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US 6,150,290 AGranted
Ceramic material for use in the separation of oxygen from gas mixture
AssigneeHaldor Topsoe A/S
InventorsNiels Christiansen, Petru Gordes
Life of this patent
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Abstract
A perovskite ceramic material having the general formula: A.sub.x A'.sub.x' A".sub.x" B.sub.y B'.sub.y' B".sub.y" O.sub.3-.delta., wherein A, A' and A" each is one or more metals selected from the group of lanthanide metals; B, B' and B" each is a metal selected from the group of transition metals and group 3a, and noble metals of group 8b; x+x'+x"<1 and/or y+y'+y"<1 such that .SIGMA.x.sub.i .noteq..SIGMA.y.sub.i.
Claims8
A perovskite ceramic material having the general formula:
- A.sub.x A.sub.x' A.sub.x" B.sub.y B.sub.y' B.sub.y" O.sub.3-.delta.
- wherein
- A is lanthanum, A' and A" each is one or more metals selected from the group of lanthanide metals;
- B, B' and B" each is a metal selected from the group of Na, alkaline earth metals, transition metals, group 3a, and noble metals of group 8b;
- x+x'+x"<1 and/or y+y'+y"<1;
- .SIGMA.x.sub.i .noteq..SIGMA.y.sub.i such that the material is non-stoichiometric;
- -1<.delta.<1;
- and
- .delta..noteq.0.
6 more elements
A ceramic material having the formula La.sub.a Ln.sub.b M.sub.c Ga.sub.d M'.sub.e O.sub.3-.delta., wherein
- Ln is a combination of Ce, Pr and Nd and optionally a further lanthanide metal;
- M is at least one alkaline earth metal or sodium;
- M' is at least one metal selected from Group 2a, 3b, 4b, 5b, 6b, 7b, 8, 1b, 2b, 3a, 4a and noble metals of group 8b metals of the periodic table;
- and
- wherein
- a+b+c<1 and/or d+e<1;
- and
- a+b+c.noteq.d+e such that the material is non-stoichiometric,
- -1<.delta.<1;
- and
- .delta..noteq.0.
8 more elements
Dependencies are inferred from the claim text.