Documents disponibles écrits par cet auteur

Effect of alkaline catalysts on hydrothermal conversion of glycerin into lactic acid / Zheng Shen in Industrial & engineering chemistry research, Vol. 48 N° 19 (Octobre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8920–8925 Titre : Effect of alkaline catalysts on hydrothermal conversion of glycerin into lactic acid Type de document : texte imprimé Auteurs : Zheng Shen, Auteur ; Fangming Jin, Auteur ; Yalei Zhang, Auteur Année de publication : 2009 Article en page(s) : pp. 8920–8925 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Glycerin  Hydrothermal  treatment  Alkaline  catalysts  Lactic  acid Résumé : Hydrothermal treatment of glycerin was carried out at 300 °C by using eight alkaline catalysts, including hydroxides of alkali metals, alkaline-earth metals, and aluminum. All alkaline catalysts promoted the formation of lactic acid or lactate salts from glycerin, except for Al(OH)3. The alkali-metal hydroxides were more effective than alkaline-earth-metal hydroxides on the catalysis of hydrothermal reactions. On the hydrothermal conversion of glycerin into lactic acid, the catalytic effectiveness followed the sequence of KOH > NaOH > LiOH for alkali-metal hydroxides, and Ba(OH)2 > Sr(OH)2 > Ca(OH)2 > Mg(OH)2 for alkaline-earth hydroxides. An excellent lactic acid yield of 90% was attained on hydrothermal conversion of glycerin at 300 °C with KOH or NaOH as a catalyst. KOH was superior to NaOH as a catalyst since it worked at a lower concentration or within a shorter reaction time to obtain the same lactic acid yield. The hydrothermal conversion of glycerin depended not only on the hydroxide ion concentration but also on the metal ions of catalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900937d [article] Effect of alkaline catalysts on hydrothermal conversion of glycerin into lactic acid [texte imprimé] / Zheng Shen, Auteur ; Fangming Jin, Auteur ; Yalei Zhang, Auteur . - 2009 . - pp. 8920–8925. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 19 (Octobre 2009) . - pp. 8920–8925 Mots-clés : Glycerin  Hydrothermal  treatment  Alkaline  catalysts  Lactic  acid Résumé : Hydrothermal treatment of glycerin was carried out at 300 °C by using eight alkaline catalysts, including hydroxides of alkali metals, alkaline-earth metals, and aluminum. All alkaline catalysts promoted the formation of lactic acid or lactate salts from glycerin, except for Al(OH)3. The alkali-metal hydroxides were more effective than alkaline-earth-metal hydroxides on the catalysis of hydrothermal reactions. On the hydrothermal conversion of glycerin into lactic acid, the catalytic effectiveness followed the sequence of KOH > NaOH > LiOH for alkali-metal hydroxides, and Ba(OH)2 > Sr(OH)2 > Ca(OH)2 > Mg(OH)2 for alkaline-earth hydroxides. An excellent lactic acid yield of 90% was attained on hydrothermal conversion of glycerin at 300 °C with KOH or NaOH as a catalyst. KOH was superior to NaOH as a catalyst since it worked at a lower concentration or within a shorter reaction time to obtain the same lactic acid yield. The hydrothermal conversion of glycerin depended not only on the hydroxide ion concentration but also on the metal ions of catalysts. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900937d

Hydrogen-transfer reduction of ketones into corresponding alcohols using formic acid as a hydrogen donor without a metal catalyst in high-temperature water / Zheng Shen in Industrial & engineering chemistry research, Vol. 49 N° 13 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6255–6259 Titre : Hydrogen-transfer reduction of ketones into corresponding alcohols using formic acid as a hydrogen donor without a metal catalyst in high-temperature water Type de document : texte imprimé Auteurs : Zheng Shen, Auteur ; Yalei Zhang, Auteur ; Fangming Jin, Auteur Année de publication : 2010 Article en page(s) : pp. 6255–6259 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Hydrothermal  reactions  Hydrogen  transferring  Ketones Résumé : In hydrothermal reactions at 260−300 °C, ketones can be reduced into corresponding alcohols by hydrogen transferring from another alcohols or formic acid without a metal catalyst. When using formic acid as a hydrogen donor, the yield of alcohols at respective better conditions was considerably high at a much lower ratio of hydrogen source to ketones compared to traditional Meerwein−Poundrof−Verley (MPV) reduction, reaching 60% for isopropanol from acetone and 70% for lactic acid from pyruvic acid. The proposed possible mechanism for the hydrogen transfer reduction of ketones in high-temperature water (HTW) is similar to the pathway elucidated in the traditional MPV reduction via a transition state. Rather than metal-alkoxides catalysts in MPV reduction, water molecules in HTW as a catalyst may directly participate in the transition state by making a hydrogen-bond ring network with three molecules, that is, ketone, formic acid, and water. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100598a [article] Hydrogen-transfer reduction of ketones into corresponding alcohols using formic acid as a hydrogen donor without a metal catalyst in high-temperature water [texte imprimé] / Zheng Shen, Auteur ; Yalei Zhang, Auteur ; Fangming Jin, Auteur . - 2010 . - pp. 6255–6259. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 13 (Juillet 2010) . - pp. 6255–6259 Mots-clés : Hydrothermal  reactions  Hydrogen  transferring  Ketones Résumé : In hydrothermal reactions at 260−300 °C, ketones can be reduced into corresponding alcohols by hydrogen transferring from another alcohols or formic acid without a metal catalyst. When using formic acid as a hydrogen donor, the yield of alcohols at respective better conditions was considerably high at a much lower ratio of hydrogen source to ketones compared to traditional Meerwein−Poundrof−Verley (MPV) reduction, reaching 60% for isopropanol from acetone and 70% for lactic acid from pyruvic acid. The proposed possible mechanism for the hydrogen transfer reduction of ketones in high-temperature water (HTW) is similar to the pathway elucidated in the traditional MPV reduction via a transition state. Rather than metal-alkoxides catalysts in MPV reduction, water molecules in HTW as a catalyst may directly participate in the transition state by making a hydrogen-bond ring network with three molecules, that is, ketone, formic acid, and water. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100598a

