . In situ DRIFTS for the mechanistic studies of 1,4-butanediol dehydration over Yb/Zr catalysts . | Journal of Catalysis , 2019 , 138-151 .
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A High-Performance Li2FeSiO4/C Cathode Enhanced by a Novel Liquid-State Carbon Source SCIE
期刊论文 | 2018 , 13 (12) , 12311-12319 | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
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Abstract :

A novel liquid-state carbon source, [2-[(2R, 3S, 4R)-3,4-dihydroxytetrahydrofuran-2-yl]-2-hydroxyethyl] dodecanoate (sorbitan monolaurat, Span-20, C18H34O6), is used to synthesize Li2FeSiO4/C by the sol-gel method. X-ray diffraction and scanning electron microscope measurements are carried out to determine the crystal structures, morphologies and particle sizes of the resulting products. The results show that Li2FeSiO4/C has pure phase and the average particle size of Li2FeSiO4 is in 20-30 nm. The result of Raman spectroscopy measurement indicates that the liquid-state carbon source can be prone to generate the carbon materials with high-ordered structure compared to the solid-state carbon source. The Li2FeSiO4/C cathode delivers an initial discharge capacity of 187 mAh g(-1) at 0.1 C rate, and it also shows good rate performance and stable cycle performance, indicating that the liquid-state carbon source helps to improve the electrochemical performance of the Li2FeSiO4/C cathode. By analyzing electrochemical impedance spectra, it is concluded that the carbon coating layer generated from the liquid-state Span-20 enhances the electrode/electrolyte interface characterization and improves the Li+ diffusion.

Keyword :

Lithium-ion battery Carbon coating Polyanion-type compound Lithium iron silicate Liquid carbon source Cathode materials

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GB/T 7714 Qu, Long , Li, Mingtao , Liu, Pei et al. A High-Performance Li2FeSiO4/C Cathode Enhanced by a Novel Liquid-State Carbon Source [J]. | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE , 2018 , 13 (12) : 12311-12319 .
MLA Qu, Long et al. "A High-Performance Li2FeSiO4/C Cathode Enhanced by a Novel Liquid-State Carbon Source" . | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE 13 . 12 (2018) : 12311-12319 .
APA Qu, Long , Li, Mingtao , Liu, Pei , Tian, Xiaolu , Yi, Yikun , Yang, Bolun . A High-Performance Li2FeSiO4/C Cathode Enhanced by a Novel Liquid-State Carbon Source . | INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE , 2018 , 13 (12) , 12311-12319 .
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Liquid-liquid-solid mass transfer and phase behavior of heterogeneous etherification of glycerol with isobutene SCIE Scopus
期刊论文 | 2018 , 64 (7) , 2526-2535 | AICHE JOURNAL
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Abstract :

Previous experiments observed auto-acceleration in the etherification of glycerol with isobutene. This article engaged to uncover the reason for this phenomenon via investigating the heterogenicity, including liquid-liquid phase equilibrium and liquid-liquid-solid mass transfer, of the reaction system. Phase behavior analysis showed that the reaction mixture separates into two liquid phases during the whole course of the reaction. The produced mono ethers of glycerol thermodynamically promote the homogenization of the two liquid phases. The modeling results of liquid-liquid-solid mass transfer indicated that the resistance of mass transfer is insignificant during the reaction. The bulk compositions of the two liquid phases are very close to their corresponding equilibrium compositions. An increase of isobutene concentration in the reaction phase is believed to lead all reactions speeding up. (c) 2018 American Institute of Chemical Engineers AIChE J, 64: 2526-2535, 2018

Keyword :

isobutene auto-accelerated reaction glycerol ether mass transfer liquid-liquid equilibrium

