Comparison of oxygen permeability and stability of perovskite type La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) membranes

Shiguang Li; Wanqin Jin; Pei Huang; Nanping Xu; Jun Shi; Y. S. Lin; Michael Z.C. Hu; E. Andrew Payzant

doi:10.1021/ie9900014

Comparison of oxygen permeability and stability of perovskite type La_0.2A_0.8Co_0.2Fe_0.8O(3-δ) (A = Sr, Ba, Ca) membranes

Shiguang Li, Wanqin Jin, Pei Huang, Nanping Xu, Jun Shi, Y. S. Lin, Michael Z.C. Hu, E. Andrew Payzant

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Abstract

The oxygen permeation and stability of La_0.2A_0.8Co_0.2Fe_0.8O(3-δ) (A = Sr, Ba, Ca) perovskite-type membranes were studied at high temperatures and low oxygen partial pressures. The oxygen vacancy diffusivity and concentration gradient calculated from the unsteady-state and steady-state oxygen data for the three membranes decrease in the order of Sr > Ba > Ca. The activation energies for oxygen permeation increase in the order of Sr < Ba < Ca. The oxygen permeation data of the three membranes can be explained by the average bond energy, free volume, and critical radius of the materials. After exposure to air at 1173 K for 10 h, part of La_0.2Sr_0.8Co_0.2Fe_0.8O(3-δ) transforms to La₂O₃, SrO, CoO, and Fe and the crystallite size of the perovskite phase decreases. These changes were not observed for La_0.2Ba_0.8Co_0.2Fe_0.8O(3-δ) under the same conditions, indicating that La_0.2Ba_0.8Co_0.2Fe_0.8O(3-δ) membrane is much more stable than La_0.2Sr_0.8Co_0.2Fe_0.8O(3-δ) at high temperatures and low oxygen partial pressures.

Original language	English
Pages (from-to)	2963-2972
Number of pages	10
Journal	Industrial and Engineering Chemistry Research
Volume	38
Issue number	8
DOIs	https://doi.org/10.1021/ie9900014
State	Published - 1999

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@article{b97453cde28847a99d49728e738b03ca,

title = "Comparison of oxygen permeability and stability of perovskite type La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) membranes",

abstract = "The oxygen permeation and stability of La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) perovskite-type membranes were studied at high temperatures and low oxygen partial pressures. The oxygen vacancy diffusivity and concentration gradient calculated from the unsteady-state and steady-state oxygen data for the three membranes decrease in the order of Sr > Ba > Ca. The activation energies for oxygen permeation increase in the order of Sr < Ba < Ca. The oxygen permeation data of the three membranes can be explained by the average bond energy, free volume, and critical radius of the materials. After exposure to air at 1173 K for 10 h, part of La0.2Sr0.8Co0.2Fe0.8O(3-δ) transforms to La2O3, SrO, CoO, and Fe and the crystallite size of the perovskite phase decreases. These changes were not observed for La0.2Ba0.8Co0.2Fe0.8O(3-δ) under the same conditions, indicating that La0.2Ba0.8Co0.2Fe0.8O(3-δ) membrane is much more stable than La0.2Sr0.8Co0.2Fe0.8O(3-δ) at high temperatures and low oxygen partial pressures.",

author = "Shiguang Li and Wanqin Jin and Pei Huang and Nanping Xu and Jun Shi and Lin, \{Y. S.\} and Hu, \{Michael Z.C.\} and Payzant, \{E. Andrew\}",

year = "1999",

doi = "10.1021/ie9900014",

language = "English",

volume = "38",

pages = "2963--2972",

journal = "Industrial and Engineering Chemistry Research",

issn = "0888-5885",

publisher = "American Chemical Society",

number = "8",

}

TY - JOUR

T1 - Comparison of oxygen permeability and stability of perovskite type La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) membranes

AU - Li, Shiguang

AU - Jin, Wanqin

AU - Huang, Pei

AU - Xu, Nanping

AU - Shi, Jun

AU - Lin, Y. S.

AU - Hu, Michael Z.C.

AU - Payzant, E. Andrew

PY - 1999

Y1 - 1999

N2 - The oxygen permeation and stability of La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) perovskite-type membranes were studied at high temperatures and low oxygen partial pressures. The oxygen vacancy diffusivity and concentration gradient calculated from the unsteady-state and steady-state oxygen data for the three membranes decrease in the order of Sr > Ba > Ca. The activation energies for oxygen permeation increase in the order of Sr < Ba < Ca. The oxygen permeation data of the three membranes can be explained by the average bond energy, free volume, and critical radius of the materials. After exposure to air at 1173 K for 10 h, part of La0.2Sr0.8Co0.2Fe0.8O(3-δ) transforms to La2O3, SrO, CoO, and Fe and the crystallite size of the perovskite phase decreases. These changes were not observed for La0.2Ba0.8Co0.2Fe0.8O(3-δ) under the same conditions, indicating that La0.2Ba0.8Co0.2Fe0.8O(3-δ) membrane is much more stable than La0.2Sr0.8Co0.2Fe0.8O(3-δ) at high temperatures and low oxygen partial pressures.

AB - The oxygen permeation and stability of La0.2A0.8Co0.2Fe0.8O(3-δ) (A = Sr, Ba, Ca) perovskite-type membranes were studied at high temperatures and low oxygen partial pressures. The oxygen vacancy diffusivity and concentration gradient calculated from the unsteady-state and steady-state oxygen data for the three membranes decrease in the order of Sr > Ba > Ca. The activation energies for oxygen permeation increase in the order of Sr < Ba < Ca. The oxygen permeation data of the three membranes can be explained by the average bond energy, free volume, and critical radius of the materials. After exposure to air at 1173 K for 10 h, part of La0.2Sr0.8Co0.2Fe0.8O(3-δ) transforms to La2O3, SrO, CoO, and Fe and the crystallite size of the perovskite phase decreases. These changes were not observed for La0.2Ba0.8Co0.2Fe0.8O(3-δ) under the same conditions, indicating that La0.2Ba0.8Co0.2Fe0.8O(3-δ) membrane is much more stable than La0.2Sr0.8Co0.2Fe0.8O(3-δ) at high temperatures and low oxygen partial pressures.

UR - https://www.scopus.com/pages/publications/0032839175

U2 - 10.1021/ie9900014

DO - 10.1021/ie9900014

M3 - Article

AN - SCOPUS:0032839175

SN - 0888-5885

VL - 38

SP - 2963

EP - 2972

JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 8

ER -

Comparison of oxygen permeability and stability of perovskite type La_0.2A_0.8Co_0.2Fe_0.8O(3-δ) (A = Sr, Ba, Ca) membranes

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