| 摘要 |
A method of producing a composite oxygen ion membrane and a composite oxygen ion membrane in which a porous fuel oxidation layer and a dense separation layer and optionally, a porous surface exchange layer are formed on a porous support from mixtures of (Ln1-xAx)wCr1-yByO3-δ and a doped zirconia. In the porous fuel oxidation layer and the optional porous surface exchange layer, A is Calcium and in the dense separation layer A is not Calcium and, preferably is Strontium. Preferred materials are (La0.8Ca0.2)0.95Cr0.5Mn0.5O3-δ for the porous fuel oxidation and optional porous surface exchange layers and (La0.8Sr0.2)0.95Cr0.5Fe0.5O3-δ for the dense separation layer. The use of such materials allows the membrane to sintered in air and without the use of pore formers to reduce membrane manufacturing costs. The use of materials, as described herein, for forming the porous layers have application for forming any type of porous structure, such as a catalyst support. |
| 主权项 |
1. A method of producing an oxygen ion composite membrane comprising:
forming a first layer on a porous support, the first layer comprising a first mixture of particles of (Ln1-xAx)wCr1-yByO3-δ and doped zirconia where Ln is La, Y, Pr, Ce or Sm; A is Ca or Sr; B is Fe, Mn, Co, Al, Ti or combinations thereof; w is between about 0.9 and 1.1; x is between about 0.1 and 0.4 and y is between about 0.1 and 0.6; forming a second layer on the first layer, the second layer comprising a second mixture of particles of (Ln1-xAx)wCr1-yByO3-δ and the doped zirconia, where Ln is La, Y, Pr, Ce or Sm; A is Sr; and B is Fe, Mn, Co, Al, Ti or combinations thereof; w is between about 0.9 and 1.1; x is between about 0.1 and 0.4 and y is between about 0.1 and 0.6; and sintering the porous support, the first layer and the second layer in air at temperatures of greater than about 1300° C. to produce the oxygen ion composite membrane; wherein the produced oxygen ion composite membrane comprises the porous support, a porous fuel oxidation layer of the first layer and a dense separation layer of the second layer. |
