Electrochemical permeability of Sr0.7(Ti,Fe)O3âÎ´ materials

Jurado, J. R.

doi:10.1016/s0167-2738(98)00471-8

Cited by 58 publications

(57 citation statements)

References 13 publications

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“…Standard powder reactions and the glycine-nitrate method have been used to prepare powders of a variety of materials with perovskite, K 2 NiF 4 , and other structure types, as described in detail elsewhere [6][7][8][9][10][13][14][15][16][17], with intermediate calcination and regrinding steps to ensure complete conversion of reactants and homogeneity. XRD was used for phase identification, and to evaluate the unit cell parameters.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The flux density supplied by the mixed conducting wall is a function of the gradient of oxygen chemical potential. If process is controlled by mixed conduction [3,7]:…”

Section: Simulation Of Limiting Working Conditions In Membrane Reactorsmentioning

confidence: 99%

“…A relatively wide range of mixed conductors has been studied for these membrane reactors [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17], including single phase and composite materials consisting of a metallic conductor and a good ionic conductor. This concept is widely discarded because these composite materials are either based on noble metals of prohibitive cost, or fail to meet the required stability (e.g.Ag/Bi(Er)O 1.5 ) or oxidation resistance conditions.…”

Section: Introductionmentioning

confidence: 99%

“…This concept is widely discarded because these composite materials are either based on noble metals of prohibitive cost, or fail to meet the required stability (e.g.Ag/Bi(Er)O 1.5 ) or oxidation resistance conditions. The emphasis has thus been on mixed conducting ceramics, mainly single phase [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16], and occasionally 2-phase ceramic/ceramic composites [17]. Perovskite materials Sr 1-x La x CoO 3-δ [3][4][5] and Sr 1-x La x FeO 3-δ possess the highest permeability, limited stability, and excessive thermal and chemical expansion.…”

Section: Introductionmentioning

confidence: 99%

“…Other mixed conductors are based on perovskite materials with higher stability (e.g. gallates [6,10] and titanates [7][8][9]) with mixed valent additives. Some La 2 NiO 4 -based materials combine good permeability and relatively low thermal thermal expansion [12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Materiales conductores mixtos para la Oxidación Parcial de Hidrocarburos

Frade¹,

Хартон²,

Yaremchenko³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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Thermodynamic calculations with additional conditions for the conservation of carbon and hydrogen were used to predict the gas composition obtained by partial oxidation of methane as a function of oxygen partial pressure and temperature; this was used to assess the stability and oxygen permeability requirements of mixed conducting membrane materials proposed for this purpose. A re-examination of known mixed conductors shows that most materials with highest permeability still fail to fulfil the requirements of stability under reducing conditions. Other materials possess sufficient stability but their oxygen permeability is insufficient. Different approaches were thus used to attempt to overcome those limitations, including changes in composition in the A and B site positions of ABO 3 perovskites, and tests of materials with different structure types. Promising results were obtained mainly for some materials with perovskite or related K 2 NiF 4 -type structures. Limited stability of the most promising materials shows that one should rely mainly on kinetic limitations in the permeate side to protect the mixed conductor from severe reducing conditions. Materiales conductores mixtos para la Oxidación Parcial de HidrocarburosSe han usado cálculos termodinámicos con condiciones adicionales para la conservación del carbono e hidrógeno para predecir la composición del gas obtenido mediante la oxidación parcial del metano en función de la presión parcial de oxígeno y de la temperatura; esto se ha usado para asegurar los requerimientos de estabilidad y permeabilidad al oxígeno de los materiales conductores mixtos empleados como membrana para este propósito. Un nuevo exámen de los conductores mixtos conocidos muestra que la mayoría de los materiales con la mayor permeabilidad todavía fallan en el cumplimiento de los requerimientos de estabilidad bajo condiciones reductoras. Otros materiales poseen suficiente estabilidad, pero su permeabilidad al oxígeno es insuficiente. Por ello se han empleado diferentes aproximaciones para intentar superar esas limitaciones, incluyendo cambios en la composición en las posiciones A y B de de las perovsquitas ABO 3 , y pruebas con materiales con estructuras diferentes. Se han obtenido resultados prometedores principalmente en algunos materiales con estructura perovsquita o estructuras relacionadas con K 2 NiF 4 . La estabilidad limitada de los materiales más prometedores muestra que los estudios deben hacerse principalmente sobre las limitaciones cinéticas del lado permeable para proteger el conductor mixto en condiciones reductoras severas.

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Section: Experimental Methodsmentioning

confidence: 99%

“…The flux density supplied by the mixed conducting wall is a function of the gradient of oxygen chemical potential. If process is controlled by mixed conduction [3,7]:…”

Section: Simulation Of Limiting Working Conditions In Membrane Reactorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Materiales conductores mixtos para la Oxidación Parcial de Hidrocarburos

Frade¹,

Хартон²,

Yaremchenko³

et al. 2004

Bol. Soc. Esp. Ceram. Vidr.

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Effect of Phase Ratio on Hydrogen Separation of Dual‐phase Membrane Reactors

Wang

Cai

Liang

et al. 2021

Chemie Ingenieur Technik

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Dedicated to Prof. Dr. rer. nat. Ju ¨rgen Caro on the occasion of his 70th birthday Three dual-phase MIEC membranes (100x) wt % Ce 0.8 Sm 0.2 O 1.9 (SDC)x wt % Sr 0.92 Ti 0.5 Fe 0.5 O 3-d (STF) (x = 30, 40, 50) were prepared by a one-pot solid state reaction to explore the effect of phase ratio of dual-phase membranes on the hydrogen separation performance of oxygen-permeable membrane reactors. Single-phase STF was synthesized by the same method for comparison. The grains of the two phases in the three dual-phase membranes are uniformly and continuously distributed forming the three-dimensional connected networks. Dual-phase membranes have higher total conductivity than that of STF under simulated working atmospheres, and the total conductivity decreases with the increase of STF content. Under various test conditions, the hydrogen separation rate of the dual-phase membranes is higher than that of the STF membrane.

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