US5648304A
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Oxygen permeable mixed conductor membranes
Assignee: Individual
•
Filing: 1996-03-13
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Granted: 1997-07-15
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Expires: 2016-03-13
Abstract
Abstract The present invention relates to novel solid state mixed conductor membranes and their use for separating oxygen from oxygen-containing feeds at elevated temperatures. The membranes comprise a multicomponent metallic oxide of substantially cubic perovskite structure, stable in air over the temperature range of 25 DEG -950 DEG C., having no connected through porosity wherein the membrane is of a composition represented by the formula [A1-xA'x][Co1-y-zByB'z]O3- delta , where A 3BOND Ca, Sr, Ba, and mixtures thereof; A' 3BOND La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B 3BOND Fe, Mn, Cr, V, Ti, and mixtures thereof; B' 3BOND Cu, Ni, and mixtures thereof; DIFFERENCE 0.0001</=x</= DIFFERENCE 0.1; DIFFERENCE 0.002</=y<0.05; DIFFERENCE 0.0005</=z</= DIFFERENCE 0.3; delta is determined by the valence of the metals.
Inventors
- 👤 Terry J. Mazanec
- 👤 Thomas L. Cable
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:59
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0081; B01D67/0083; B01D53/00; B01D53/22; B01D53/228; B01D53/32; B01D53/326; B01D67/0039; B01D67/0041; B01D67/00411; B01D67/0046; B01D71/00; B01D71/02; B01D71/022; B01D71/0223; B01D71/024; B01D71/0271; B01J; B01J19/00; B01J19/24; B01J19/2475; B01J8/00; B01J8/008; B01J8/009; C; C01; C01B; C01B13/00; C01B13/02; C01B13/0229; C01B13/0248; C01B13/0251; C01B13/0255; C01B3/00; C01B3/02; C01B3/32; C01B3/34; C01B3/38; C01B3/386; C01G; C01G51/00; C01G51/40; C01G51/66; C01G51/68; C01G53/00; C01G53/40; C01G53/66; C01G53/68; C04; C04B; C04B35/00; C04B35/01; B01D2323/00; B01D2323/12; B01D2325/00; B01D2325/04; B01D2325/26; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00054; B01J2219/00056; B01J2219/00058; B01J2219/00063; B01J2219/00132; C01B2203/00; C01B2203/02; C01B2203/025; C01B2203/0261; C01B2203/10; C01B2203/1005; C01B2203/1035; C01B2203/12; C01B2203/1205; C01B2203/1211; C01B2203/1235; C01B2203/1241; C01B2203/1258; C01B2210/00; C01B2210/0043; C01B2210/0046; C01B2210/0062; C01B2210/0078; C01B2210/0079; C01P; C01P2002/00; C01P2002/30; C01P2002/34; C01P2002/50; C01P2002/52; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/80
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
149 words
A composition comprising substantially cubic perovskite structure, substantially stable in air over the temperature range of 25°-950° C., represented by the empirical formula [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-δ, wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals.
Claim 2
Dependent Claim
149 words
A composition comprising substantially cubic perovskite structure, substantially stable in air over the temperature range of 25°-950° C., represented by the empirical formula [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-δ, wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals.
Claim 3
Dependent Claim
17 words
The composition according to claim 1 wherein said composition contains not less than 90% cubic perovskite material.
Claim 4
Dependent Claim
17 words
The composition according to claim 1 wherein said composition contains not less than 95% cubic perovskite material.
Claim 5
Dependent Claim
17 words
The composition according to claim 1 wherein said composition contains not less than 98% cubic perovskite material.
Claim 6
Dependent Claim
14 words
The composition according to claim 1 wherein A comprises Sr and A' comprises La.
Claim 7
Dependent Claim
10 words
The composition according to claim 5 wherein B comprises Fe.
Claim 8
Dependent Claim
33 words
The composition according to claim 5 wherein y is not less than about 0.0025 and not greater than 0.01; and z is not less than about 0.001 and not greater than about 0.05.
Claim 9
Dependent Claim
43 words
The composition according to claim 1 wherein the A site cations are represented by the empirical formula [Sr 1-x-x' La x Ca x' ], where x is greater than about 0.02 and less than about 0.1, and x' is less than about 0.01.
Claim 10
Dependent Claim
10 words
The composition according to claim 8 wherein B comprises Fe.
Claim 11
Dependent Claim
97 words
The composition according to claim 1 wherein said composition is selected from the group consisting of [Sr.sub.0.95-x' La.sub.0.05 Ca.sub.x' ][Co.sub.1-y-z Fe.sub.y Ni.sub.z ]O.sub.3-δ, [Sr.sub.0.95-x' La.sub.0.05 Ca.sub.x' ][Co.sub.1-y-z Mn.sub.y Ni.sub.z ]O.sub.3-δ, [Sr.sub.0.95-x' La.sub.0.05 Ca.sub.x' ][Co.sub.1-y-z Fe.sub.y Cu.sub.z ]O.sub.3-δ, [Sr.sub.0.95-x' La.sub.0.05 Ca.sub.x' ][Co.sub.1-y-z Mn.sub.y Cu.sub.z ]O.sub.3-δ, and mixtures of the same, where x' is greater than about 0.001 and less than about 0.01, y is not less than about 0.0025 and not greater than about 0.01, z is not less than about 0.001 and not greater than about 0.05, and δ is determined by the valence of the metals.
Claim 12
Dependent Claim
33 words
The composition according to claim 1 wherein y is not less than about 0.0025 and not greater than 0.01; and z is not less than about 0.001 and not greater than about 0.05.
Claim 13
Dependent Claim
165 words
A membrane comprising a composition of substantially cubic perovskite structure, substantially stable in air over the temperature range of 25°-950° C., represented by the empirical formula [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-δ wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals; wherein said membrane has a thickness between about 0.0005 and about 2 mm.
Claim 14
Dependent Claim
165 words
A membrane comprising a composition of substantially cubic perovskite structure, substantially stable in air over the temperature range of 25°-950° C., represented by the empirical formula [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-δ wherein A is chosen from the group consisting of Ca, Sr, Ba, and mixtures thereof; A' is chosen from the group consisting of La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B is chosen from the group consisting of Fe, Mn, Cr, V, Ti, and mixtures thereof; B' is chosen from the group consisting of Cu, Ni, and mixtures thereof; x is not less than about 0.0001 and not greater than about 0.1; y is not less than about 0.002 and less than 0.05; z is not less than about 0.0005 and not greater than about 0.3; and δ is determined by the valence of the metals; wherein said membrane has a thickness between about 0.0005 and about 2 mm.
References Cited (Backward Citations)
US2444222A
Cited
US3509694A
Cited
US3359705A
Cited
US4888033A
Cited
US4151060A
Cited
US4483694A
Cited
US4599157A
Cited
US4885142A
Cited
US4827071A
Cited
US4791079A
Cited
US4851303A
Cited
EP0438902A2
Cited
US5061682A
Cited
US5240480A
Cited
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