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GB/T 7714 Liu, Jingjun , Yang, Bolun . Liquid-liquid-solid mass transfer and phase behavior of heterogeneous etherification of glycerol with isobutene [J]. | AICHE JOURNAL , 2018 , 64 (7) : 2526-2535 .
MLA Liu, Jingjun et al. "Liquid-liquid-solid mass transfer and phase behavior of heterogeneous etherification of glycerol with isobutene" . | AICHE JOURNAL 64 . 7 (2018) : 2526-2535 .
APA Liu, Jingjun , Yang, Bolun . Liquid-liquid-solid mass transfer and phase behavior of heterogeneous etherification of glycerol with isobutene . | AICHE JOURNAL , 2018 , 64 (7) , 2526-2535 .
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Multi-scale CFD simulations of bubbling fluidized bed methanation process EI Scopus
期刊论文 | 2018 | Chemical Engineering Journal
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Abstract :

The two-fluid model coupled with the improved local-structure-dependent drag model and the modified chemical kinetics is employed to account for the multi-scale phenomenon in a bubbling fluidized bed methanation process for the production of synthetic natural gas. The accuracy of this multi-scale CFD model is verified by a series of experimental data under different operating temperatures, inlet compositions, inlet velocities and initial bed heights. The cold flow CFD simulations are further carried out to evaluate the effects of the chemical reactions on the meso-scale structure. The results demonstrate that the bubble volume fraction and bubble velocity decreases due to the gas volume contraction caused by the methanation reactions. Three-region distribution of the gas temperature is obtained by simultaneously solving the multi-scale CFD model and the energy equations and the simulation results are compared with those based on the isothermal flow assumption. The results indicate that the distributions of solid volume fraction and mole fractions obtained based on the isothermal flow assumption are almost coincident with those obtained by solving the energy equations, which confirms the rationality of the isothermal flow assumption in a fluidized bed reactor. © 2018 Elsevier B.V.

Keyword :

Bubbling fluidized bed CFD simulations Fluidized bed reactors Mesoscale structure Multi-scale Operating temperature Solid volume fraction Synthetic natural gas

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GB/T 7714 Li, Jiageng , Yang, Bolun . Multi-scale CFD simulations of bubbling fluidized bed methanation process [J]. | Chemical Engineering Journal , 2018 .
MLA Li, Jiageng et al. "Multi-scale CFD simulations of bubbling fluidized bed methanation process" . | Chemical Engineering Journal (2018) .
APA Li, Jiageng , Yang, Bolun . Multi-scale CFD simulations of bubbling fluidized bed methanation process . | Chemical Engineering Journal , 2018 .
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Kinetic analysis on gaseous products during co-pyrolysis of low-rank coal with lignocellulosic biomass model compound: Effect of lignin EI
会议论文 | 2018 , 152 , 916-921 | 2018 Applied Energy Symposium and Forum, Carbon Capture, Utilization and Storage, CCUS 2018
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Abstract :

Co-pyrolysis of coal and lignocellulosic biomass can reduce the consumption of non-renewable fossil fuel and improve the proportion of renewable energy. Products distribution and kinetic analysis can provide fundamental information about the process design and facility development. In this paper, kinetic analysis on the main gaseous products during co-pyrolysis of low-rank coal with lignocellulosic biomass model compound was explored via a drop tube furnace combined with process mass spectrometer. Lignin was selected as the typical model compound, which is also the main content of black liquor from the paper industry. Releasing properties of the main volatile products from individual and mixing materials under various lignin mixing ratios were obtained. Iso-conversional method was applied to calculate the kinetic parameters, including reaction order, frequency factor, and activation energy. The activation energy about forming of CO2, CO, CH4, and H2 from low-rank coal was 40.23 kJ/mol, 20.39 kJ/mol, 48.39 kJ/mol and 37.37 kJ/mol. The frequency factor were 1.48, 0.12, 6.43 and 0.43 respectively. The activation energy about forming of CO2, CO, CH4, and H2 from lignin was 15.42 kJ/mol, 32.28 kJ/mol, 12.94 kJ/mol and 35.21 kJ/mol. Copyright © 2018 Elsevier Ltd. All rights reserved.

