Hydrogen permeation through mixed protonic-electronic conducting materials
AssigneeHer Majesty the Queen in right of Canada, as represented by the Minister of Natural Resources
InventorsEric D. Wachsman, Naixiong Jiang
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Abstract
An ionic conductor has been developed which exhibits both hydrogen ion conductivity and electronic conductivity. The conductor is a perovskite-type oxide represented by the general formula: ABO3 where A consists of at least one element selected from the group consisting of Ba, Ca, Mg and Sr and B is Ce1−xMx where M is a multivalent dopant metal, preferably Eu or Tb, and x is greater than 0 and less than 1. It is particularly useful in processes in which hydrogen is separated from a hydrogen-containing gas, e.g. in conversion of natural gas, operation of hydrogen fuel cells, etc.
Claims7
A process for hydrogen separation from a hydrogen-containing gas comprising contacting a first side of a gas impermeable mixed hydrogen ion and electronic conducting membrane with said hydrogen containing gas at an elevated pressure concurrently with contacting a second opposite side of said membrane with gas at a lower pressure than said hydrogen containing gas and withdrawing hydrogen ions emerging from said second opposite side of said membrane, said mixed hydrogen ion and electronic conducting membrane comprising a perovskite oxide represented by the general formula:
- ABO3
- where A consists of at least one element selected from the group consisting of Ba, Ca, Mg and Sr and B is Ce1−xMx where M is a multivalent dopant metal selected from the group consisting of Eu and Tb and x has a value between 0.05 and 0.40.
A process for hydrogen separation from a hydrogen-containing gas comprising contacting a first side of a gas impermeable mixed hydrogen ion and electronic conducting membrane with said hydrogen containing gas at an elevated pressure concurrently with contacting a second opposite side of said membrane with gas at a lower pressure than said hydrogen containing gas and withdrawing hydrogen ions emerging from said second opposite side of said membrane, said mixed hydrogen ion and electronic conducting membrane comprising a perovskite oxide represented by the general formula:
- BaCe1−xEuxO3
- where x has a value between 0.05 and 0.40.
Dependencies are inferred from the claim text.