Documents disponibles écrits par cet auteur

Homogeneous synthesis and characterization of cellulose acetate butyrate (CAB) in 1-Allyl-3-methylimidazolium chloride (AmimCl) ionic liquid / Yan Cao in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7808–7814 Titre : Homogeneous synthesis and characterization of cellulose acetate butyrate (CAB) in 1-Allyl-3-methylimidazolium chloride (AmimCl) ionic liquid Type de document : texte imprimé Auteurs : Yan Cao, Auteur ; Huiquan Li, Auteur ; Jun Zhang, Auteur Année de publication : 2011 Article en page(s) : pp. 7808–7814 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquid Résumé : Cellulose acetate butyrate (CAB) with butyryl content of 6–47 wt % was homogeneously synthesized in 1-allyl-3-methylimidazolium chloride (AmimCl) in a single step without using any catalysts. The effects of different acylating agents (acetic anhydride and butyric anhydride) addition methods and reaction conditions on the acyl content of CABs were investigated. Synthesized CABs were characterized by FTIR, NMR, solubility, and thermal analysis. The acylating agents addition method influences the butyryl content, substituent distribution within the anhydroglucose units (AGU), and the properties of CAB. The CAB obtained with butyryl content greater than 38% is completely soluble in 2-methyl–ethyl ketone, 1,2-dichloromethane, ethyl acetate, and butyl acetate. After the mix-acylation, AmimCl can be easily recycled and reused. This study provides a novel way for the clean production of CAB under mild conditions for future industrial applications. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332103 [article] Homogeneous synthesis and characterization of cellulose acetate butyrate (CAB) in 1-Allyl-3-methylimidazolium chloride (AmimCl) ionic liquid [texte imprimé] / Yan Cao, Auteur ; Huiquan Li, Auteur ; Jun Zhang, Auteur . - 2011 . - pp. 7808–7814. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7808–7814 Mots-clés : Ionic  liquid Résumé : Cellulose acetate butyrate (CAB) with butyryl content of 6–47 wt % was homogeneously synthesized in 1-allyl-3-methylimidazolium chloride (AmimCl) in a single step without using any catalysts. The effects of different acylating agents (acetic anhydride and butyric anhydride) addition methods and reaction conditions on the acyl content of CABs were investigated. Synthesized CABs were characterized by FTIR, NMR, solubility, and thermal analysis. The acylating agents addition method influences the butyryl content, substituent distribution within the anhydroglucose units (AGU), and the properties of CAB. The CAB obtained with butyryl content greater than 38% is completely soluble in 2-methyl–ethyl ketone, 1,2-dichloromethane, ethyl acetate, and butyl acetate. After the mix-acylation, AmimCl can be easily recycled and reused. This study provides a novel way for the clean production of CAB under mild conditions for future industrial applications. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332103

Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts / Shuang Deng in Industrial & engineering chemistry research, Vol. 48 N° 16 (Août 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7561–7566 Titre : Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts Type de document : texte imprimé Auteurs : Shuang Deng, Auteur ; Songgeng Li, Auteur ; Huiquan Li, Auteur Année de publication : 2009 Article en page(s) : pp. 7561–7566 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Fe−Cr/ZrO2  catalysts  Thermogravimetric  analysis  Ethylene  Ethane  Dehydrogenation Résumé : The catalytic performance of Fe−Cr/ZrO2 catalysts, prepared by two different methods—coprecipitation and coprecipitation−impregnation were examined in oxidative dehydrogenation of ethane to ethylene using CO2 as an oxidant. Thermogravimetric analysis and physicochemical characterization such as XPS, XRD, and BET were performed to explore the correlation of catalytic performance with physicochemical properties of the catalysts. Catalytic tests show that Fe−Cr/ZrO2 catalysts prepared by coprecipitation−impregnation have higher catalytic stability, higher CO2 conversion, and lower ethylene selectivity in comparison to Fe−Cr/ZrO2 prepared by coprecipitation. The characterization results indicate that the dehydrogenation of ethane is activated by Cr3+ species and Fe3O4 is formed during the reaction, which can promote the reverse WGS reaction. Coke deposition is the main reason of the deactivation of the catalysts. A possible reaction mechanism was proposed on the basis of these results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007387 [article] Oxidative dehydrogenation of ethane to ethylene with CO2 over Fe-Cr/ZrO2 catalysts [texte imprimé] / Shuang Deng, Auteur ; Songgeng Li, Auteur ; Huiquan Li, Auteur . - 2009 . - pp. 7561–7566. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 16 (Août 2009) . - pp. 7561–7566 Mots-clés : Fe−Cr/ZrO2  catalysts  Thermogravimetric  analysis  Ethylene  Ethane  Dehydrogenation Résumé : The catalytic performance of Fe−Cr/ZrO2 catalysts, prepared by two different methods—coprecipitation and coprecipitation−impregnation were examined in oxidative dehydrogenation of ethane to ethylene using CO2 as an oxidant. Thermogravimetric analysis and physicochemical characterization such as XPS, XRD, and BET were performed to explore the correlation of catalytic performance with physicochemical properties of the catalysts. Catalytic tests show that Fe−Cr/ZrO2 catalysts prepared by coprecipitation−impregnation have higher catalytic stability, higher CO2 conversion, and lower ethylene selectivity in comparison to Fe−Cr/ZrO2 prepared by coprecipitation. The characterization results indicate that the dehydrogenation of ethane is activated by Cr3+ species and Fe3O4 is formed during the reaction, which can promote the reverse WGS reaction. Coke deposition is the main reason of the deactivation of the catalysts. A possible reaction mechanism was proposed on the basis of these results. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9007387

