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H2SO4 - catalyzed hydrothermal pretreatment of triploid poplar to enhance enzymatic hydrolysis / Haiyan Yang in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11598-11604 Titre : H2SO4 - catalyzed hydrothermal pretreatment of triploid poplar to enhance enzymatic hydrolysis Type de document : texte imprimé Auteurs : Haiyan Yang, Auteur ; Kun Wang, Auteur ; Feng Xu, Auteur Année de publication : 2012 Article en page(s) : pp. 11598-11604 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrolysis  Pretreatment  Catalytic  reaction Résumé : Sealed structure of plant biomass resists assault on cellulose from enzymatic deconstruction. In this study, pretreatments of triploid poplar were conducted with 0.5 wt % H2SO4 at various temperatures (100―200 °C) to loosen the intricate structure. The effect of temperature on cellulose structure and enzymatic digestibility was evaluated. The results indicated that the effective removal of hemicelluloses and amorphous cellulose incurred the increment of crystalline indices of residues. Companied with the degradation of carbohydrates, inhibitory compounds were accumulated with the increasing severity. On the whole, 120 °C was considered as the optimum temperature by taking the balance between substrate digestibility and recovery into account. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350324 [article] H2SO4 - catalyzed hydrothermal pretreatment of triploid poplar to enhance enzymatic hydrolysis [texte imprimé] / Haiyan Yang, Auteur ; Kun Wang, Auteur ; Feng Xu, Auteur . - 2012 . - pp. 11598-11604. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11598-11604 Mots-clés : Hydrolysis  Pretreatment  Catalytic  reaction Résumé : Sealed structure of plant biomass resists assault on cellulose from enzymatic deconstruction. In this study, pretreatments of triploid poplar were conducted with 0.5 wt % H2SO4 at various temperatures (100―200 °C) to loosen the intricate structure. The effect of temperature on cellulose structure and enzymatic digestibility was evaluated. The results indicated that the effective removal of hemicelluloses and amorphous cellulose incurred the increment of crystalline indices of residues. Companied with the degradation of carbohydrates, inhibitory compounds were accumulated with the increasing severity. On the whole, 120 °C was considered as the optimum temperature by taking the balance between substrate digestibility and recovery into account. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350324

Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks / Kun Wang in Industrial & engineering chemistry research, Vol. 49 N° 18 (Septembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8797–8804 Titre : Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks Type de document : texte imprimé Auteurs : Kun Wang, Auteur ; Feng Xu, Auteur ; Run-Cang Sun, Auteur Année de publication : 2010 Article en page(s) : pp. 8797–8804 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Physicochemical  properties Résumé : Hemicellulosic polysaccharides were isolated from the raw and steam-exploded Lespedeza crytobytrya stalks by sequential 1 M NaOH extraction and fractionated into Hemi-a and Hemi-b fractions by acidification and ethanol precipitation, respectively. The Hemi-a fractions had relatively lower molecular weights and took up 84.6−95.5% of the total released hemicelluloses. After steam explosion, both hemicellulosic fractions were obviously degraded, and a certain amount of glucose or oligosaccharides derived from the amorphous cellulose was coisolated. The influence of increasing incubation time from 2 to 10 min is further discussed, based on the physicochemical properties of the obtained hemicelluloses characterized in terms of sugar component, gel permeation chromatography (GPC), thermal stability, and 13C NMR spectroscopy analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101180p [article] Influence of Incubation Time on the Physicochemical Properties of the isolated hemicelluloses from steam-exploded lespedeza stalks [texte imprimé] / Kun Wang, Auteur ; Feng Xu, Auteur ; Run-Cang Sun, Auteur . - 2010 . - pp. 8797–8804. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 18 (Septembre 2010) . - pp. 8797–8804 Mots-clés : Physicochemical  properties Résumé : Hemicellulosic polysaccharides were isolated from the raw and steam-exploded Lespedeza crytobytrya stalks by sequential 1 M NaOH extraction and fractionated into Hemi-a and Hemi-b fractions by acidification and ethanol precipitation, respectively. The Hemi-a fractions had relatively lower molecular weights and took up 84.6−95.5% of the total released hemicelluloses. After steam explosion, both hemicellulosic fractions were obviously degraded, and a certain amount of glucose or oligosaccharides derived from the amorphous cellulose was coisolated. The influence of increasing incubation time from 2 to 10 min is further discussed, based on the physicochemical properties of the obtained hemicelluloses characterized in terms of sugar component, gel permeation chromatography (GPC), thermal stability, and 13C NMR spectroscopy analysis. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101180p

Morphology and catalytic performance of flake - shaped NiO - yttria - stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains / Yuzhou Wu in Industrial & engineering chemistry research, Vol. 51 N° 18 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6387-6394 Titre : Morphology and catalytic performance of flake - shaped NiO - yttria - stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains Type de document : texte imprimé Auteurs : Yuzhou Wu, Auteur ; Wang, Wei, Auteur ; Kun Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 6387-6394 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Catalytic  reaction  Morphology Résumé : The flake-shaped NiO-yttria-stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains were synthesized using the sucrose-concentrated H2SO4, dehydration reaction, and their microstructure was characterized by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). To evaluate the properties of the flakeshaped NiO-YSZ particles as the anode materials for solid oxide fuel cells, the reduction temperature of the flake-shaped NiO-YSZ particles and catalytic activity on the methane steam/CO2 reforming reactions of the H2-reduced particles as well as the electrochemical impedance spectra of the YSZ supported symmetrical cells with the electrodes made from these particles were examined in comparison with the mixed commercial NiO-YSZ. HRTEM revealed that the nanocrystalline YSZ was dispersed in the NiO matrix and distributed on the surface of the flake-shaped NiO-YSZ particles. The catalytic performance of the flake-shaped NiO-YSZ particles was better than that of the mixed commercial NiO-YSZ in both steam reforming and CO2 reforming of methane. The symmetrical cell made from the flake-shaped NiO-YSZ exhibited a much lower polarization resistance at the operating temperatures below 800 °C than that made from the mixed commercial NiO-YSZ. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867290 [article] Morphology and catalytic performance of flake - shaped NiO - yttria - stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains [texte imprimé] / Yuzhou Wu, Auteur ; Wang, Wei, Auteur ; Kun Wang, Auteur . - 2012 . - pp. 6387-6394. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 18 (Mai 2012) . - pp. 6387-6394 Mots-clés : Catalytic  reaction  Morphology Résumé : The flake-shaped NiO-yttria-stabilized zirconia (YSZ) particles with nanocrystalline YSZ grains were synthesized using the sucrose-concentrated H2SO4, dehydration reaction, and their microstructure was characterized by scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM). To evaluate the properties of the flakeshaped NiO-YSZ particles as the anode materials for solid oxide fuel cells, the reduction temperature of the flake-shaped NiO-YSZ particles and catalytic activity on the methane steam/CO2 reforming reactions of the H2-reduced particles as well as the electrochemical impedance spectra of the YSZ supported symmetrical cells with the electrodes made from these particles were examined in comparison with the mixed commercial NiO-YSZ. HRTEM revealed that the nanocrystalline YSZ was dispersed in the NiO matrix and distributed on the surface of the flake-shaped NiO-YSZ particles. The catalytic performance of the flake-shaped NiO-YSZ particles was better than that of the mixed commercial NiO-YSZ in both steam reforming and CO2 reforming of methane. The symmetrical cell made from the flake-shaped NiO-YSZ exhibited a much lower polarization resistance at the operating temperatures below 800 °C than that made from the mixed commercial NiO-YSZ. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25867290