Compositions, methods, and apparatus for separating oxygen...

C - Chemistry – Metallurgy – 04 – B

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C04B 35/48 (2006.01) B01D 53/32 (2006.01) C04B 35/453 (2006.01) C04B 35/50 (2006.01) C25B 13/04 (2006.01) H01M 8/12 (2006.01)

Patent

CA 2124674

A solid ceramic composition provides high oxygen ion conductivity, and includes a metal oxide combined with multiple dopants. The oxide may, for example, include zirconia, bismuth trioxide, thoria or halfnia. The dopant oxides are chosen such that they are of similar ionic radius to the oxide, but such that they generally have different valences. It has been found that choosing the dopants such that they exist in the composition at specified ratios results in surprising ability to transport oxygen ions. Also disclosed are methods and apparatus for using the composition in removing oxygen and water from a mixture of gases. The doped ceramic composition (18) is formed into a tube (12) having electrodes (14, 16) coated thereon and is mounted in an insulated enclosure (24) which can be heated. Mixed gases flow through the tube (12) and oxygen is transported through the cylinder walls when an electrical potential is applied.

Composition céramique solide assurant une haute conductivité de l'ion oxygène; elle renferme un oxyde métallique combiné à de multiples dopants. L'oxyde peut par exemple comprendre de la zircone, du trioxyde de bismuth, de la thorine ou de l'hafnie. Les oxydes dopants sont choisis d'après leur rayon ionique, qui doit être semblable à celui de l'oxyde, mais généralement avec des valences différentes. On a constaté que la sélection des dopants, comme ils existent dans la composition, selon des proportions spécifiques, donne une capacité surprenante pour le transport des ions oxygènes. On présente également des méthodes et des appareils pour éliminer l'oxygène et l'eau dans un mélange de gaz grâce à cette composition. La composition céramique dopée (18) forme un tube (12) muni d'électrodes (14,16) par revêtement et monté dans un compartiment isolé (24), qui peut être chauffé. Lors de l'application d'une tension électrique, il y a flux de gaz mixtes à travers le tube (12) et transport d'oxygène à travers les parois du cylindre.

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