5 results
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2. Pretreatment of Eucalyptus in biphasic system for furfural production and accelerated enzymatic hydrolysis.
- Author
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Zhang X, Bai Y, Cao X, and Sun R
- Subjects
- Lignin, Xylose, Eucalyptus, Furaldehyde, Hydrolysis
- Abstract
Herein, an efficient biphasic pretreatment process was developed to improve the production of furfural (FF) and glucose from Eucalyptus. The influence of formic acid and NaCl on FF production from xylose in water and various biphasic systems was investigated. Results showed that the addition of formic acid and NaCl significantly promoted the FF yield, and the biphasic system of MIBK (methyl isobutyl ketone)/water exhibited the best performance for FF production. Then the Eucalyptus was pretreated in the MIBK/water system, and a maximum FF yield of 82.0% was achieved at 180°C for 60min. Surface of the pretreated Eucalyptus became relatively rough and loose, and its crystallinity index increased obviously due to the removal of hemicelluloses and lignin. The pretreated Eucalyptus samples showed much higher enzymatic hydrolysis rates (26.2-70.7%) than the raw Eucalyptus (14.5%)., (Copyright © 2017 Elsevier Ltd. All rights reserved.)
- Published
- 2017
- Full Text
- View/download PDF
3. A comparison of the autohydrolysis and ammonia fiber explosion (AFEX) pretreatments on the subsequent enzymatic hydrolysis of coastal Bermuda grass.
- Author
-
Lee JM, Jameel H, and Venditti RA
- Subjects
- Ammonia chemistry, Biotechnology methods, Crystallization, Ethanol chemistry, Fermentation, Microscopy, Electron, Scanning methods, Polysaccharides chemistry, Spectroscopy, Fourier Transform Infrared methods, Surface Properties, Temperature, Time Factors, X-Ray Diffraction methods, Cynodon metabolism, Hydrolysis
- Abstract
Two distinct pretreatment technologies, autohydrolysis and AFEX, have been applied to coastal Bermuda grass (CBG) followed by enzymatic hydrolysis in order to compare the effects of pretreatment on the subsequent sugar generation. Furthermore, the influence of structural features from each pretreatment on biomass digestibility was characterized with SEM, ATR-FTIR, and XRD. Enzymatic conversion of pretreated solids from the pretreatments increased with elevated temperature and longer residence times. AFEX pretreatment at 100 degrees C for 30 min produced a sugar yield of 94.8% of theoretical possible with 30 FPU/g enzymatic loading, the maximum achieved with AFEX. It was also shown that with autohydrolysis at 170 degrees C for 60 min that 55.4% sugar yield of the theoretical possible was produced with a 30 FPU/g enzymatic loading, the maximum with autohydrolysis. AFEX pretreatment does not change the chemical composition of CBG but autohydrolysis reduces hemicellulose content in the pretreated solids. Both pretreatments cause re-localization of lignin components. There was no observed correlation between crystallinity and enzyme digestibility of the pretreated solids. AFEX pretreatment developed more enzymatic accessibility to pretreated solids of CBG than did autohydrolysis pretreatment, leading to more sugar generation through the whole process. The total amount of sugars accounted for with autohydrolysis decreases with increasing temperature, consistent with increased byproduct generation via thermal degradation reactions., (Published by Elsevier Ltd.)
- Published
- 2010
- Full Text
- View/download PDF
4. Modifying woody plants for efficient conversion to liquid and gaseous fuels
- Author
-
Malcolm, E [Institute of Paper Science and Technology, Atlanta, GA (USA)]
- Published
- 1990
- Full Text
- View/download PDF
5. Autonomous hydrogen production for proton exchange membrane fuel cells PEMFC
- Author
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Manuel Legree, Jean-Louis Bobet, Fabrice Mauvy, F. Bos, Matthieu Faessel, Jocelyn Sabatier, Abdel Salam Awad, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), Université de Bordeaux (UB)-Institut Polytechnique de Bordeaux-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Chimie Physique des Matériaux (LCPM), Université Libanaise, Laboratoire de l'intégration, du matériau au système (IMS), Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS), Université de Bordeaux (UB), and The authors acknowledge the AST society, the Aquitaine SATT, for the funding of the prototype presented in this paper in the form of the HELP maturation project.
- Subjects
command law ,Materials science ,Hydrogen ,Magnesium ,020209 energy ,Proton exchange membrane fuel cell ,chemistry.chemical_element ,02 engineering and technology ,[CHIM.MATE]Chemical Sciences/Material chemistry ,021001 nanoscience & nanotechnology ,Hydrogen generation ,7. Clean energy ,hydrolysis reaction ,Hydrolysis ,chemistry ,Chemical engineering ,Transition metal ,Yield (chemistry) ,0202 electrical engineering, electronic engineering, information engineering ,Graphite ,Mg-based materials ,PEMFC ,0210 nano-technology ,green mobility applications ,Hydrogen production - Abstract
International audience; This paper focuses on hydrogen production for green mobility applications (other applications are currently under investigation). Firstly, a brief state of the art of hydrogen generation by hydrolysis with magnesium is shown. The hydrolysis performance of Magnesium powder ball–milled along with different additives (graphite and transition metals TM = Ni, Fe, and Al) is taken for comparison. The best performance was observed with Mg–10 wt.% g mixtures (95% of theoretical hydrogen generation yield in about 3 min). An efficient solution to control this hydrolysis reaction is proposed to produce hydrogen on demand and to feed a PEM fuel cell. Tests on a bench fitted with a 100 W Proton Exchange Membrane (PEM) fuel cell have demonstrated the technological potential of this solution for electric assistance applications in the field of light mobility.
- Published
- 2020
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