Selective leaching of steelmaking slag for indirect CO2 mineral sequestration / Weijun Bao in Industrial & engineering chemistry research, Vol. 49 N° 5 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2055–2063 Titre : Selective leaching of steelmaking slag for indirect CO2 mineral sequestration Type de document : texte imprimé Auteurs : Weijun Bao, Auteur ; Huiquan Li, Auteur ; Zhang, Yi, Auteur Année de publication : 2010 Article en page(s) : pp. 2055–2063 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : CO2;  Steelmaking;  Lleaching;  Calcium  ions;  Indirect  CO2  mineral Résumé : Indirect CO2 mineral sequestration, which could make CO2 fixate into precipitated calcium carbonate (PCC) of value-added products, is an important technology that is used to reduce greenhouse gas emissions economically. It can be conducted in two steps, one of which has been investigated in the previous paper. In this work, extraction of calcium ions from steelmaking slag using a novel leaching medium, which involves organic solvent tributyl phosphate (TBP), acetic acid, and ultrapure water, was studied. Several operating variables, including stirring speed, phase-volume ratio, organic solvent-to-solid ratio, initial acetic acid concentration, acid-to-slag ratio, reaction temperature, and reaction time were investigated. It was found that the leaching process could be divided into three regions according to the acid-to-slag ratio. The first region below 0.5 g/g was characterized by the acid-to-solid ratio; the second region above 0.5 g/g but below 1.0 g/g was characterized by the acid-to-solid ratio; and the third region above 1.0 g/g was characterized by the acid-to-solid ratio. When the acid-to-solid ratio was below 1.0 g/g, only Ca and Mg could be leached with the maximum leached ratios of 75% and 35%, respectively. Moreover, the leaching behaviors of Ca, Mg, Fe, Al, and Si were greatly affected by reaction temperature and reaction time. Results show that the calcium ions can be effectively and selectively extracted from the steelmaking slag and that the reaction medium can be recovered and recycled with high efficiency. These are the keys to indirect CO2 mineral sequestration. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801850s [article] Selective leaching of steelmaking slag for indirect CO2 mineral sequestration [texte imprimé] / Weijun Bao, Auteur ; Huiquan Li, Auteur ; Zhang, Yi, Auteur . - 2010 . - pp. 2055–2063. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 5 (Mars 2010) . - pp. 2055–2063 Mots-clés : CO2;  Steelmaking;  Lleaching;  Calcium  ions;  Indirect  CO2  mineral Résumé : Indirect CO2 mineral sequestration, which could make CO2 fixate into precipitated calcium carbonate (PCC) of value-added products, is an important technology that is used to reduce greenhouse gas emissions economically. It can be conducted in two steps, one of which has been investigated in the previous paper. In this work, extraction of calcium ions from steelmaking slag using a novel leaching medium, which involves organic solvent tributyl phosphate (TBP), acetic acid, and ultrapure water, was studied. Several operating variables, including stirring speed, phase-volume ratio, organic solvent-to-solid ratio, initial acetic acid concentration, acid-to-slag ratio, reaction temperature, and reaction time were investigated. It was found that the leaching process could be divided into three regions according to the acid-to-slag ratio. The first region below 0.5 g/g was characterized by the acid-to-solid ratio; the second region above 0.5 g/g but below 1.0 g/g was characterized by the acid-to-solid ratio; and the third region above 1.0 g/g was characterized by the acid-to-solid ratio. When the acid-to-solid ratio was below 1.0 g/g, only Ca and Mg could be leached with the maximum leached ratios of 75% and 35%, respectively. Moreover, the leaching behaviors of Ca, Mg, Fe, Al, and Si were greatly affected by reaction temperature and reaction time. Results show that the calcium ions can be effectively and selectively extracted from the steelmaking slag and that the reaction medium can be recovered and recycled with high efficiency. These are the keys to indirect CO2 mineral sequestration. Note de contenu : Bibliogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801850s