Ion transport membranes with catalyzed dense layer
AssigneeAir Products and Chemicals, Inc.
InventorsMichael F. Carolan, Paul N. Dyer
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Abstract
The present invention relates to surface catalyzed ion transport membranes which demonstrate superior oxygen flux. The membranes comprise a dense multicomponent metallic oxide layer having a first surface and a second surface wherein the first surface is coated with a catalyst such as a metal or an oxide of a metal selected from Groups II, V, VI, VII, VIII, IX, X, XI, XV and the F Block lanthanides of the Periodic Table of the Elements. One or more porous layers formed from a mixed conducting multicomponent metallic oxide or a material which is not mixed conducting under process operating conditions may be formed contiguous to the second surface of the dense layer. The claimed membranes are capable of separating oxygen from oxygen-containing gaseous mixtures.
Claims25
An ion transport membrane comprising a dense mixed conducting multicomponent metallic oxide layer having a first surface contiguous to a porous layer and a second surface which is coated with a catalyst comprising a metal or an oxide of a metal selected from Groups II, V, VI, VII, VIII, IX, X, XI and XV and the F Block lanthanides of the Periodic Table of the Elements according to the International Union of Pure and Applied Chemistry wherein the dense mixed conducting multicomponent metallic oxide layer and the porous layer are independently formed from one or a mixture of multicomponent metallic oxides represented by the formula A.sub.x A'.sub.x' A".sub.x" B.sub.y B'.sub.y' B".sub.y" O.sub.3-z, where A,A' and A" are chosen from the group comprising Groups 1, 2 and 3 and the F block lanthanides;
- and B,B' and B" are chosen from the D block transition metals according to the Periodic Table of the Elements wherein 0<x.ltoreq.1, 0.ltoreq.x'.ltoreq.1, 0.ltoreq.x".ltoreq.1, 0<y.ltoreq.1, 0.ltoreq.y'.ltoreq.1, 0.ltoreq.y".ltoreq.1, x+x'+x"=1, y+y'+y"=1 and z is a number which renders the compound charge neutral.
An ion transport membrane comprising a mixed conducting multicomponent metallic oxide dense layer having a first surface which is coated with a catalyst comprising a metal or an oxide of a metal selected from Groups II, V, VI, VII, VIII, IX, X, XI and XV and the F block lanthanides of the Periodic Table of the Elements according to the International Union of Pure and Applied Chemistry and a second surface contiguous to a plurality of porous layers, each respective porous layer having a discrete average pore radius wherein the average pore radius of each respective porous layer is larger than the average pore radius of the preceding porous layer as a function of distance from the dense layer.
Dependencies are inferred from the claim text.