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Dehydrogenation of methylcyclohexane to produce high - purity hydrogen using membrane reactors with amorphous silica membranes / Kazunori Oda in Industrial & engineering chemistry research, Vol. 49 N° 22 (Novembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11287-11293 Titre : Dehydrogenation of methylcyclohexane to produce high - purity hydrogen using membrane reactors with amorphous silica membranes Type de document : texte imprimé Auteurs : Kazunori Oda, Auteur ; Kazuki Akamatsu, Auteur ; Takashi Sugawara, Auteur Année de publication : 2011 Article en page(s) : pp. 11287-11293 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Membrane  reactor  High  purity  Dehydrogenation Résumé : We developed a membrane reactor that can produce high-purity hydrogen in one step from methylcyclohexane. This membrane reactor combined a hydrogen-selective amorphous silica membrane prepared with dimethoxy-diphenylsilane and oxygen and employing counter-diffusion chemical vapor deposition, and Pt/Al2O3 catalyst. The silica membrane showed excellent hydrogen permeance at 573 K of the order of 10-5 mol m-2 s-1Pa-1 and high hydrogen/sulfur hexafluoride permselectivity of around 104. The membrane reactor exhibited equilibrium shifts as expected under reaction temperatures ranging from 473 to 553 K and reaction pressures ranging from 0.1 to 0.25 MPa, and these performances were successfully predicted using a simulation model, which was also developed in this study. Finally, we demonstrated that hydrogen with purity as high as 99.95% was produced from methylcyclohexane in the membrane reactor without using carrier gas or sweep gas. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101210x [article] Dehydrogenation of methylcyclohexane to produce high - purity hydrogen using membrane reactors with amorphous silica membranes [texte imprimé] / Kazunori Oda, Auteur ; Kazuki Akamatsu, Auteur ; Takashi Sugawara, Auteur . - 2011 . - pp. 11287-11293. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 22 (Novembre 2010) . - pp. 11287-11293 Mots-clés : Membrane  reactor  High  purity  Dehydrogenation Résumé : We developed a membrane reactor that can produce high-purity hydrogen in one step from methylcyclohexane. This membrane reactor combined a hydrogen-selective amorphous silica membrane prepared with dimethoxy-diphenylsilane and oxygen and employing counter-diffusion chemical vapor deposition, and Pt/Al2O3 catalyst. The silica membrane showed excellent hydrogen permeance at 573 K of the order of 10-5 mol m-2 s-1Pa-1 and high hydrogen/sulfur hexafluoride permselectivity of around 104. The membrane reactor exhibited equilibrium shifts as expected under reaction temperatures ranging from 473 to 553 K and reaction pressures ranging from 0.1 to 0.25 MPa, and these performances were successfully predicted using a simulation model, which was also developed in this study. Finally, we demonstrated that hydrogen with purity as high as 99.95% was produced from methylcyclohexane in the membrane reactor without using carrier gas or sweep gas. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101210x

Three preparation methods for monodispersed chitosan microspheres using the shirasu porous glass membrane emulsification technique and mechanisms of microsphere formation / Kazuki Akamatsu in Industrial & engineering chemistry research, Vol. 49 N° 7 (Avril 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3236–3241 Titre : Three preparation methods for monodispersed chitosan microspheres using the shirasu porous glass membrane emulsification technique and mechanisms of microsphere formation Type de document : texte imprimé Auteurs : Kazuki Akamatsu, Auteur ; Daisaku Kaneko, Auteur ; Takashi Sugawara, Auteur Année de publication : 2010 Article en page(s) : pp. 3236–3241 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Monodispersed  Chitosan  Microspheres  Shirasu  Porous  Glass  Membrane  Emulsification  Mechanisms  Microsphere Résumé : The Shirasu porous glass (SPG) membrane emulsification technique was employed for the preparation of monodispersed chitosan microspheres with the diameter controlled to be in the range from submicrometers to 10 μm. Three preparation methods were used in this study: (1) a cross-linking method with glutaraldehyde, (2) an interaction method with alginate, and (3) a drying-in-liquid method with aqueous sodium hydroxide medium. In every preparation method, various SPG membranes with different pore sizes were used for microsphere formation, and the fabrication mechanism for the microspheres was elucidated. It was successfully shown from these detailed investigations that the average diameters of the chitosan microspheres were controlled in the range of submicrometer to 10 μm by the pore sizes of the SPG membranes for preparing chitosan emulsions by method 1, alginate emulsions by method 2, or chitosan emulsions by method 3. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901821s [article] Three preparation methods for monodispersed chitosan microspheres using the shirasu porous glass membrane emulsification technique and mechanisms of microsphere formation [texte imprimé] / Kazuki Akamatsu, Auteur ; Daisaku Kaneko, Auteur ; Takashi Sugawara, Auteur . - 2010 . - pp. 3236–3241. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 7 (Avril 2010) . - pp. 3236–3241 Mots-clés : Monodispersed  Chitosan  Microspheres  Shirasu  Porous  Glass  Membrane  Emulsification  Mechanisms  Microsphere Résumé : The Shirasu porous glass (SPG) membrane emulsification technique was employed for the preparation of monodispersed chitosan microspheres with the diameter controlled to be in the range from submicrometers to 10 μm. Three preparation methods were used in this study: (1) a cross-linking method with glutaraldehyde, (2) an interaction method with alginate, and (3) a drying-in-liquid method with aqueous sodium hydroxide medium. In every preparation method, various SPG membranes with different pore sizes were used for microsphere formation, and the fabrication mechanism for the microspheres was elucidated. It was successfully shown from these detailed investigations that the average diameters of the chitosan microspheres were controlled in the range of submicrometer to 10 μm by the pore sizes of the SPG membranes for preparing chitosan emulsions by method 1, alginate emulsions by method 2, or chitosan emulsions by method 3. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901821s