Documents disponibles écrits par cet auteur

Adsorption and diffusion of carbon dioxide on metal−organic framework (MOF-5) / Zhenxia Zhao in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10015–10020 Titre : Adsorption and diffusion of carbon dioxide on metal−organic framework (MOF-5) Type de document : texte imprimé Auteurs : Zhenxia Zhao, Auteur ; Zhong Li, Auteur ; Y. S. Lin, Auteur Année de publication : 2010 Article en page(s) : pp. 10015–10020 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Microporous  metal−organic  framework  Adsorption  equilibrium  Diffusion Résumé : Adsorption equilibrium and diffusion of CO2 on microporous metal−organic frameworks (MOF-5, or IRMOF-1) crystals were experimentally studied by the gravimetric method in the pressure range up to 1 atm. The MOF-5 crystal cubes of about 40−60 μm in sizes were synthesized by the solvothermal method. Freundlich adsorption isotherm equation can fit well CO2 adsorption isotherms on MOF-5, with isosteric heat of adsorption of about 34 kJ/mol. Diffusion coefficient of CO2 in the MOF-5 is in the range of 8.1−11.5 × 10−9 cm2/s in 295−331K with activation energy of 7.61 kJ/mol. MOF-5 offers attractive adsorption properties as an adsorbent for separation of CO2 from flue gas. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900665f [article] Adsorption and diffusion of carbon dioxide on metal−organic framework (MOF-5) [texte imprimé] / Zhenxia Zhao, Auteur ; Zhong Li, Auteur ; Y. S. Lin, Auteur . - 2010 . - pp. 10015–10020. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 10015–10020 Mots-clés : Microporous  metal−organic  framework  Adsorption  equilibrium  Diffusion Résumé : Adsorption equilibrium and diffusion of CO2 on microporous metal−organic frameworks (MOF-5, or IRMOF-1) crystals were experimentally studied by the gravimetric method in the pressure range up to 1 atm. The MOF-5 crystal cubes of about 40−60 μm in sizes were synthesized by the solvothermal method. Freundlich adsorption isotherm equation can fit well CO2 adsorption isotherms on MOF-5, with isosteric heat of adsorption of about 34 kJ/mol. Diffusion coefficient of CO2 in the MOF-5 is in the range of 8.1−11.5 × 10−9 cm2/s in 295−331K with activation energy of 7.61 kJ/mol. MOF-5 offers attractive adsorption properties as an adsorbent for separation of CO2 from flue gas. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900665f

Autothermal reforming of methane in a proton - conducting ceramic membrane reactor / Jay Kniep in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12426–12432 Titre : Autothermal reforming of methane in a proton - conducting ceramic membrane reactor Type de document : texte imprimé Auteurs : Jay Kniep, Auteur ; Matthew Anderson, Auteur ; Y. S. Lin, Auteur Année de publication : 2012 Article en page(s) : pp. 12426–12432 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Membrane  reactor  Ceramic  materials  Inorganic  membrane  Autothermic  reactor  Reforming Résumé : Endothermic steam reforming of methane for hydrogen production requires heat input with selective oxidation of methane. Dense SrCe0.75Zr0.20Tm0.05O3-δ perovskite membranes were combined with a reforming catalyst to demonstrate the feasibility of a heat-exchange membrane reactor for steam reforming of methane coupled with selective oxidation of permeated hydrogen. The reforming catalyst used was a prereduced nickel based catalyst supported on γ-Al2O3. Hydrogen produced via the steam reforming of methane or water gas shift reaction was able to diffuse through the catalyst bed and transport through the membrane. The permeated hydrogen reacted with oxygen (from air) to produce heat for the steam reforming of methane on the other side of the membrane. The membrane reactor avoids the use of an expensive air separation unit to produce pure oxygen. The influence of experimental conditions, such as temperature, gas hourly space velocity, and the steam to carbon (S/C) ratio, on the membrane reactor was investigated. SrCe0.75Zr0.20Tm0.05O3-δ showed good chemical stability in steam reforming conditions as X-ray diffraction analysis of the membrane surface exposed to steam-reforming conditions for 425 h showed only minor CeO2 formation. The experimental data demonstrate the feasibility of using a proton conducting ceramic membrane in the heat-exchange membrane reactor for steam reforming of methane coupled with selective oxidation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745715 [article] Autothermal reforming of methane in a proton - conducting ceramic membrane reactor [texte imprimé] / Jay Kniep, Auteur ; Matthew Anderson, Auteur ; Y. S. Lin, Auteur . - 2012 . - pp. 12426–12432. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12426–12432 Mots-clés : Membrane  reactor  Ceramic  materials  Inorganic  membrane  Autothermic  reactor  Reforming Résumé : Endothermic steam reforming of methane for hydrogen production requires heat input with selective oxidation of methane. Dense SrCe0.75Zr0.20Tm0.05O3-δ perovskite membranes were combined with a reforming catalyst to demonstrate the feasibility of a heat-exchange membrane reactor for steam reforming of methane coupled with selective oxidation of permeated hydrogen. The reforming catalyst used was a prereduced nickel based catalyst supported on γ-Al2O3. Hydrogen produced via the steam reforming of methane or water gas shift reaction was able to diffuse through the catalyst bed and transport through the membrane. The permeated hydrogen reacted with oxygen (from air) to produce heat for the steam reforming of methane on the other side of the membrane. The membrane reactor avoids the use of an expensive air separation unit to produce pure oxygen. The influence of experimental conditions, such as temperature, gas hourly space velocity, and the steam to carbon (S/C) ratio, on the membrane reactor was investigated. SrCe0.75Zr0.20Tm0.05O3-δ showed good chemical stability in steam reforming conditions as X-ray diffraction analysis of the membrane surface exposed to steam-reforming conditions for 425 h showed only minor CeO2 formation. The experimental data demonstrate the feasibility of using a proton conducting ceramic membrane in the heat-exchange membrane reactor for steam reforming of methane coupled with selective oxidation. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745715

