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 i
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.
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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)whereinLn is Y, an element numbered 57 to 71, or a mixture thereof;Dp is Y or an element numbered 57 to 7
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)whereinLn 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); andy is 0≤y≤1.8 and is a number such that formula (I) is uncharged; and(ii) a mixed metal oxide of formula (II) Lne-dM3dCr1-fM2fO3-x (II)whereinLn 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; andx is 0≤x≤0.5 and is a number such that formula (II) is uncharged. 2. A membrane as claimed in claim 1, wherein the rare-earth tungstate (i) is of formula (I′) LaaWb-cMocO12-y (I′)wherein the molar ratio of a:b is 4.8 to 6;c is 0 to (0.5*b); andy is a number such that formula (I) is uncharged and y is 0≤y≤1.8. 3. A membrane as claimed in claim 1, wherein the mixed metal oxide (ii) is of formula (II′) Lne-dSrdCrO3-x (II′)whereinLn is Y, an element numbered 57 to 71, or a mixture thereof;e is 0.95 to 1;d is 0.4 to 0.01; andx is a number such that formula (II) is uncharged and x is 0≤x≤0.5. 4. A membrane as claimed in claim 1, wherein the membrane is coated on both sides with a porous electron conducting coating or a dense hydrogen permeable coating. 5. A membrane as claimed in claim 4, wherein the porous electron conducting coating is a single phase material selected from a metal, metal-based alloy or a ceramic compound. 6. A membrane as claimed in claim 4, wherein the porous electron conducting coating is Ni or Pt. 7. A membrane as claimed in claim 4, wherein the porous conducting coating has a thickness of less than 10 microns. 8. A membrane as claimed in claim 1, wherein the conducting layer is less than 100 microns in thickness. 9. A membrane as claimed in claim 1, wherein the ratio of component (i) to component (ii) is about 1:1. 10. A membrane as claimed in claim 1, wherein the particle size of components (i) and (ii) is less than 5 microns. 11. A proton conducting membrane reactor comprising a dehydrogenation catalyst and a proton conducting membrane as defined in claim 1. 12. A reactor comprising a first zone comprising a dehydrogenation catalyst and a second zone separated from said first zone by a proton conducting membrane as defined in claim 1. 13. A process for the dehydrogenation of substance, comprising introducing said substance into the first zone of a reactor as defined in claim 12 thereby dehydrogenate said substance; allowing hydrogen formed during said dehydrogenation to pass through said proton conducting membrane into said second zone;introducing a purge gas into said second zone, to react with the hydrogen; orapplying reduced pressure in said second zone to thus remove hydrogen from said second zone.
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이 특허에 인용된 특허 (2)
Hying, Christian; Horpel, Gerhard; Penth, Bernd, Ion-conducting composite which is permeable to matter, method for producing said composite, and use of the same.
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