Documents disponibles écrits par cet auteur

Carbon dioxide capture by amine - impregnated mesocellular - foam - containing template / Yan, Wei in Industrial & engineering chemistry research, Vol. 51 N° 9 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3653–3662 Titre : Carbon dioxide capture by amine - impregnated mesocellular - foam - containing template Type de document : texte imprimé Auteurs : Yan, Wei, Auteur ; Jing Tang, Auteur ; Zijun Bian, Auteur Année de publication : 2012 Article en page(s) : pp. 3653–3662 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Silica  mesocellular  Dioxide Résumé : By impregnating polyethylenimine (PEI) into silica mesocellular foam with the template remaining (MCF(a)), a novel sorbent with both high CO2 adsorption capacity and high thermal stability was obtained. The remaining P123 template in the MCF played a great role in promoting the CO2 adsorption capacity, which could be 4.5 mmol·g–1 (adsorbent) when the amount of amine loading and the adsorption temperature were optimized as 60% and at 70 °C for the sample MCF(a)/PEI. Meanwhile, MCF(a)/PEI had a high thermal stability and selectivity, after 10 adsorption–desorption cycles, MCF(a)/PEI almost held a constant adsorption capacity; for different compositions of CO2 and N2 mixed gases, it always kept a high adsorption selectivity of CO2/N2. The mechanism of the template synergistic effect was elucidated by the result of a second-order rate law through CO2 adsorption kinetic studies. Moreover, as predicted by the Langmuir adsorption model with n = 2 (two active adsorption sites for one CO2 molecule), the adsorption enthalpy was calculated as about −85 kJ·mol–1, a value which belonged to typical chemical adsorption. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202093h [article] Carbon dioxide capture by amine - impregnated mesocellular - foam - containing template [texte imprimé] / Yan, Wei, Auteur ; Jing Tang, Auteur ; Zijun Bian, Auteur . - 2012 . - pp. 3653–3662. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 9 (Mars 2012) . - pp. 3653–3662 Mots-clés : Silica  mesocellular  Dioxide Résumé : By impregnating polyethylenimine (PEI) into silica mesocellular foam with the template remaining (MCF(a)), a novel sorbent with both high CO2 adsorption capacity and high thermal stability was obtained. The remaining P123 template in the MCF played a great role in promoting the CO2 adsorption capacity, which could be 4.5 mmol·g–1 (adsorbent) when the amount of amine loading and the adsorption temperature were optimized as 60% and at 70 °C for the sample MCF(a)/PEI. Meanwhile, MCF(a)/PEI had a high thermal stability and selectivity, after 10 adsorption–desorption cycles, MCF(a)/PEI almost held a constant adsorption capacity; for different compositions of CO2 and N2 mixed gases, it always kept a high adsorption selectivity of CO2/N2. The mechanism of the template synergistic effect was elucidated by the result of a second-order rate law through CO2 adsorption kinetic studies. Moreover, as predicted by the Langmuir adsorption model with n = 2 (two active adsorption sites for one CO2 molecule), the adsorption enthalpy was calculated as about −85 kJ·mol–1, a value which belonged to typical chemical adsorption. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202093h

Energy saving of large-scale high-intensity-discharge lamp lighting networks using a central reactive power control system / Yan, Wei in IEEE transactions on industrial electronics, Vol. 56 N° 8 (Août 2009) 

