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US 2016/0096151 A1Published application
Proton conducting ceramic membrane
AssigneeProtia, LLC
InventorsJosè Manuel Serra, Sonia Escolástico
Life of this patent
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Abstract
A proton conducting ceramic membrane comprising a conducting layer, wherein said conducting layer comprises a mixture of a rare-earth tungstate as herein defined and a mixed metal oxide as herein defined. The invention also relates to a reactor comprising said membrane and the use of said membrane in a dehydrogenation process.
Claims15
A proton conducting ceramic membrane comprising a conducting layer, wherein said conducting layer comprises a mixture of:
- (i) a rare-earth tungstate of formula (I)
- (Lnz1Dpz2)aWb-cM1cO12-y (I)
- wherein
- Ln is Y, an element numbered 57 to 71, or a mixture thereof;
- Dp is Y or an element numbered 57 to 71 of the periodic table different from Ln;
- Z1 is 0.5 to 1;
- Z2 is 0.5 to 0;
- M1 is a metal selected from the group consisting of Mo, Re, V, Cr, Nb, U and Mn, or a mixture thereof;
- the molar ratio of a:b is 4.8 to 6;
- c is 0 to (0.5*b);
- and
- y is 0≦y≦1.8 and is a number such that formula (I) is uncharged;
- and
- (ii) a mixed metal oxide selected from the group consisting of
- (a) a mixed metal oxide of formula (II)
- Lne-dM3dCr1-fM2fO3-x (II)
- wherein
- Ln is Y, an element numbered 57 to 71, or a mixture thereof;
- M3 is a metal selected from Ca, Sr or Ba;
- M2 is a metal selected from the group consisting of Al, Ga, Co, Ti, Mg, Mn, Fe, Ni, Y, Sc, Yb and Lu, or a mixture thereof;
- e is 0.95 to 1;
- d is 0.4 to 0.01;
- f is 0 to 0.5;
- and
- x is 0≦x≦0.5 and is a number such that formula (II) is uncharged;
- (b) a mixed metal oxide of formula (III) different to that of formula (I)
- (Lnz1Dpz2)aWb-cM1cO12-y (III)
- wherein Ln is Y or an element numbered 57 to 71, or a mixture thereof;
- Dp is Y or an element numbered 57 to 71 of the periodic table different from Ln;
- the molar ratio of a:b is 4.8 to 6;
- Z1 is 0.5 to 1;
- Z2 is 0.5 to 0;
- and
- M1 is a metal selected from the group consisting of Mo, Re, V, Cr, Nb, U and Mn, or a mixture thereof;
- c is 0 to (0.5*b);
- and
- y is 0≦y≦1.8 and a number such that formula (III) is uncharged;
- or
- (c) a spinel mixed metal oxide of formula (I)
- M4M5gO4-y (IV)
- wherein
- M5 is a metal selected from the group consisting of Al, Cr, Mn, Fe, Ti, Cu and Si or mixture thereof;
- M4 is a metal selected from the group consisting of Ni, Fe, Mg, Zn, Cu, Mn, Co and Ti or a mixture thereof;
- g is 1.5 to 2;
- and
- y 0≦y≦0.5 and is a number such that formula (IV) is uncharged;
- or a mixture of two or more of (a), (b) and (c).
44 more elements
Dependencies are inferred from the claim text.