Documents disponibles écrits par cet auteur

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 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) 

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

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) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7941-7948 Titre : Partial oxidation of methane and oxygen permeation in SrCoFeOx membrane reactor with different catalysts Type de document : texte imprimé Auteurs : Jay Kniep, Auteur ; Y. S. Lin, Auteur Année de publication : 2011 Article en page(s) : pp. 7941-7948 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Catalyst  Membrane  reactor  Permeation  Partial  oxidation Résumé : Partial oxidation of methane (CH4) and oxygen permeation in a dense SrCoFeOx disk membrane reactor were studied with the reducing side of the membrane packed with different catalysts (catalyst support γ-Al2O3, La0.6Sr0.4Co0.8Fe0.2O3-δ, and 10 wt % Ni/γ-Al2O3) of increasing reaction activities for CH4 oxidation. The influence of temperature, flow rates, and inlet CH4 concentration (diluted with helium) on the performance of the different membrane reactors was investigated. The oxygen permeation flux and CH4 conversion increased in the following order: γ-Al2O3 < La0.6Sr0.4Co0.8Fe0.2O3-δ < 10% Ni/γ-Al2O3. The membrane reactor with the reforming catalyst of 10 wt % Ni/γ-Al2O3 had the highest CH4 conversion (~90%), CO selectivity (97%), and oxygen permeation flux (2.40 mL/(cm2 min)) at 900 °C. The improvement of the oxygen permeation through the membranes with different catalysts emphasizes the effect of the CH4 oxidation reaction rate on the reducing side of the membrane on the oxygen permeation flux through the mixed-conducting ceramic membranes. Under identical conditions, the oxygen permeation flux through mixed-conducting ceramic membrane with a reducing gas is a strong function ofthe catalytic activity for the oxidation of the reducing gas. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332118 [article] Partial oxidation of methane and oxygen permeation in SrCoFeOx membrane reactor with different catalysts [texte imprimé] / Jay Kniep, Auteur ; Y. S. Lin, Auteur . - 2011 . - pp. 7941-7948. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 13 (Juillet 2011) . - pp. 7941-7948 Mots-clés : Catalyst  Membrane  reactor  Permeation  Partial  oxidation Résumé : Partial oxidation of methane (CH4) and oxygen permeation in a dense SrCoFeOx disk membrane reactor were studied with the reducing side of the membrane packed with different catalysts (catalyst support γ-Al2O3, La0.6Sr0.4Co0.8Fe0.2O3-δ, and 10 wt % Ni/γ-Al2O3) of increasing reaction activities for CH4 oxidation. The influence of temperature, flow rates, and inlet CH4 concentration (diluted with helium) on the performance of the different membrane reactors was investigated. The oxygen permeation flux and CH4 conversion increased in the following order: γ-Al2O3 < La0.6Sr0.4Co0.8Fe0.2O3-δ < 10% Ni/γ-Al2O3. The membrane reactor with the reforming catalyst of 10 wt % Ni/γ-Al2O3 had the highest CH4 conversion (~90%), CO selectivity (97%), and oxygen permeation flux (2.40 mL/(cm2 min)) at 900 °C. The improvement of the oxygen permeation through the membranes with different catalysts emphasizes the effect of the CH4 oxidation reaction rate on the reducing side of the membrane on the oxygen permeation flux through the mixed-conducting ceramic membranes. Under identical conditions, the oxygen permeation flux through mixed-conducting ceramic membrane with a reducing gas is a strong function ofthe catalytic activity for the oxidation of the reducing gas. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24332118