Mixed conducting cubic perovskite for ceramic ion transport...

Details Mixed conducting cubic perovskite for ceramic ion transport... Mixed conducting cubic perovskite for ceramic ion transport...

B - Operations, Transporting

01

D

B01D 71/02 (2006.01) B01D 53/22 (2006.01) B01D 61/30 (2006.01) B01D 63/02 (2006.01) B01D 65/00 (2006.01) C01B 13/02 (2006.01) C04B 35/01 (2006.01) C04B 35/50 (2006.01) C04B 38/00 (2006.01)

Patent

CA 2297578

A ceramic membrane element for an oxygen separator is formed from a ceramic material represented by the structure: A1-xA'x B 1-yB'y O 3-z where A is a lanthanide element; A' is a suitable lanthanide element dopant; B is selected from the group consisting of titanium, vanadium, chromium, manganese, iron, cobalt, nickel, zinc and mixtures thereof; B' is copper; x is between 0.4 and 0.8; y is between 0.1 and 0.9; and z is > 0 (and determined by stoichiometry). When B includes cobalt in an amount greater than 0.1, the included iron content is less than 0.05. The membrane element selectively transports oxygen ions therethrough at a relatively low temperature, with a flux detected at about 600°C. This enables the oxygen separator to be operated at lower temperatures than convention separators that frequently have operating temperatures in excess of 900°C. Mechanical stability may be enhanced by the addition of a second phase to the ceramic.

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