Effect of isomorphous metal substitution in zeolite framework on pervaporation xylene-separation performance of MFI-type zeolite membranes / O’Brien-Abraham, Jessica in Industrial & engineering chemistry research, Vol. 49 N° 2 (Janvier 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 809–816 Titre : Effect of isomorphous metal substitution in zeolite framework on pervaporation xylene-separation performance of MFI-type zeolite membranes Type de document : texte imprimé Auteurs : O’Brien-Abraham, Jessica, Auteur ; Y. S. Lin, Auteur Année de publication : 2010 Article en page(s) : pp 809–816 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Isomorphous  Metal  Zeolite  membranes. Résumé : MFI-type zeolite membranes have shown good selectivity for separation of p-xylene from its isomers. The major problem with the MFI-type zeolite membrane is that the MFI-type zeolite framework loses its size/shape selectivity under high loadings of p-xylene because of the significant framework distortion experienced by the pore structure and as a result observed high selectivities are not stable over time. This paper proposes changing the interaction of the xylene isomers with MFI-type framework to address this problem. MFI-type zeolite membranes with aluminum and boron isomorphously substituted into the framework were synthesized and subjected to multicomponent xylene separation via pervaporation. It is found that by performing this substitution, slight changes to both surface chemistry and framework flexibility can be introduced. Essentially, the interaction of the xylene molecules with the MFI structure is modified to limit p-xylene loading, as well as diffusion pathway access to o-xylene. As a result improvement in xylene separation performance over silicalite was observed. The boron-substituted membranes demonstrated the highest selectivities for p-xylene under a wide range of feed compositions; the highest selectivity observed was 55 (feed, 5% p-xylene; 95% o-xylene). This is higher than any previously reported xylene separation selectivity for pervaporation through MFI-type zeolite membranes. However, the performance stability of substituted membranes over time was also investigated, and it was found that, over a period of 96 h, a reduction in selectivity of about an order of magnitude was observed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900926t [article] Effect of isomorphous metal substitution in zeolite framework on pervaporation xylene-separation performance of MFI-type zeolite membranes [texte imprimé] / O’Brien-Abraham, Jessica, Auteur ; Y. S. Lin, Auteur . - 2010 . - pp 809–816. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 2 (Janvier 2010) . - pp 809–816 Mots-clés : Isomorphous  Metal  Zeolite  membranes. Résumé : MFI-type zeolite membranes have shown good selectivity for separation of p-xylene from its isomers. The major problem with the MFI-type zeolite membrane is that the MFI-type zeolite framework loses its size/shape selectivity under high loadings of p-xylene because of the significant framework distortion experienced by the pore structure and as a result observed high selectivities are not stable over time. This paper proposes changing the interaction of the xylene isomers with MFI-type framework to address this problem. MFI-type zeolite membranes with aluminum and boron isomorphously substituted into the framework were synthesized and subjected to multicomponent xylene separation via pervaporation. It is found that by performing this substitution, slight changes to both surface chemistry and framework flexibility can be introduced. Essentially, the interaction of the xylene molecules with the MFI structure is modified to limit p-xylene loading, as well as diffusion pathway access to o-xylene. As a result improvement in xylene separation performance over silicalite was observed. The boron-substituted membranes demonstrated the highest selectivities for p-xylene under a wide range of feed compositions; the highest selectivity observed was 55 (feed, 5% p-xylene; 95% o-xylene). This is higher than any previously reported xylene separation selectivity for pervaporation through MFI-type zeolite membranes. However, the performance stability of substituted membranes over time was also investigated, and it was found that, over a period of 96 h, a reduction in selectivity of about an order of magnitude was observed. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900926t

