Composite mixed conductor membranes for producing oxygen
AssigneeAir Products and Chemicals, Inc.
InventorsRobert M. Thorogood, Rajagopalan Srinivasan, Terrence F. Yee, Miles P. Drake
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Abstract
The present invention relates to novel multi-layer composite solid state membranes which are capable of separating oxygen from oxygen-containing gaseous mixtures at elevated temperatures. The membranes comprise a multicomponent metallic oxide porous layer having an average pore radius of less than about 10 micrometers and a multicomponent metallic oxide dense layer having no connected through porosity wherein the porous and dense layers are contiguous and such layers conduct electrons and oxygen ions at operating temperatures.
Claims36
A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a porous layer having an average pore radius of less than about 10 micrometers and a dense layer having no connected through porosity wherein the porous layer and the dense layer are contiguous and each layer comprises a multicomponent metallic oxide capable of conducting electrons and oxygen ions at a temperature greater than about 500.degree. C.
A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a dense layer having no connected through porosity, which dense layer is contiguous to a porous layer having an average pore radius which increases as a function of distance away from the dense layer, the porous layer and the dense layer which are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at a temperature greater than about 500.degree. C.
A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a dense layer having no connected through porosity and 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 function of distance away from the dense layer, the porous layer and the dense layer which are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at temperatures greater than about 500.degree. C.
A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a first porous layer formed from a multicomponent metallic oxide having an average pore radius of less than about 10 micrometers which is deposed to a second porous layer which is not a mixed conducting oxide, the first porous layer being contiguous with a dense layer having no connected through porosity comprising a multicomponent metallic oxide capable of conducting oxygen ions at temperatures greater than about 500.degree. C.
A membrane capable of separating oxygen from an oxygen-containing gaseous mixture, which membrane comprises a first porous layer and a second porous layer which are separated by and contiguous with a dense layer having no connected through porosity wherein the first porous layer, the second porous layer and the dense layer are independently formed from a multicomponent metallic oxide capable of conducting electrons and oxygen ions at temperatures greater than about 500.degree. C.
Dependencies are inferred from the claim text.