CO2 - Tolerant oxygen - permeable Fe2O3 - Ce0.9Gd0.1O2 - δ dual phase membranes / Huixia Luo in Industrial & engineering chemistry research, Vol. 50 N° 23 (Décembre 2011)  

Public ISBD [article]  inIndustrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13508–13517 Titre : CO2 - Tolerant oxygen - permeable Fe2O3 - Ce0.9Gd0.1O2 - δ dual phase membranes Type de document : texte imprimé Auteurs : Huixia Luo, Auteur ; Heqing Jiang, Auteur ; Konstantin Efimov, Auteur Année de publication : 2012 Article en page(s) : pp. 13508–13517 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Phase membranes Oxygen permeable Résumé : CO2-stable oxygen-permeable Fe2O3 (FO) - Ce0.9Gd0.1O2-δ (CGO) dual phase composite membranes of the composition χ wt % FO - (100 – χ) wt % CGO with χ = 25, 40, 50 were successfully prepared via a one-pot single-step method. X-ray diffraction (XRD) demonstrated that all FO - CGO composite membranes after sintering at 1300 °C for 5 h represent a microscale mixture of only the two pure phases FO and CGO. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), and oxygen permeation revealed that the microstructure of the composition of the χ FO - (100 – χ) CGO dual phase membranes has a great influence on the oxygen permeability including its time-dependence. It was found that the composition of 40FO - 60CGO displays the highest oxygen permeability. An oxygen permeation flux of 0.18 mL/min·cm2 was obtained through the uncoated 40FO - 60CGO membrane with a thickness of 0.5 mm under an air/He oxygen gradient at 1000 °C. In situ XRD demonstrates that the 40FO - 60CGO material possesses a good phase stability not only in an atmosphere of 50 vol % CO2/50 vol % Ar but also in other atmospheres with a low oxygen partial pressure like reduced pressure (vacuum) and 5 vol % H2/95 vol % He. After coating the 40FO - 60CGO dual phase membrane with a porous La0.6Sr0.4CoO3-δ (LSC) layer of a few μm thicknesses on the air side, the oxygen permeation flux reaches the steady state immediately. This steady oxygen permeation flux of the LSC coated membrane was found to be 0.20 mL/min·cm2 unchanged for more than 150 h even when pure CO2 was used as the sweep gas, which indicates that the coated 40FO - 60CGO dual phase membrane is CO2 stable. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200517t [article] CO2 - Tolerant oxygen - permeable Fe2O3 - Ce0.9Gd0.1O2 - δ dual phase membranes [texte imprimé] / Huixia Luo, Auteur ; Heqing Jiang, Auteur ; Konstantin Efimov, Auteur . - 2012 . - pp. 13508–13517. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 23 (Décembre 2011) . - pp. 13508–13517 Mots-clés : Phase membranes Oxygen permeable Résumé : CO2-stable oxygen-permeable Fe2O3 (FO) - Ce0.9Gd0.1O2-δ (CGO) dual phase composite membranes of the composition χ wt % FO - (100 – χ) wt % CGO with χ = 25, 40, 50 were successfully prepared via a one-pot single-step method. X-ray diffraction (XRD) demonstrated that all FO - CGO composite membranes after sintering at 1300 °C for 5 h represent a microscale mixture of only the two pure phases FO and CGO. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDXS), and oxygen permeation revealed that the microstructure of the composition of the χ FO - (100 – χ) CGO dual phase membranes has a great influence on the oxygen permeability including its time-dependence. It was found that the composition of 40FO - 60CGO displays the highest oxygen permeability. An oxygen permeation flux of 0.18 mL/min·cm2 was obtained through the uncoated 40FO - 60CGO membrane with a thickness of 0.5 mm under an air/He oxygen gradient at 1000 °C. In situ XRD demonstrates that the 40FO - 60CGO material possesses a good phase stability not only in an atmosphere of 50 vol % CO2/50 vol % Ar but also in other atmospheres with a low oxygen partial pressure like reduced pressure (vacuum) and 5 vol % H2/95 vol % He. After coating the 40FO - 60CGO dual phase membrane with a porous La0.6Sr0.4CoO3-δ (LSC) layer of a few μm thicknesses on the air side, the oxygen permeation flux reaches the steady state immediately. This steady oxygen permeation flux of the LSC coated membrane was found to be 0.20 mL/min·cm2 unchanged for more than 150 h even when pure CO2 was used as the sweep gas, which indicates that the coated 40FO - 60CGO dual phase membrane is CO2 stable. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie200517t

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