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US 7,744,675 B2Granted
Gas separation membrane comprising a substrate with a layer of coated inorganic oxide particles and an overlayer of a gas-selective material, and its manufacture and use
AssigneeShell Oil Company
InventorsJohn Charles Saukaitis, Alan Anthony Del Paggio
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Abstract
A gas separation membrane and a method of manufacturing such gas separation membrane that comprises a porous substrate treated with a layer of metal-coated inorganic oxide particles and with the layer of such metal-coated inorganic oxide particles being coated with an overlayer of a gas-selective material.
Claims23
A method of making a gas separation membrane, wherein said method comprises:
- preparing a noble metal eggshell catalyst by spray coating or spray drying an inorganic oxide particle having a median particle size in the range of from 0.01 to 50 μm with a noble metal or noble metal compound thereby producing a metallic layer on the outer surface of said inorganic oxide particle, said metallic layer having a layer thickness in the range of from 0.01 to 2.5 μm
- applying to a surface of a porous substrate a layer of said noble metal eggshell catalyst to thereby provide a surface treated porous substrate;
- and
- coating said surface-treated porous substrate with an overlayer of a gas-selective material to thereby provide a coated, surface-treated porous substrate suitable for use as said gas separation membrane.
1 more element
A gas separation membrane, comprising:
- a porous substrate treated with a layer of a noble metal eggshell catalyst, said noble metal eggshell catalyst comprising an inorganic oxide particle having a median particle size in the range of from 0.01 to 50 μm coated on the outer surface by spray coating or spray drying with a metallic layer of noble metal or noble metal compound, said metallic layer having a layer thickness in the range of from 0.01 to 2.5 μm, with said layer of noble metal eggshell catalyst being coated with an overlayer of a gas-selective material.
A process for separating hydrogen from a hydrogen-containing gas stream, wherein said process comprises:
- passing said hydrogen-containing gas stream over a gas separation membrane, comprising a porous substrate treated with a layer of a noble metal eggshell catalyst, said noble metal eggshell catalyst comprising an inorganic oxide particle having a median particle size in the range of from 0.01 to 50 μm coated on the outer surface by spray coating or spray drying with a metallic layer of noble metal or noble metal compound, said metallic layer having a layer thickness in the range of from 0.01 to 2.5 μm, with said layer of noble metal eggshell catalyst being coated with an overlayer of a gas-selective material, under temperature and pressure conditions such that hydrogen from said hydrogen-containing gas stream selectively passes through said gas separation membrane.
Dependencies are inferred from the claim text.