A composite oxygen ion transport membrane having a dense layer, a porous support layer, an optional intermediate porous layer located between the porous support layer and the dense layer and an optional surface exchange layer, overlying the dense layer. The dense layer has electronic and ionic phase
A composite oxygen ion transport membrane having a dense layer, a porous support layer, an optional intermediate porous layer located between the porous support layer and the dense layer and an optional surface exchange layer, overlying the dense layer. The dense layer has electronic and ionic phases. The ionic phase is composed of scandia doped, yttrium or cerium stabilized zirconia. The electronic phase is composed of a metallic oxide containing lanthanum, strontium, chromium, iron and cobalt. The porous support layer is composed of zirconia partially stabilized with yttrium, scandium, aluminum or cerium or mixtures thereof. The intermediate porous layer, if used, contains the same ionic and electronic phases as the dense layer. The surface exchange layer is formed of an electronic phase of a metallic oxide of lanthanum and strontium that also contains chromium, iron and cobalt and an ionic phase of scandia doped zirconia stabilized with yttrium or cerium.
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1. A composite oxygen ion transport membrane comprising: a dense layer having an electronic phase and an ionic phase, wherein the electronic phase comprising (La1-xSrx)wCr1-y-zFeyCozO3-δ, where x is from about 0.1 to about 0.3, w is from about 0.93 to about 1.0, y is from about 0.15 to about 0.45, z
1. A composite oxygen ion transport membrane comprising: a dense layer having an electronic phase and an ionic phase, wherein the electronic phase comprising (La1-xSrx)wCr1-y-zFeyCozO3-δ, where x is from about 0.1 to about 0.3, w is from about 0.93 to about 1.0, y is from about 0.15 to about 0.45, z is from about 0.03 to about 0.1, and δ renders the compound charge neutral; and wherein the ionic phase comprises Zr1-x′Scx′Ay′O2-δ, where x′ is from about 0.1 to about 0.22, y′ is from about 0.01 to about 0.04, and A is Y or Ce or mixtures of Y and Ce; anda porous support layer formed of Zr1-x″Ax″O2-δ, where x″ is from about 0.05 to about 0.13, A is Y or Sc or Al or Ce or mixtures of Y, Sc, Al, and Ce. 2. The composite ion transport membrane of claim 1, further comprising a porous intermediate layer between the dense layer and the porous support layer wherein the porous intermediate layer is comprised of the electronic phase and the ionic phase. 3. The composite ion transport membrane of claim 2, further comprising: a surface exchange layer overlying the dense layer so that the dense layer is located between the surface exchange layer and the porous intermediate layer and wherein the surface exchange layer comprises an electronic conductor and an ionic conductor;wherein the electronic conductor of the surface exchange layer further comprises (La1-x′″Srx′″)w′″Cr1-y′″-z′″Fey′″Coz′″O3-δ, where x′″ is from about 0.1 to about 0.3, w′″ is from about 0.93 to about 1, y′″ is from about 0.25 to about 0.45, z′″ is from about 0.03 to about 0.1, and δ of said electronic conductor renders the compound charge neutral; andwherein the ionic conductor of the surface exchange layer further comprises Zr1-xivScxivAyivO2-δ, where xiv is from about 0.1 to about 0.22, yiv is from about 0.01 to about 0.04, and A is Y or Ce, and δ of said ionic conductor renders the compound charge neutral. 4. The composite ion transport membrane of claim 3, wherein: the ionic phase of the dense layer constitutes from about 35 percent to about 65 percent by volume of the dense layer;the ionic phase of the intermediate porous layer constitutes from about 35 percent to about 65 percent by volume of the intermediate porous layer; andthe ionic conductor of the surface exchange layer constitutes from about 35 percent to about 65 percent by volume of the surface exchange layer. 5. The composite ion transport membrane of claim 4, wherein: the ionic phase of the dense layer constitutes from about 50 percent to about 65% by volume of the dense layer;the ionic phase of the intermediate porous layer constitutes between about 40 percent to 60% by volume of the intermediate porous layer; andthe ionic conductor of the surface exchange layer constitutes about 40 percent by volume of the surface exchange layer. 6. The composite ion transport membrane of claim 1, wherein: the electronic phase of the dense layer is (La0.8Sr0.2)0.95Cr0.7Fe0.25Co0.05O3-δ; andthe ionic phase of the dense layer is Zr0.802Sc0.180Y0.018O2-δ. 7. The composite ion transport membrane of claim 2, wherein: the electronic phase of the dense layer and a porous intermediate layer is (La0.8Sr0.2)0.95Cr0.7Fe0.25CO0.05O3-δ; and the ionic phase of the dense layer and the porous intermediate layer is Zr0.802Sc0.180Y0.018O2-δ. 8. The composite ion transport membrane of claim 1 wherein said porous support layer further comprises Zr0.923Y0.077O2-δ. 9. The composite ion transport membrane of claim 5, wherein: the electronic phase of the dense layer and the porous intermediate layer is (La0.8Sr0.2)0.95Cr0.7Fe0.25Co0.05O3-δ;the ionic phase of the dense layer and the porous intermediate layer is Zr0.802Sc0.180Y0.018O2-δ;the porous support layer further comprises Zr0.923Y0.077O2-δ;the electronic conductor of surface exchange layer is (La0.8Sr0.2)0.95Cr0.7Fe0.25Co0.05O3-δ; andthe ionic conductor of surface exchange layer is Zr0.809 Sc0.182Ce0.009O2-δ. 10. The composite ion transport membrane of claim 1, wherein: a porous intermediate layer has a thickness from about 10 microns to about 30 microns, an average pore size from about 0.1 microns to about 1 micron, and a porosity from about 25 percent to about 50 percent;the porous support layer has a thickness from about 0.7 mm to about 2.5 mm, an average pore size from about 0.5 microns to about 3 microns, and a porosity from about 25 percent to about 50 percent; anda surface exchange layer has a thickness from about 10 microns to about 25 microns, an average pore size from about 0.1 microns to about 1 micron, and a porosity from about 25 percent to about 50 percent.
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