Effect of the membrane quality on gas permeation and chemical vapor deposition modification of MFI - type zeolite membranes / Xuefeng Zhu in Industrial & engineering chemistry research, Vol. 49 N° 20 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10026–10033 Titre : Effect of the membrane quality on gas permeation and chemical vapor deposition modification of MFI - type zeolite membranes Type de document : texte imprimé Auteurs : Xuefeng Zhu, Auteur ; Haibing Wang, Auteur ; Y. S. Lin, Auteur Année de publication : 2011 Article en page(s) : pp. 10026–10033 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Gas  Chemical  vapor  Zeolite Résumé : Chemical vapor deposition (CVD) with methyldiethoxysilane (MDES) for MFI zeolitic pore size reduction is an effective way to improve the H2/CO2 separation factor of zeolite membranes. However, only good membranes with few intercrystalline defects are able to show considerable improvement in H2/CO2 separation factor through CVD modification. It is unreliable to evaluate the membrane quality on the basis of the H2/SF6 or N2/SF6 ideal separation factor because the SF6 adsorption-induced crystal swelling causes shrinkage of the intercrystalline defects in the MFI zeolite membranes. In this study, the quality of MFI zeolite membranes was evaluated on the basis of their performance in separating equimolar H2/CO2 mixture gas at room temperature. High-quality membranes are more selective to CO2 molecules rather than H2 at room temperature due to the adsorption of CO2 into the zeolitic pores and blocking of the pore channels for H2 diffusion. The effectiveness of the quality evaluation method was confirmed by on-stream CVD modification of MFI zeolite membranes with different initial H2/CO2 separation factors/ideal separation factors at room temperature. Experimental results showed that only those membranes with low H2/CO2 separation factor at room temperature (good membranes) showed improvement in H2/CO2 separation factor through CVD modification. For the CVD modified zeolite membrane with good initial quality, the permeance of H2 is lower than that of He with an activated diffusion behavior for small gas molecules in the modified zeolitic pores. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101101z [article] Effect of the membrane quality on gas permeation and chemical vapor deposition modification of MFI - type zeolite membranes [texte imprimé] / Xuefeng Zhu, Auteur ; Haibing Wang, Auteur ; Y. S. Lin, Auteur . - 2011 . - pp. 10026–10033. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 20 (Octobre 2010) . - pp. 10026–10033 Mots-clés : Gas  Chemical  vapor  Zeolite Résumé : Chemical vapor deposition (CVD) with methyldiethoxysilane (MDES) for MFI zeolitic pore size reduction is an effective way to improve the H2/CO2 separation factor of zeolite membranes. However, only good membranes with few intercrystalline defects are able to show considerable improvement in H2/CO2 separation factor through CVD modification. It is unreliable to evaluate the membrane quality on the basis of the H2/SF6 or N2/SF6 ideal separation factor because the SF6 adsorption-induced crystal swelling causes shrinkage of the intercrystalline defects in the MFI zeolite membranes. In this study, the quality of MFI zeolite membranes was evaluated on the basis of their performance in separating equimolar H2/CO2 mixture gas at room temperature. High-quality membranes are more selective to CO2 molecules rather than H2 at room temperature due to the adsorption of CO2 into the zeolitic pores and blocking of the pore channels for H2 diffusion. The effectiveness of the quality evaluation method was confirmed by on-stream CVD modification of MFI zeolite membranes with different initial H2/CO2 separation factors/ideal separation factors at room temperature. Experimental results showed that only those membranes with low H2/CO2 separation factor at room temperature (good membranes) showed improvement in H2/CO2 separation factor through CVD modification. For the CVD modified zeolite membrane with good initial quality, the permeance of H2 is lower than that of He with an activated diffusion behavior for small gas molecules in the modified zeolitic pores. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101101z