A Potentially useful technology by mimicking nature — rapid conversion of biomass and CO2 into chemicals and fuels under hydrothermal conditions / Fangming Jin in Industrial & engineering chemistry research, Vol. 51 N° 30 (Août 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 9921-9937 Titre : A Potentially useful technology by mimicking nature — rapid conversion of biomass and CO2 into chemicals and fuels under hydrothermal conditions Type de document : texte imprimé Auteurs : Fangming Jin, Auteur ; Xu Zeng, Auteur ; Zhenzi Jing, Auteur Année de publication : 2012 Article en page(s) : pp. 9921-9937 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Hydrothermal  condition  Fuel  Carbon  dioxide  Biomass Résumé : To diminish a serious global energy crisis and global warming caused by the imbalance between the slow formation of fossil fuels and rapid consumption by human activities, the developing of the technology for quickly turning biomass and CO2 into fuels and chemicals is needed. Hydrothermal reactions, which can be recognized as an effective pathway in the carbon cycle, played an important role in forming petroleum, natural gas, and coal from organic wastes. If humans could simulate the natural phenomena of the formation of fossils, then, it should quickly turn biomass and CO2 into fuels and chemicals. This paper gives an overview of some recent studies on hydrothermal conversion of biomass such as carbohydrate, lignin, and glycerin into value-added chemicals. Some recent advance in hydrothermal reduction of CO2 is also presented. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201404 [article] A Potentially useful technology by mimicking nature — rapid conversion of biomass and CO2 into chemicals and fuels under hydrothermal conditions [texte imprimé] / Fangming Jin, Auteur ; Xu Zeng, Auteur ; Zhenzi Jing, Auteur . - 2012 . - pp. 9921-9937. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 30 (Août 2012) . - pp. 9921-9937 Mots-clés : Hydrothermal  condition  Fuel  Carbon  dioxide  Biomass Résumé : To diminish a serious global energy crisis and global warming caused by the imbalance between the slow formation of fossil fuels and rapid consumption by human activities, the developing of the technology for quickly turning biomass and CO2 into fuels and chemicals is needed. Hydrothermal reactions, which can be recognized as an effective pathway in the carbon cycle, played an important role in forming petroleum, natural gas, and coal from organic wastes. If humans could simulate the natural phenomena of the formation of fossils, then, it should quickly turn biomass and CO2 into fuels and chemicals. This paper gives an overview of some recent studies on hydrothermal conversion of biomass such as carbohydrate, lignin, and glycerin into value-added chemicals. Some recent advance in hydrothermal reduction of CO2 is also presented. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26201404

Synthesis of Cd hydroxide particles with hollow structures by a one - step process / Ying Tian in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13585–13588 Titre : Synthesis of Cd hydroxide particles with hollow structures by a one - step process Type de document : texte imprimé Auteurs : Ying Tian, Auteur ; Xin Cui, Auteur ; Fangming Jin, Auteur Année de publication : 2012 Article en page(s) : pp. 13585–13588 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Hydroxide Résumé : Cd4Cl3(OH)5 particles, for use as a CdS photocatalyst precursor with hollow morphology, were successfully synthesized at room temperature via a one-step process, using boric acid or sodium borate as a buffer. The identification of the morphology and characterization of synthesized particles by high-resolution transmission electron microscopy coupled with energy-dispersive X-ray analysis (HR-TEM/EDX) and X-ray diffraction (XRD) revealed that Cd4Cl3(OH)5 was the main compound. with a size of 40–100 nm, and boron was mostly concentrated on the shell covering nanosized Cd4Cl3(OH)5 particles. Compared with the traditional synthetic methods, this approach has benefits of direct, easy synthesis without the need for additional treatment. It is suggested that boron should play an important role in the synthesis of hollow morphology. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201518t [article] Synthesis of Cd hydroxide particles with hollow structures by a one - step process [texte imprimé] / Ying Tian, Auteur ; Xin Cui, Auteur ; Fangming Jin, Auteur . - 2012 . - pp. 13585–13588. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13585–13588 Mots-clés : Hydroxide Résumé : Cd4Cl3(OH)5 particles, for use as a CdS photocatalyst precursor with hollow morphology, were successfully synthesized at room temperature via a one-step process, using boric acid or sodium borate as a buffer. The identification of the morphology and characterization of synthesized particles by high-resolution transmission electron microscopy coupled with energy-dispersive X-ray analysis (HR-TEM/EDX) and X-ray diffraction (XRD) revealed that Cd4Cl3(OH)5 was the main compound. with a size of 40–100 nm, and boron was mostly concentrated on the shell covering nanosized Cd4Cl3(OH)5 particles. Compared with the traditional synthetic methods, this approach has benefits of direct, easy synthesis without the need for additional treatment. It is suggested that boron should play an important role in the synthesis of hollow morphology. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201518t