Documents disponibles écrits par cet auteur

Breakthrough characteristics of reformate desulfurization using ZnO sorbents for logistic fuel cell power systems / HongYun Yang ; Ryan Sothen ; Donald R. Cahela in Industrial & engineering chemistry research, Vol. 47 n°24 (Décembre 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p.10064–10070 Titre : Breakthrough characteristics of reformate desulfurization using ZnO sorbents for logistic fuel cell power systems Type de document : texte imprimé Auteurs : HongYun Yang, Auteur ; Ryan Sothen, Auteur ; Donald R. Cahela, Auteur Année de publication : 2009 Article en page(s) : p.10064–10070 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Reformate  Desulfurization  ZnO Résumé : Sulfur breakthrough behaviors during reformate desulfurization were investigated using a novel ZnO-based sorbent with minimized mass transfer resistance. The presence of CO, CO2, or water affected the breakthrough characteristics of H2S and carbonyl sulfide (COS). CO and CO2 did not significantly affect the reaction between H2S and ZnO, but they reacted with H2S to form COS, which cannot be efficiently removed by ZnO. The mechanisms of COS formation via two different pathways were also investigated. CO reacted with H2S to form COS homogeneously; CO2 reacted with H2S heterogeneously on the sulfide surface. COS formation by CO and CO2 was suppressed by H2 and water. Water also severely hindered the reaction between ZnO and H2S and significantly decreased H2S breakthrough time. At low water concentrations, sulfur breakthrough was determined by the homogeneous COS formation; at high water concentrations, it was controlled by H2S breakthrough. Capacity loss due to COS formation and adsorption of water was also observed. Novel sorbent and process designs are required to improve the desulfurization performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8008617 [article] Breakthrough characteristics of reformate desulfurization using ZnO sorbents for logistic fuel cell power systems [texte imprimé] / HongYun Yang, Auteur ; Ryan Sothen, Auteur ; Donald R. Cahela, Auteur . - 2009 . - p.10064–10070. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 n°24 (Décembre 2008) . - p.10064–10070 Mots-clés : Reformate  Desulfurization  ZnO Résumé : Sulfur breakthrough behaviors during reformate desulfurization were investigated using a novel ZnO-based sorbent with minimized mass transfer resistance. The presence of CO, CO2, or water affected the breakthrough characteristics of H2S and carbonyl sulfide (COS). CO and CO2 did not significantly affect the reaction between H2S and ZnO, but they reacted with H2S to form COS, which cannot be efficiently removed by ZnO. The mechanisms of COS formation via two different pathways were also investigated. CO reacted with H2S to form COS homogeneously; CO2 reacted with H2S heterogeneously on the sulfide surface. COS formation by CO and CO2 was suppressed by H2 and water. Water also severely hindered the reaction between ZnO and H2S and significantly decreased H2S breakthrough time. At low water concentrations, sulfur breakthrough was determined by the homogeneous COS formation; at high water concentrations, it was controlled by H2S breakthrough. Capacity loss due to COS formation and adsorption of water was also observed. Novel sorbent and process designs are required to improve the desulfurization performance. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie8008617

Structural and optical properties of encapsulated ZnO in porous host matrix / Noppadon Sathitsuksanoh in Acta materialia, Vol. 58 N° 2 (Janvier 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 373-378 Titre : Structural and optical properties of encapsulated ZnO in porous host matrix Type de document : texte imprimé Auteurs : Noppadon Sathitsuksanoh, Auteur ; Dake Wang, Auteur ; HongYun Yang, Auteur Article en page(s) : pp. 373-378 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : ZnO  Nanoparticles  Impregnation  Raman  Photoluminescence Index. décimale : 669 Métallurgie Résumé : ZnO nanoparticles were encapsulated in the porous activated carbon matrix by incipient-wetness impregnation. The use of the small host matrix allowed the size confinement of ZnO by utilizing the porous nature of the host matrix. Partial fixation of ZnO in the porous matrix determines the size and the dispersion of the particles. Experiments at different calcination temperatures were carried out to investigate structural and optical properties of ZnO nanoparticles in the porous activated carbon matrix using X-ray diffraction, scanning electron microscopy, Raman spectroscopy and photoluminescence. The optimal calcination temperature was found to be not, vert, similar450 °C in order to confine ZnO nanoparticles in the porous ACP matrix. Near-band-edge UV emission and green emission were both associated with the deep-level defect state. A decrease in full width at half maximum of E2 mode in Raman spectrum confirmed an increase in crystallite size due to higher calcination temperature, causing an increase in phonon lifetime. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...] [article] Structural and optical properties of encapsulated ZnO in porous host matrix [texte imprimé] / Noppadon Sathitsuksanoh, Auteur ; Dake Wang, Auteur ; HongYun Yang, Auteur . - pp. 373-378. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 2 (Janvier 2010) . - pp. 373-378 Mots-clés : ZnO  Nanoparticles  Impregnation  Raman  Photoluminescence Index. décimale : 669 Métallurgie Résumé : ZnO nanoparticles were encapsulated in the porous activated carbon matrix by incipient-wetness impregnation. The use of the small host matrix allowed the size confinement of ZnO by utilizing the porous nature of the host matrix. Partial fixation of ZnO in the porous matrix determines the size and the dispersion of the particles. Experiments at different calcination temperatures were carried out to investigate structural and optical properties of ZnO nanoparticles in the porous activated carbon matrix using X-ray diffraction, scanning electron microscopy, Raman spectroscopy and photoluminescence. The optimal calcination temperature was found to be not, vert, similar450 °C in order to confine ZnO nanoparticles in the porous ACP matrix. Near-band-edge UV emission and green emission were both associated with the deep-level defect state. A decrease in full width at half maximum of E2 mode in Raman spectrum confirmed an increase in crystallite size due to higher calcination temperature, causing an increase in phonon lifetime. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science?_ob=PublicationURL&_tockey=%23TOC%235556%23 [...]