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A process for production of synthesis gas employing a catalytic membrane reactor wherein the membrane comprises a mixed metal oxide material.

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[ We claim:] [1.]1. A process for oxidizing a reactant gas capable of reacting with oxygen which comprises the steps of:(A) providing a catalytic membrane reactor cell comprising an oxidation zone and a reduction zone separated by a gas-impermeable membrane having a reduction surface and an oxidatio

[ We claim:] [1.]1. A process for oxidizing a reactant gas capable of reacting with oxygen which comprises the steps of:(A) providing a catalytic membrane reactor cell comprising an oxidation zone and a reduction zone separated by a gas-impermeable membrane having a reduction surface and an oxidation surface;(B) heating said reactor cell to a temperature of from about 300.degree. C. to about 1200.degree. C.;(C) passing an oxygen-containing gas in contact with the reduction surface of said membrane of said heated reactor in said reduction zone; and(D) providing said reactant gas in contact with the oxidation surface of said membrane of said heated reactor in said oxidation zone; rein the membrane comprises:a reduction surface and an oxidation surface and wherein said membrane comprises a mixed metal oxide material having the general stoichiometry A.sub.2-x A'.sub.x B.sub.2-y B'.sub.y O.sub.5+z where:A is an alkaline earth metal ion or mixture of alkaline earth metal ions;A' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the lanthanide series or is yttrium;B is a metal ion or mixture of metal ions wherein the metal is selected from the group consisting of 3d transition metals, and the group 13 metals;B' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the 3d transition metals, the group 13 metals, the lanthanides and yttrium;x is a number greater than or equal to 0 and less than or equal to 2;y is a number greater than or equal to 0 and less than or equal to 2; andz is a number greater than zero and less than one that renders the compound charge neutral. [5.]5. A process for separation of oxygen from an oxygen-containing gas which comprises the steps of:(A) providing a catalytic membrane reactor cell having an oxidation zone and a reduction zone separated by a gas-impermeable membrane having a reduction surface and an oxidation surface;(B) heating said reactor cell to a temperature of from about 300.degree. C. to about 1200.degree. C.;(C) passing an oxygen-containing gas in contact with the reduction surface of said membrane of said heated reactor in said reduction zone; and(D) providing for collection of separated oxygen from said oxidation zone; rein the membrane comprises a mixed metal oxide material having the general stoichiometry: ub.2-x A'.sub.x B.sub.2-y B'.sub.y O.sub.5+zwhere:A is an alkaline earth metal ion or mixture of alkaline earth metal ions;A' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the lanthanide series or is yttrium;B is a metal ion or mixture of metal ions wherein the metal is selected from the group consisting of 3d transition metals, and the group 13 metals;B' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the 3d transition metals, the group 13 metals, the lanthanides and yttrium;x is a number greater than or equal to 0 and less than or equal to 2;y is a number greater than or equal to 0 and less than or equal to 2; andz is a number greater than zero and less than one that renders the compound charge neutral. [7.]7. A process for production of synthesis gas which comprises the steps of:(A) providing a catalytic membrane reactor cell having an oxidation zone and a reduction zone separated by a gas-impermeable membrane having a reduction surface and an oxidation surface;(B) heating said reactor cell to a temperature of from about 300.degree. C. to about 1200.degree. C.;(C) passing an oxygen-containing gas in contact with the reduction surface of said membrane of said heated reactor in said reduction zone; and(D) providing methane or a mixture of CO.sub.2 and methane in contact with the oxidation surface of said membrane of said heated reactor in said oxidation zone; rein the membrane comprises a mixed metal oxide material having the general stoichiometry:where:A is an alkaline earth metal ion or mixture of alkaline earth metal ions;A' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the lanthanide series or is yttrium;B is a metal ion or mixture of metal ions wherein the metal is selected from the group consisting of 3d transition metals, and the group 13 metals;B' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the 3d transition metals, the group 13 metals, the lanthanides and yttrium;x is a number greater than or equal to 0 and less than or equal to 2;y is a number greater than or equal to 0 and less than or equal to 2; andz is a number greater than zero and less than one that renders the compound charge neutral. [9.]9. A process for making a gas-impermeable membrane for use in a catalytic membrane reactor which comprises the steps of:(A) combining metal precursors of the metals A, A', B and B' in the stoichiometry:where:A is an alkaline earth metal ion or mixture of alkaline earth metal ions;A' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the lanthanide series or is yttrium;B is a metal ion or mixture of metal ions wherein the metal is selected from the group consisting of 3d transition metals, and the group 13 metals;B' is a metal ion or mixture of metal ions where the metal is selected from the group consisting of the 3d transition metals, the group 13 metals, the lanthanides and yttrium;x is a number greater than or equal to 0 and less than or equal to 2;y is a number greater than or equal 0 and less than or equal to 2; andz is a number greater than zero and less than one that renders the compound charge neutralto form a homogeneous mixture;(B) calcining the homogeneous mixture at temperatures up to about 1450.degree. C. for 12 h in atmosphere;(C) reducing the particle size of the sintered mixture by attrition;(D) pressing the reduced-particle size mixture into a selected membrane shape; and(E) sintering the pressed shaped membrane at a temperature from about 1300.degree. C. to about 1450.degree. C. for 4 hours in atmosphere to obtain a sintered membrane of greater than or equal to 90% theoretical density.10. The process according to claim 1 wherein the B metal in the mixed metal oxide is selected from the group Al, Ga, In and mixtures thereof.11. The process according to claim 1 wherein the A metal in the mixed metal oxide is Sr.12. The process according to claim 1 wherein the A metal in the mixed metal oxide is Ca.13. The process according to claim 12 wherein the A' metal in the mixed metal oxide is La.14. The process according to claim 13 wherein the B metal is Fe.15. The process according to claim 14 wherein y is 0.16. The process according to claim 15 wherein 0