| 主权项 |
1. 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). |
