Documents disponibles écrits par cet auteur

Characterization of Oxygen Scavenging Films Based on 1,4-Polybutadiene / Hua Li in Industrial & engineering chemistry research, Vol. 51 N° 21 (Mai 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7138-7145 Titre : Characterization of Oxygen Scavenging Films Based on 1,4-Polybutadiene Type de document : texte imprimé Auteurs : Hua Li, Auteur ; Kevin K. Tung, Auteur ; D. R. Paul, Auteur Année de publication : 2012 Article en page(s) : pp. 7138-7145 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Polybutadiene Résumé : To better characterize the fundamentals of oxygen scavenging as a means to prepare high oxygen barrier polymer films, the oxidation of 1,4-polybutadiene, in the presence of a transition metal salt catalyst, cobalt neodecanoate, was studied at 30 °C. Oxygen uptake of 1,4-polybutadiene films was measured as a function of cobalt neodecanoate concentration. In these samples, oxygen mass uptake values as high as 15 wt % were observed, and the kinetics of oxidation were of the order of 10 days. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis suggest that the oxidation was heterogeneous, with the film surface being highly oxidized and the film center being less oxidized. Interestingly, the oxygen uptake exhibited a maximum with catalyst loading, which is believed to be related to the heterogeneous nature of the oxidation process. Since antioxidants are typically added during the industrial scale preparation and the amount of antioxidants would affect the oxygen mass uptake value and oxidation kinetics, the importance of an antioxidant removal method and a normalized purification strategy were determined prior to oxygen uptake experiments. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201905j [article] Characterization of Oxygen Scavenging Films Based on 1,4-Polybutadiene [texte imprimé] / Hua Li, Auteur ; Kevin K. Tung, Auteur ; D. R. Paul, Auteur . - 2012 . - pp. 7138-7145. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 21 (Mai 2012) . - pp. 7138-7145 Mots-clés : Polybutadiene Résumé : To better characterize the fundamentals of oxygen scavenging as a means to prepare high oxygen barrier polymer films, the oxidation of 1,4-polybutadiene, in the presence of a transition metal salt catalyst, cobalt neodecanoate, was studied at 30 °C. Oxygen uptake of 1,4-polybutadiene films was measured as a function of cobalt neodecanoate concentration. In these samples, oxygen mass uptake values as high as 15 wt % were observed, and the kinetics of oxidation were of the order of 10 days. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis suggest that the oxidation was heterogeneous, with the film surface being highly oxidized and the film center being less oxidized. Interestingly, the oxygen uptake exhibited a maximum with catalyst loading, which is believed to be related to the heterogeneous nature of the oxidation process. Since antioxidants are typically added during the industrial scale preparation and the amount of antioxidants would affect the oxygen mass uptake value and oxidation kinetics, the importance of an antioxidant removal method and a normalized purification strategy were determined prior to oxygen uptake experiments. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201905j

Low - temperature selective catalytic reduction of NOx with NH3 over Fe – Mn mixed - oxide catalysts containing Fe3Mn3O8 phase / Zhihang Chen in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 202–212 Titre : Low - temperature selective catalytic reduction of NOx with NH3 over Fe – Mn mixed - oxide catalysts containing Fe3Mn3O8 phase Type de document : texte imprimé Auteurs : Zhihang Chen, Auteur ; Furong Wang, Auteur ; Hua Li, Auteur Année de publication : 2012 Article en page(s) : pp. 202–212 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalytic  reduction  Oxide Résumé : Novel Fe–Mn mixed-oxide catalysts were prepared for the low-temperature selective catalytic reduction (SCR) of NOx with ammonia in the presence of excess oxygen. It was found that Fe(0.4)–MnOx catalyst showed the highest activity, yielding 98.8% NOx conversion and 100% selectivity of N2 at 120 °C at a space velocity of 30 000 h–1. XRD results suggested that a new crystal phase of Fe3Mn3O8 was formed in the Fe–MnOx catalysts. TPR and Raman data showed that there was a strong interaction between the iron oxide and manganese oxide, which is responsible for the formation of the active center―Fe3Mn3O8. Intensive analysis of fresh, used, and regenerated catalysts by XPS revealed that electron transfer between Fen+ and Mnn+ ions in Fe3Mn3O8 may account for the long lifetime of the Fe(0.4)–MnOx catalyst. In addition, the SCR activity was suppressed a little in the presence of SO2 and H2O, but it was reversible after their removal. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201894c [article] Low - temperature selective catalytic reduction of NOx with NH3 over Fe – Mn mixed - oxide catalysts containing Fe3Mn3O8 phase [texte imprimé] / Zhihang Chen, Auteur ; Furong Wang, Auteur ; Hua Li, Auteur . - 2012 . - pp. 202–212. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 202–212 Mots-clés : Catalytic  reduction  Oxide Résumé : Novel Fe–Mn mixed-oxide catalysts were prepared for the low-temperature selective catalytic reduction (SCR) of NOx with ammonia in the presence of excess oxygen. It was found that Fe(0.4)–MnOx catalyst showed the highest activity, yielding 98.8% NOx conversion and 100% selectivity of N2 at 120 °C at a space velocity of 30 000 h–1. XRD results suggested that a new crystal phase of Fe3Mn3O8 was formed in the Fe–MnOx catalysts. TPR and Raman data showed that there was a strong interaction between the iron oxide and manganese oxide, which is responsible for the formation of the active center―Fe3Mn3O8. Intensive analysis of fresh, used, and regenerated catalysts by XPS revealed that electron transfer between Fen+ and Mnn+ ions in Fe3Mn3O8 may account for the long lifetime of the Fe(0.4)–MnOx catalyst. In addition, the SCR activity was suppressed a little in the presence of SO2 and H2O, but it was reversible after their removal. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie201894c

