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Dynamics of CO2 absorption and desorption processes in alkanolamine with cosolvent polyethylene glycol / Jun Li in Industrial & engineering chemistry research, Vol. 51 N° 37 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 12081–12088 Titre : Dynamics of CO2 absorption and desorption processes in alkanolamine with cosolvent polyethylene glycol Type de document : texte imprimé Auteurs : Jun Li, Auteur ; Chenjia You, Auteur ; Lifang Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 12081–12088 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Dynamics  Absorption Résumé : To reduce the high energy consumption and equipment corrosion in conventional processes of CO2 capture with aqueous amine solutions, the mixed nonaqueous solvents of monoethanolamine (MEA), diethanolamine (DEA), and diglycolamine (DGA) with polyethylene glycol (PEG) as cosolvent were explored for CO2 capture. The dynamic experiments of CO2 absorption and desorption were carried out to evaluate the performance of the studied nonaqueous solutions. It demonstrated that the mixed solutions of amines and PEG exhibited higher CO2 cyclic capacity and regeneration efficiency compared with the only aqueous amine solutions. Especially, the solution of 3 mol/L DGA-PEG200 exhibits a high cyclic capacity of 0.438 mol CO2/mol DGA and a high regeneration efficiency of 94.6%, which indicates its great potential in industrial application. Moreover, the very low vapor pressure of PEG helps the mixed solution for CO2 capture with reduced corrosion, energy consumption, and environmental pollution. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301164v [article] Dynamics of CO2 absorption and desorption processes in alkanolamine with cosolvent polyethylene glycol [texte imprimé] / Jun Li, Auteur ; Chenjia You, Auteur ; Lifang Chen, Auteur . - 2012 . - pp. 12081–12088. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 37 (Septembre 2012) . - pp. 12081–12088 Mots-clés : Dynamics  Absorption Résumé : To reduce the high energy consumption and equipment corrosion in conventional processes of CO2 capture with aqueous amine solutions, the mixed nonaqueous solvents of monoethanolamine (MEA), diethanolamine (DEA), and diglycolamine (DGA) with polyethylene glycol (PEG) as cosolvent were explored for CO2 capture. The dynamic experiments of CO2 absorption and desorption were carried out to evaluate the performance of the studied nonaqueous solutions. It demonstrated that the mixed solutions of amines and PEG exhibited higher CO2 cyclic capacity and regeneration efficiency compared with the only aqueous amine solutions. Especially, the solution of 3 mol/L DGA-PEG200 exhibits a high cyclic capacity of 0.438 mol CO2/mol DGA and a high regeneration efficiency of 94.6%, which indicates its great potential in industrial application. Moreover, the very low vapor pressure of PEG helps the mixed solution for CO2 capture with reduced corrosion, energy consumption, and environmental pollution. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie301164v

Gold nanoparticles intercalated into the walls of mesoporous silica as a versatile redox catalyst / Lifang Chen in Industrial & engineering chemistry research, Vol. 50 N° 24 (Décembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13642–13649 Titre : Gold nanoparticles intercalated into the walls of mesoporous silica as a versatile redox catalyst Type de document : texte imprimé Auteurs : Lifang Chen, Auteur ; Juncheng Hu, Auteur ; Zhiwen Qi, Auteur Année de publication : 2012 Article en page(s) : pp. 13642–13649 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Nanoparticles  Mesoporous  Silica Résumé : A nanoscaled reactor framework of well-dispersed gold particles intercalated into the walls of mesoporous silica (GMS) was prepared by functionalizing silica with thioether groups. The GMS maintains mesoporous structure with uniform pores of 5.6 nm and possesses high surface area of more than 800 m2·g–1. Very recently, we reported that the GMS catalyst was very active for the oxidation of alkanes and alcohols but was also durable and recyclable. Here, we show that the catalyst is also very active for the reduction of p-nitrophenol (PNP) and methylene blue (MB) displaying catalytic activity in the reduction of PNP with Knor-PNP of 45.9 mmol–1·s–1. The unobstructed ordered mesoporous structure of the GMS catalyst and the small size of gold nanoparticles are the main factors leading to high catalytic activities. Further, for reduction of MB, the catalytic rate of the catalyst decreases by less than 6% when recycled 10 times. Therefore, the nanoreactor framework catalyst is very robust and is readily separable and reusable, demonstrating attractive potential for practical applications. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200606t [article] Gold nanoparticles intercalated into the walls of mesoporous silica as a versatile redox catalyst [texte imprimé] / Lifang Chen, Auteur ; Juncheng Hu, Auteur ; Zhiwen Qi, Auteur . - 2012 . - pp. 13642–13649. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 24 (Décembre 2011) . - pp. 13642–13649 Mots-clés : Nanoparticles  Mesoporous  Silica Résumé : A nanoscaled reactor framework of well-dispersed gold particles intercalated into the walls of mesoporous silica (GMS) was prepared by functionalizing silica with thioether groups. The GMS maintains mesoporous structure with uniform pores of 5.6 nm and possesses high surface area of more than 800 m2·g–1. Very recently, we reported that the GMS catalyst was very active for the oxidation of alkanes and alcohols but was also durable and recyclable. Here, we show that the catalyst is also very active for the reduction of p-nitrophenol (PNP) and methylene blue (MB) displaying catalytic activity in the reduction of PNP with Knor-PNP of 45.9 mmol–1·s–1. The unobstructed ordered mesoporous structure of the GMS catalyst and the small size of gold nanoparticles are the main factors leading to high catalytic activities. Further, for reduction of MB, the catalytic rate of the catalyst decreases by less than 6% when recycled 10 times. Therefore, the nanoreactor framework catalyst is very robust and is readily separable and reusable, demonstrating attractive potential for practical applications. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200606t