Keyword :

Copyrolysis Drop tube furnaces Iso-conversional method Kinetic analysis Lignocellulosic biomass Low rank coals Products distributions Renewable energies

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GB/T 7714 Fan, Yingjie , Li, Yaowu , Wu, Zhiqiang et al. Kinetic analysis on gaseous products during co-pyrolysis of low-rank coal with lignocellulosic biomass model compound: Effect of lignin [C] . 2018 : 916-921 .
MLA Fan, Yingjie et al. "Kinetic analysis on gaseous products during co-pyrolysis of low-rank coal with lignocellulosic biomass model compound: Effect of lignin" . (2018) : 916-921 .
APA Fan, Yingjie , Li, Yaowu , Wu, Zhiqiang , Sun, Zongyu , Yang, Bolun . Kinetic analysis on gaseous products during co-pyrolysis of low-rank coal with lignocellulosic biomass model compound: Effect of lignin . (2018) : 916-921 .
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Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory EI CPCI-S SCIE Scopus
会议论文 | 2018 , 314 , 170-178 | 17th Congress of Asia-Pacific-Confederation-of-Chemical-Engineering (APCChE)
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Abstract :

Hydrodesulfurization (HDS) of thiophenic sulfur with hindered groups in the presence of inhibitors (nitrogen compounds and H2S) is vital in achieving ultralow sulfur level in gasoline. The objective of this research was to investigate effects of inhibitors and hindered groups on ultra-deep HDS of thiophenic sulfur on Ni2P catalyst in a mechanistic perspective. Density functional calculations were used to investigate adsorption of inhibitors and sulfur compounds combined with thermodynamic analysis. Activation mechanism of sulfur compounds was studied using partial density of state (PDOS) and electron density difference analysis. All species preferred to be adsorbed at the three-fold hollow Ni site and its vicinity. Inhibitors had larger adsorption energy and constant than sulfur compounds. Co-adsorption of thiophene and inhibitors weakened the adsorption of thiophene. Population analysis revealed that some electrons moved to higher energy states suggesting activation. Sulfur compounds adsorbed to Ni2P surface mainly through Ni-S bonds exhibiting characteristics of covalent bonding, originating from the overlapping of 3p states of S and 3d states of Ni. Inhibitors show tendencies to adsorb to Ni2P surface over sulfur compounds. Hindered groups impede adsorption of sulfur compounds and weaken the interaction between sulfur compounds and surface mainly due to steric hinderance.

Keyword :

Thermodynamics Inhibitor Ultra-deep hydrodesulfurization Hindered group Density functional theory

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GB/T 7714 Zhang, Peng , Zhao, Qichen , Liu, Jingjun et al. Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory [C] . 2018 : 170-178 .
MLA Zhang, Peng et al. "Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory" . (2018) : 170-178 .
APA Zhang, Peng , Zhao, Qichen , Liu, Jingjun , Yang, Bolun . Research on inhibitors and hindered groups in ultra-deep hydrodesulfurization based on density functional theory . (2018) : 170-178 .
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Functional groups in geminal imidazolium ionic compounds and their influence on thermo-physical properties EI Scopus SCIE
期刊论文 | 2018 , 269 , 738-745 | Journal of Molecular Liquids
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Abstract :

To enhance the thermal stability of ionic liquids (ILs) and increase the latent heat, the effect of functional groups for geminal dicationic ionic compounds were investigated and compared to that of monocationic ionic liquids (MILs) analogues. A series of new functionalized ionic compounds were synthesized by introducing vinyl group, cyanomethyl group, hydroxyl group, and carboxyl group to the imidazolium cation. The structures of these ionic compounds were confirmed by 1H NMR, 13C NMR and FT-IR. The thermal stability was determined by TGA; the melting temperature, heat of fusion and heat capacity were investigated by DSC for the synthetic ionic compounds. The thermal analysis results indicate that the functionalized ionic compounds show excellent thermal stability. The decomposition temperature and melting temperature can be up to 593.17 K and 484.99 K, respectively, and the latent heat can reach 64.40 KJ·mol−1. It's increased on average by 6.30%, 34.0% and 93.93%, respectively, as compared to alkyl chain ionic liquid (C2mim)Br. In addition, the heat capacity and thermal storage density of the functionalized ionic compounds are higher than those of the MILs. These superior properties are attributed to the additional hydrogen bonds and electrostatic energy in the functionalized ionic compounds. © 2018 Elsevier B.V.

