Documents disponibles écrits par cet auteur

Characterization of solid acid catalysts and their reactivity in the glycolysis of poly(ethylene terephthalate) / Minli Zhu in Industrial & engineering chemistry research, Vol. 51 N° 36 (Septembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11659-11666 Titre : Characterization of solid acid catalysts and their reactivity in the glycolysis of poly(ethylene terephthalate) Type de document : texte imprimé Auteurs : Minli Zhu, Auteur ; Zengxi Li, Auteur ; Qian Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 11659-11666 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Chemical  reactivity  Acid  catalysis Résumé : Glycolysis of poly(ethylene terephthalate) with ethylene glycol was carried out with the catalysts of sulfated cobalt oxide (SO42―/Co3O4) and zinc-modified sulfated cobalt oxide (SO42―/Co―Zn―O). The catalysts prepared at different calcination temperatures have been characterized by various techniques. These techniques include X-ray diffraction, Raman spectrum, gas adsorption analysis, NH3-temperature programmed desorption, and IR spectroscopy of pyridine adsorption. The performances of these catalysts on the depolymerization of PET under mild conditions were studied, and relationships between the catalysts' textural properties, the surface acidity, and the catalytic activity have been investigated. The experimental results showed that the catalytic activity on glycolysis of PET was significantly improved by the catalysts of binary sulfur oxides of SO42―/Co―Zn―O. The conversion of PET obtained on SO42―/Co―Zn―O-300 °C was 96%, and the selectivity of BHET was 75%, after 3 h at 180 °C under atmospheric pressure. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350332 [article] Characterization of solid acid catalysts and their reactivity in the glycolysis of poly(ethylene terephthalate) [texte imprimé] / Minli Zhu, Auteur ; Zengxi Li, Auteur ; Qian Wang, Auteur . - 2012 . - pp. 11659-11666. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 36 (Septembre 2012) . - pp. 11659-11666 Mots-clés : Chemical  reactivity  Acid  catalysis Résumé : Glycolysis of poly(ethylene terephthalate) with ethylene glycol was carried out with the catalysts of sulfated cobalt oxide (SO42―/Co3O4) and zinc-modified sulfated cobalt oxide (SO42―/Co―Zn―O). The catalysts prepared at different calcination temperatures have been characterized by various techniques. These techniques include X-ray diffraction, Raman spectrum, gas adsorption analysis, NH3-temperature programmed desorption, and IR spectroscopy of pyridine adsorption. The performances of these catalysts on the depolymerization of PET under mild conditions were studied, and relationships between the catalysts' textural properties, the surface acidity, and the catalytic activity have been investigated. The experimental results showed that the catalytic activity on glycolysis of PET was significantly improved by the catalysts of binary sulfur oxides of SO42―/Co―Zn―O. The conversion of PET obtained on SO42―/Co―Zn―O-300 °C was 96%, and the selectivity of BHET was 75%, after 3 h at 180 °C under atmospheric pressure. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26350332

Integrated reliability-based seismic drift design optimization of base-isolated concrete buildings / Xiao-Kang Zou in Journal of structural engineering, Vol. 136 N° 10 (Octobre 2010) 

