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 temperatu
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.degree.-950.degree. C., having no connected through porosity wherein the membrane is of a composition represented by the formula [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-.delta., where A.tbd.Ca, Sr, Ba, and mixtures thereof; A'.tbd.La, Y, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Th, U, and mixtures thereof; B.tbd.Fe, Mn, Cr, V, Ti, and mixtures thereof; B'.tbd.Cu, Ni, and mixtures thereof; .about.0.0001.ltoreq.x.ltoreq..about.0.1; .about.0.002.ltoreq.y<0.05; .about.0.0005.ltoreq.z.ltoreq..about.0.3; .delta. is determined by the valence of the metals.
대표청구항▼
[ We claim:] [1.] A fluid separation device utilizing at least one membrane, wherein said membrane comprises a composition of substantially cubic perovskite structure, represented by the empirical formula EQU [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-.delta., reinA is chosen from
[ We claim:] [1.] A fluid separation device utilizing at least one membrane, wherein said membrane comprises a composition of substantially cubic perovskite structure, represented by the empirical formula EQU [A.sub.1-x A'.sub.x ][Co.sub.1-y-z B.sub.y B'.sub.z ]O.sub.3-.delta., reinA 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 lta. is determined by the valence of the metals.
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