Keyword :

Carboxyl groups Decomposition temperature Electrostatic energies Heat of fusion Imidazolium cation Ionic compounds Ionic liquid (ils) Thermo-physical property

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GB/T 7714 Zhang, Hang , Liu, Jingru , Li, Mingtao et al. Functional groups in geminal imidazolium ionic compounds and their influence on thermo-physical properties [J]. | Journal of Molecular Liquids , 2018 , 269 : 738-745 .
MLA Zhang, Hang et al. "Functional groups in geminal imidazolium ionic compounds and their influence on thermo-physical properties" . | Journal of Molecular Liquids 269 (2018) : 738-745 .
APA Zhang, Hang , Liu, Jingru , Li, Mingtao , Yang, Bolun . Functional groups in geminal imidazolium ionic compounds and their influence on thermo-physical properties . | Journal of Molecular Liquids , 2018 , 269 , 738-745 .
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On-line analysis on fast pyrolysis of lignocellulosic biomass: Thermal behavior and kinetic analysis of hemicellulose EI
会议论文 | 2018 , 152 , 1290-1295 | 2018 Applied Energy Symposium and Forum, Carbon Capture, Utilization and Storage, CCUS 2018
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Abstract :

Thermal conversion of lignocellulosic biomass can provide various products for the energy demand of low carbon city. Pyrolysis is the initial step of other thermochemical method, which is also a potential technology for biomass conversion. Previous research mainly focuses on the thermal behavior of the whole component in lignocellulosic biomass during pyrolysis. The organic component has a significant influence on the products distribution and kinetic characteristic. Thus, in this research hemicellulose (HCE) was selected as one of the typical organic components in biomass. Products distribution and characteristic of gas were explored by a tube furnace and an on-line mass spectrometer from 650oC to 850oC. Iso-conversional method was applied to obtain the kinetic parameters of gaseous products (H2、CO、CH4 and CO2) from HCE. The results indicated that gas and tar were the main products from fast pyrolysis of HCE. The yield of gas increased from 26.65 wt.% to 44.63 wt.% as the increase of temperature. CO and CO2 were the main content of gaseous, which accounted about 80 % the gas. The volume of H2 increased from 5.28 vol.% to 15.82 vol.% when temperature increased from 650oC to 850oC. The high heating value of the gaseous products was between 10.95 and 12.52 MJ·Nm-3. Releasing properties of the main volatile products from HCE were also obtained, and the intensity of gaseous was similar with the yield changing. The activation energy for CO2, CO, CH4, and H2 were 22.35 kJ·mol-1, 36.13 kJ·mol-1, 26.65 kJ·mol-1, 21.66 kJ·mol-1. The pre-exponential of H2, CO, CH4 and CO2 was 0.3436 s-1, 1.5898 s-1, 1.0298 s-1, 0.4937 s-1, respectively. Copyright © 2018 Elsevier Ltd. All rights reserved.

Keyword :

Iso-conversional method Kinetic analysis Kinetic characteristics Lignocellulosic biomass Potential technologies Products distributions Thermal behaviors Typical organic component

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GB/T 7714 Wu, Zhiqiang , Li, Yaowu , Meng, Haiyu et al. On-line analysis on fast pyrolysis of lignocellulosic biomass: Thermal behavior and kinetic analysis of hemicellulose [C] . 2018 : 1290-1295 .
MLA Wu, Zhiqiang et al. "On-line analysis on fast pyrolysis of lignocellulosic biomass: Thermal behavior and kinetic analysis of hemicellulose" . (2018) : 1290-1295 .
APA Wu, Zhiqiang , Li, Yaowu , Meng, Haiyu , Yang, Wangcai , Yang, Bolun . On-line analysis on fast pyrolysis of lignocellulosic biomass: Thermal behavior and kinetic analysis of hemicellulose . (2018) : 1290-1295 .
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