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Composite oxygen transport membrane

  • US 9,486,735 B2
  • Filed: 09/16/2015
  • Issued: 11/08/2016
  • Est. Priority Date: 12/15/2011
  • Status: Active Grant
First Claim
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1. A method of producing an oxygen ion composite membrane comprising:

  • forming a first layer on a porous support containing a first mixture of particles of (Ln1-xAx)wCr1-yByO3-δ

    and doped zirconia and pore formers, 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 from about 0.9 to about 1.0, x is from about 0.1 to about 0.3 and y is from about 0.1 to about 0.6;

    the first mixture containing the (Ln1-xAx)wCr1-yByO3-δ

    and the doped zirconia such that when sintered, the first layer will contain the (Ln1-xAx)wCr1-yByO3-δ

    and the doped zirconia in a first volume percentage of (Ln1-xAx)wCr1-yByO3-δ

    of from about 30% to about 70% of the total solid mass;

    forming a second layer on the first layer that contains a second mixture of particles of (Ln1-xAx)wCr1-yByO3-δ

    and the doped zirconia and that does not contain pore formers, 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 from about 0.9 to about 1.0, x is from about 0.1 to about 0.3 and y is from about 0.3 to about 0.7;

    the second mixture containing the (Ln1-xAx)wCr1-yByO3-δ

    and the doped zirconia such that when sintered, the second layer will contain the (Ln1-xAx)wCr1-yByO3-δ

    and the doped zirconia in a second volume percentage of (Ln1-xAx)wCr1-yByO3-δ

    of from about 30% to about 70% of the total solid mass;

    heating the first layer, the second layer and the porous support in nitrogen atmosphere so that said first layer partially sinters into a porous mass containing the first mixture of particles, thereby to provide a porous fuel oxidation layer and the second layer fully sinters into a densified mass containing the second mixture of particles, thereby to provide a dense separation layer.

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