Proton conducting membranes for hydrogen production and separation
AssigneeUniversity of Florida Research Foundation, Inc.
InventorsERIC D. WACHSMAN, HEE SUNG YOON, TAKKEUN OH, JIANLIN LI
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Abstract
In one embodiment, a membrane of proton-electron conducting ceramics that is useful for the conversion of a hydrocarbon and steam to hydrogen has a porous support coated with a film of a Perovskite-type oxide. By including the Zr and M in the oxide in place of Ce, the stability can be improved while maintaining sufficient hydrogen flux for efficient generation of hydrogen. In this manner, the conversion can be carried out by performing steam methane reforming (SMR) and/or water-gas shift reactions (WGS) at high temperature, where the conversion of CO to CO2 and H2 is driven by the removal of H2 to give high conversions.
Claims29
A membrane of proton-electron conducting ceramics comprising:
- a porous support comprising:
- M′-Sr1-z′M″z′Ce1-x′-y′Zrx′M′″y′O3-δ, Al2O3, mullite, ZrO2, CeO2 or any mixtures thereof where:
- M′ is Ni, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Zn, Pt, Ru, Rh, Pd, alloys thereof or mixtures thereof;
- M″ is Ba, Ca, Mg, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb;
- M′″ is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb;
- z′ is 0 to about 0.5;
- x′ is 0 to about 0.5;
- y′ is 0 to about 0.5;
- and x′+y′>0;
- and
- a film comprising a Perovskite-type oxide of the formula SrCe1-x-yZrxMyO3-δ where:
- M is at least one of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb;
- x is 0.1 to about 0.2 and y is about 0.1 to about 0.3;
- and at least one of said M is Eu;
- or
- a porous support comprising:
- M′-Sr1-z′M″z′Ce1-x′-y′Zrx′M′″y′O3-δ, CeO2 or any mixtures thereof where:
- M′ is Ni, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Zn, Pt, Ru, Rh, Pd, alloys thereof or mixtures thereof;
- M″ is Ba, Ca, Mg, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb;
- M′″ is Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, or Yb;
- z′ is 0 to about 0.5;
- x′ is 0 to about 0.5;
- y′ is 0 to about 0.5;
- and x′+y′>0;
- and
- a film comprising a Perovskite-type oxide of the formula SrCe1-x-yZrxMyO3-δ where:
- M is at least one of Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Nb, Mo, W, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb;
- x is 0 to about 0.15 and y is about 0.1 to about 0.3;
- and at least one of said M is Eu on a surface of said porous support.
Dependencies are inferred from the claim text.