Effect of zirconium doping on hydrogen permeation through strontium cerate membranes / Jay Kniep in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2768–2774 Titre : Effect of zirconium doping on hydrogen permeation through strontium cerate membranes Type de document : texte imprimé Auteurs : Jay Kniep, Auteur ; Y. S. Lin, Auteur Année de publication : 2010 Article en page(s) : pp. 2768–2774 Note générale : Industrial Chemistry Langues : Anglais (eng) Mots-clés : Zirconium;  Doping;  Hydrogen;  Permeation;  Strontium;  Cerate;  Membranes Résumé : SrCe0.95Tm0.05O3−δ perovskite-type ceramic membranes offer high hydrogen selectivity, thermal stability, mixed protonic−electronic conductivity, and mechanical strength at temperatures above 600 °C. However, in order for the SrCeO3-based membranes to be used in industrial applications, the chemical stability of the membranes in various environments must be improved. The effect of doping zirconium on the chemical stability, lattice structure, protonic and electronic conductivity, and hydrogen permeation properties of SrCe0.95−xZrxTm0.05O3−δ (0 ≤ x ≤ 0.40) was studied. X-ray diffraction analysis verifies that all samples consist of a single perovskite phase. Doping zirconium in SrCe0.95Tm0.05O3−δ results in a decrease in both the protonic and electronic conductivity of the materials under reducing conditions, and a more significant decrease in hydrogen permeability of the membrane in CO2 free gas streams. In a CO2-containing environment SrCe0.75Zr0.20Tm0.05O3−δ membranes have a larger steady-state H2 flux and superior chemical stability over SrCe0.95Tm0.05O3−δ membranes. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9015182 [article] Effect of zirconium doping on hydrogen permeation through strontium cerate membranes [texte imprimé] / Jay Kniep, Auteur ; Y. S. Lin, Auteur . - 2010 . - pp. 2768–2774. Industrial Chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 6 (Mars 2010) . - pp. 2768–2774 Mots-clés : Zirconium;  Doping;  Hydrogen;  Permeation;  Strontium;  Cerate;  Membranes Résumé : SrCe0.95Tm0.05O3−δ perovskite-type ceramic membranes offer high hydrogen selectivity, thermal stability, mixed protonic−electronic conductivity, and mechanical strength at temperatures above 600 °C. However, in order for the SrCeO3-based membranes to be used in industrial applications, the chemical stability of the membranes in various environments must be improved. The effect of doping zirconium on the chemical stability, lattice structure, protonic and electronic conductivity, and hydrogen permeation properties of SrCe0.95−xZrxTm0.05O3−δ (0 ≤ x ≤ 0.40) was studied. X-ray diffraction analysis verifies that all samples consist of a single perovskite phase. Doping zirconium in SrCe0.95Tm0.05O3−δ results in a decrease in both the protonic and electronic conductivity of the materials under reducing conditions, and a more significant decrease in hydrogen permeability of the membrane in CO2 free gas streams. In a CO2-containing environment SrCe0.75Zr0.20Tm0.05O3−δ membranes have a larger steady-state H2 flux and superior chemical stability over SrCe0.95Tm0.05O3−δ membranes. Note de contenu : Bibiogr. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9015182

Effect of zirconium doping on hydrogen permeation through strontium cerate membranes / Jay Kniep in Industrial & engineering chemistry research, Vol. 49 N° 6 (Mars 2010) 

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Partial oxidation of methane and oxygen permeation in SrCoFeOx membrane reactor with different catalysts / Jay Kniep in Industrial & engineering chemistry research, Vol. 50 N° 13 (Juillet 2011) 

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Transient oxygen permeation and surface catalytic properties of lanthanum cobaltite membrane under oxygen–methane gradient / Tyler T. Norton in Industrial & engineering chemistry research, Vol. 51 N° 39 (Octobre 2012) 

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