Public ISBD [article]  in IEEE transactions on industrial electronics > Vol. 56 N° 8 (Août 2009) . - pp. 3069 - 3078 Titre : Energy saving of large-scale high-intensity-discharge lamp lighting networks using a central reactive power control system Type de document : texte imprimé Auteurs : Yan, Wei, Auteur ; Hui, S. Y. R., Auteur ; Chung, Henry Shu-Hung, Auteur Article en page(s) : pp. 3069 - 3078 Note générale : Génie électrique Langues : Anglais (eng) Mots-clés : Central  dimming  system  Reactive  power  control  site  Sustainable  lighting  technology Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper summarizes the test results on several large-scale lighting systems based on a range of high-intensity-discharge (HID) lamps. The study focuses on the energy-saving, energy-efficiency, and dimming characteristics of magnetic-ballast-driven HID lamp systems that are suitable for public lighting networks. A central energy-saving unit that can change the input mains voltage of 220 V to a variable voltage within the range from 220 to 170 V is used to control a large lighting network. This central dimming unit offers a new freedom for users to use lighting energy when and where it is needed and to an appropriate power level. Lamp characteristics under full and reduced voltage operation for six types of HID lamps have been measured. Six large-scaled networks of ballast-lamp sets have been set up and dimmed with a central energy-saving unit with a rated power of 13.2 kVA per phase. The full load current under test was set at about 40 A per phase. The loss of the energy-saving unit on a per-lamp-set basis was measured at different voltage levels. It is found that the energy-saving unit can reduce overall system power at least 40% without causing lamp flickering. Through the controllable voltage range, there is no obvious change in color temperature. The lamp power and light output decrease almost linearly with input voltage within the range from 170 to 220 V, and the power loss of the energy-saving unit is less than 2.4% of the full power in all tests. For these large-scaled lighting networks, it is envisaged that 25%-35% of energy saving can be achieved in large public lighting applications. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4926166 [article] Energy saving of large-scale high-intensity-discharge lamp lighting networks using a central reactive power control system [texte imprimé] / Yan, Wei, Auteur ; Hui, S. Y. R., Auteur ; Chung, Henry Shu-Hung, Auteur . - pp. 3069 - 3078. Génie électrique Langues : Anglais (eng) in IEEE transactions on industrial electronics > Vol. 56 N° 8 (Août 2009) . - pp. 3069 - 3078 Mots-clés : Central  dimming  system  Reactive  power  control  site  Sustainable  lighting  technology Index. décimale : 621.38 Dispositifs électroniques. Tubes à électrons. Photocellules. Accélérateurs de particules. Tubes à rayons X Résumé : This paper summarizes the test results on several large-scale lighting systems based on a range of high-intensity-discharge (HID) lamps. The study focuses on the energy-saving, energy-efficiency, and dimming characteristics of magnetic-ballast-driven HID lamp systems that are suitable for public lighting networks. A central energy-saving unit that can change the input mains voltage of 220 V to a variable voltage within the range from 220 to 170 V is used to control a large lighting network. This central dimming unit offers a new freedom for users to use lighting energy when and where it is needed and to an appropriate power level. Lamp characteristics under full and reduced voltage operation for six types of HID lamps have been measured. Six large-scaled networks of ballast-lamp sets have been set up and dimmed with a central energy-saving unit with a rated power of 13.2 kVA per phase. The full load current under test was set at about 40 A per phase. The loss of the energy-saving unit on a per-lamp-set basis was measured at different voltage levels. It is found that the energy-saving unit can reduce overall system power at least 40% without causing lamp flickering. Through the controllable voltage range, there is no obvious change in color temperature. The lamp power and light output decrease almost linearly with input voltage within the range from 170 to 220 V, and the power loss of the energy-saving unit is less than 2.4% of the full power in all tests. For these large-scaled lighting networks, it is envisaged that 25%-35% of energy saving can be achieved in large public lighting applications. DEWEY : 621.38 ISSN : 0278-0046 En ligne : http://ieeexplore.ieee.org/xpl/freeabs_all.jsp?arnumber=4926166

Low-pressure packed-bed gas-phase dehydration of glycerol to acrolein / Yan, Wei in Industrial & engineering chemistry research, Vol. 48 N° 7 (Avril 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3279–3283 Titre : Low-pressure packed-bed gas-phase dehydration of glycerol to acrolein Type de document : texte imprimé Auteurs : Yan, Wei, Auteur ; Galen J. Suppes, Auteur Année de publication : 2009 Article en page(s) : pp. 3279–3283 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Glycerol  Gas-phase  dehydration  Solid  acid  catalysts Résumé : Glycerol has become readily available from biodiesel industry. High functionality and relatively low price make it a potential building block to produce value-added derivatives such as acrolein. In this study, low-pressure packed-bed gas-phase dehydration of glycerol was investigated in presence of various solid acid catalysts, including H3PO4/activated carbon catalyst. Dehydration mechanism over H3PO4/activated carbon catalyst was validated. In the presence of H3PO4/activated carbon catalyst, yield of acroelin (66.8%) and selectivity to acrolein (84.0%) were achieved at the temperature of 260 °C and the pressure of 0.85 bar. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801200p [article] Low-pressure packed-bed gas-phase dehydration of glycerol to acrolein [texte imprimé] / Yan, Wei, Auteur ; Galen J. Suppes, Auteur . - 2009 . - pp. 3279–3283. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 7 (Avril 2009) . - pp. 3279–3283 Mots-clés : Glycerol  Gas-phase  dehydration  Solid  acid  catalysts Résumé : Glycerol has become readily available from biodiesel industry. High functionality and relatively low price make it a potential building block to produce value-added derivatives such as acrolein. In this study, low-pressure packed-bed gas-phase dehydration of glycerol was investigated in presence of various solid acid catalysts, including H3PO4/activated carbon catalyst. Dehydration mechanism over H3PO4/activated carbon catalyst was validated. In the presence of H3PO4/activated carbon catalyst, yield of acroelin (66.8%) and selectivity to acrolein (84.0%) were achieved at the temperature of 260 °C and the pressure of 0.85 bar. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801200p