Solubilities of pimelic acid in ionic liquids / Hua Li in Industrial & engineering chemistry research, Vol. 50 N° 17 (Septembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10370-10372 Titre : Solubilities of pimelic acid in ionic liquids Type de document : texte imprimé Auteurs : Hua Li, Auteur ; Juan Liu, Auteur ; Daokui Tang, Auteur Année de publication : 2011 Article en page(s) : pp. 10370-10372 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Ionic  liquid  Solubility Résumé : The solubilities of pimelic acid in ionic liquids [EMIM][HSO4], [PMIM]Br, [i-PMIM] [HSO4], [BMIM]Br, and [BMIM] [HSO4] are determined with the suitable experimental methods and apparatus. The experimental data of solubilities are correlated with the Apelblat equation. The solubilities correlated by the model are in good agreement with experimental data. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483684 [article] Solubilities of pimelic acid in ionic liquids [texte imprimé] / Hua Li, Auteur ; Juan Liu, Auteur ; Daokui Tang, Auteur . - 2011 . - pp. 10370-10372. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 17 (Septembre 2011) . - pp. 10370-10372 Mots-clés : Ionic  liquid  Solubility Résumé : The solubilities of pimelic acid in ionic liquids [EMIM][HSO4], [PMIM]Br, [i-PMIM] [HSO4], [BMIM]Br, and [BMIM] [HSO4] are determined with the suitable experimental methods and apparatus. The experimental data of solubilities are correlated with the Apelblat equation. The solubilities correlated by the model are in good agreement with experimental data. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24483684

Study on separation and purification of genistein in the soybean residue using macroporous resin adsorption / Hua Li in Industrial & engineering chemistry research, Vol. 51 N° 1 (Janvier 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 44-49 Titre : Study on separation and purification of genistein in the soybean residue using macroporous resin adsorption Type de document : texte imprimé Auteurs : Hua Li, Auteur ; Juan Liu, Auteur ; Li, Dan, Auteur Année de publication : 2012 Article en page(s) : pp. 44-49 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Adsorption  Macroporosity  Purification Résumé : Soybean residue is a rich byproduct that is discarded in soybean processing factories. In this research, soybean residue was used to prepare highly valued genistein by separation and purification through the combination ofisoelectric point precipitation, centrifugation, solvent extraction, and macroporous resin adsorption. The purification process had been studied in detail. The results showed that AB-8 resin, feathering high adsorption and desorption recovery, is a suitable resin for purifying genistein, and a optimized process for gradient elution was obtained: the extracts was sequentially eluted with deionized water, 20% ethanol, and 70% ethanol in the first process, and with 40% ethanol and 70% ethanol in the second process; the purity of genistein was about 90% by high-performance liquid chromatography (HPLC) analysis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476444 [article] Study on separation and purification of genistein in the soybean residue using macroporous resin adsorption [texte imprimé] / Hua Li, Auteur ; Juan Liu, Auteur ; Li, Dan, Auteur . - 2012 . - pp. 44-49. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 1 (Janvier 2012) . - pp. 44-49 Mots-clés : Adsorption  Macroporosity  Purification Résumé : Soybean residue is a rich byproduct that is discarded in soybean processing factories. In this research, soybean residue was used to prepare highly valued genistein by separation and purification through the combination ofisoelectric point precipitation, centrifugation, solvent extraction, and macroporous resin adsorption. The purification process had been studied in detail. The results showed that AB-8 resin, feathering high adsorption and desorption recovery, is a suitable resin for purifying genistein, and a optimized process for gradient elution was obtained: the extracts was sequentially eluted with deionized water, 20% ethanol, and 70% ethanol in the first process, and with 40% ethanol and 70% ethanol in the second process; the purity of genistein was about 90% by high-performance liquid chromatography (HPLC) analysis. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25476444

Thermodynamics of the solubility of KF in N,N - dimethyl ethanolamine, pyridine, diethanolamine, and sulfolane from 308.73 to 367.37 K / Hua Li in Industrial & engineering chemistry research, Vol. 51 N° 15 (Avril 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5592-5595 Titre : Thermodynamics of the solubility of KF in N,N - dimethyl ethanolamine, pyridine, diethanolamine, and sulfolane from 308.73 to 367.37 K Type de document : texte imprimé Auteurs : Hua Li, Auteur ; Juan Liu, Auteur ; Xiaoshuang Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 5592-5595 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Solubility Résumé : The solubilities of potassium fluoride (KF) in the different nonproton polar solvents N,N-dimethyl ethanolamine, pyridine, diethanolamine, and sulfolane have been determined using a dynamic method at temperatures ranging from 308.73 to 367.37 K. The experimental data were correlated with the modified Apelblat equation, and the solubilities correlated by the Apelblat model showed good agreement with the experimental data. It provided the basic data for preparation of 2,3,4,5-tetrafluorobenzoic acid. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815839 [article] Thermodynamics of the solubility of KF in N,N - dimethyl ethanolamine, pyridine, diethanolamine, and sulfolane from 308.73 to 367.37 K [texte imprimé] / Hua Li, Auteur ; Juan Liu, Auteur ; Xiaoshuang Chen, Auteur . - 2012 . - pp. 5592-5595. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 15 (Avril 2012) . - pp. 5592-5595 Mots-clés : Solubility Résumé : The solubilities of potassium fluoride (KF) in the different nonproton polar solvents N,N-dimethyl ethanolamine, pyridine, diethanolamine, and sulfolane have been determined using a dynamic method at temperatures ranging from 308.73 to 367.37 K. The experimental data were correlated with the modified Apelblat equation, and the solubilities correlated by the Apelblat model showed good agreement with the experimental data. It provided the basic data for preparation of 2,3,4,5-tetrafluorobenzoic acid. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=25815839