Public ISBD [article]  in Journal of structural engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1282-1295 Titre : Integrated reliability-based seismic drift design optimization of base-isolated concrete buildings Type de document : texte imprimé Auteurs : Xiao-Kang Zou, Auteur ; Qian Wang, Auteur ; Gang Li, Auteur Année de publication : 2011 Article en page(s) : pp. 1282-1295 Note générale : Génie Civil Langues : Anglais (eng) Mots-clés : Response  spectrum  analysis  Reliability  Structural  optimization  Optimality  criteria  method  Principle  of  virtual  work  Drift  design  Base  isolation  Earthquakes  Concrete  FORM  method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an effective numerical reliability-based optimization technique for the design of base-isolated concrete building structures under spectrum loading. Attempts have been made to automate the integrated spectrum analysis, reliability analysis, and design optimization procedure and to minimize the total cost of the base-isolated building subjected to multiple design performance criteria in terms of the story drift of the superstructure and lateral displacement of the isolation system or corresponding reliability constraints. In the optimal design formulation, the cost of the superstructure can be expressed in terms of concrete member sizes while assuming all these members to be linear elastic under a specified design earthquake. However, the base isolation is assumed to behave nonlinearly and its cost can be related to the effective horizontal stiffness of each isolator. Based on the principle of virtual work, the drift responses and corresponding reliability indexes can be explicitly formulated and the integrated optimization problem can be solved by an optimality criteria method. The technique is capable of achieving the optimal balance between the costs of the superstructure and isolation systems while the seismic drift performance or corresponding reliability of a building can be simultaneously considered. An illustrative example shows that conventional deterministic design optimization cannot ensure designs with satisfactory reliability levels, whereas the reliability-based design optimization can achieve the objective when uncertainties are considered. It is believed that such an optimization technique provides an effective tool for seismic design of building structures. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i10/p1282_s1?isAuthorized=no [article] Integrated reliability-based seismic drift design optimization of base-isolated concrete buildings [texte imprimé] / Xiao-Kang Zou, Auteur ; Qian Wang, Auteur ; Gang Li, Auteur . - 2011 . - pp. 1282-1295. Génie Civil Langues : Anglais (eng) in Journal of structural engineering > Vol. 136 N° 10 (Octobre 2010) . - pp. 1282-1295 Mots-clés : Response  spectrum  analysis  Reliability  Structural  optimization  Optimality  criteria  method  Principle  of  virtual  work  Drift  design  Base  isolation  Earthquakes  Concrete  FORM  method Index. décimale : 624 Constructions du génie civil et du bâtiment. Infrastructures. Ouvrages en terres. Fondations. Tunnels. Ponts et charpentes Résumé : This paper presents an effective numerical reliability-based optimization technique for the design of base-isolated concrete building structures under spectrum loading. Attempts have been made to automate the integrated spectrum analysis, reliability analysis, and design optimization procedure and to minimize the total cost of the base-isolated building subjected to multiple design performance criteria in terms of the story drift of the superstructure and lateral displacement of the isolation system or corresponding reliability constraints. In the optimal design formulation, the cost of the superstructure can be expressed in terms of concrete member sizes while assuming all these members to be linear elastic under a specified design earthquake. However, the base isolation is assumed to behave nonlinearly and its cost can be related to the effective horizontal stiffness of each isolator. Based on the principle of virtual work, the drift responses and corresponding reliability indexes can be explicitly formulated and the integrated optimization problem can be solved by an optimality criteria method. The technique is capable of achieving the optimal balance between the costs of the superstructure and isolation systems while the seismic drift performance or corresponding reliability of a building can be simultaneously considered. An illustrative example shows that conventional deterministic design optimization cannot ensure designs with satisfactory reliability levels, whereas the reliability-based design optimization can achieve the objective when uncertainties are considered. It is believed that such an optimization technique provides an effective tool for seismic design of building structures. DEWEY : 624.17 ISSN : 0733-9445 En ligne : http://ascelibrary.org/sto/resource/1/jsendh/v136/i10/p1282_s1?isAuthorized=no

Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization / Yaoshun Wen in Industrial & engineering chemistry research, Vol. 51 N° 10 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3939–3950 Titre : Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization Type de document : texte imprimé Auteurs : Yaoshun Wen, Auteur ; Gang Wang, Auteur ; Qian Wang, Auteur Année de publication : 2012 Article en page(s) : pp. 3939–3950 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Kinetics  Adsorbent  Desulfurization Résumé : Regeneration experiments on Ni/ZnO–SiO2–Al2O3 adsorbents for gasoline reactive adsorption desulfurization (RADS) were carried out in a fixed-bed microreactor at atmosphere pressure. X-ray diffraction, scanning electron microscopy/energy-dispersive spectroscopy, X-ray photoelectron spectrometry, and N2 isotherms were used to identify changes in the physical and chemical properties of the adsorbent before and after regeneration. The results showed that high O2 concentrations significantly increase the regeneration rate of the adsorbent but yield zinc sulfate. A regeneration condition that decreases the formation of zinc sulfate, including low O2 concentration with high temperature, was then investigated. Finally, a shrinking core model (SCM) was applied to account for the regeneration kinetics of the Ni/ZnO–SiO2–Al2O3 adsorbent, and the relevant kinetic parameters were determined. The regeneration is controlled first by a chemical reaction and then by layer diffusion. The desulfurization activity of the regenerated adsorbent over three desulfurization and regeneration cycles is almost identical to that of fresh adsorbent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202730w [article] Regeneration characteristics and kinetics of Ni / ZnO – SiO2 – A l2O3 adsorbent for reactive adsorption desulfurization [texte imprimé] / Yaoshun Wen, Auteur ; Gang Wang, Auteur ; Qian Wang, Auteur . - 2012 . - pp. 3939–3950. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 10 (Mars 2012) . - pp. 3939–3950 Mots-clés : Kinetics  Adsorbent  Desulfurization Résumé : Regeneration experiments on Ni/ZnO–SiO2–Al2O3 adsorbents for gasoline reactive adsorption desulfurization (RADS) were carried out in a fixed-bed microreactor at atmosphere pressure. X-ray diffraction, scanning electron microscopy/energy-dispersive spectroscopy, X-ray photoelectron spectrometry, and N2 isotherms were used to identify changes in the physical and chemical properties of the adsorbent before and after regeneration. The results showed that high O2 concentrations significantly increase the regeneration rate of the adsorbent but yield zinc sulfate. A regeneration condition that decreases the formation of zinc sulfate, including low O2 concentration with high temperature, was then investigated. Finally, a shrinking core model (SCM) was applied to account for the regeneration kinetics of the Ni/ZnO–SiO2–Al2O3 adsorbent, and the relevant kinetic parameters were determined. The regeneration is controlled first by a chemical reaction and then by layer diffusion. The desulfurization activity of the regenerated adsorbent over three desulfurization and regeneration cycles is almost identical to that of fresh adsorbent. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202730w