Electro-catalysts for the oxidation of ammonia in alkaline...

Details Electro-catalysts for the oxidation of ammonia in alkaline... Electro-catalysts for the oxidation of ammonia in alkaline...

C - Chemistry, Metallurgy

25

B

C25B 9/00 (2006.01) C02F 1/461 (2006.01) C25B 11/00 (2006.01) C25B 11/04 (2006.01) H01M 4/36 (2006.01) H01M 4/86 (2006.01) H01M 8/00 (2006.01)

Patent

CA 2542313

An electro-catalyst for the oxidation of ammonia in alkaline media; the electrocatalyst being a noble metal co-deposited on a support with one or more other metals that are active to ammonia oxidation. In some embodiments, the support is platinum, gold, tantalum, or iridium. In some embodiments, the support has a layer of Raney metal deposited thereon prior to the deposition of the catalyst. Also provided are electrodes having the electro-catalyst deposited thereon, ammonia electrolytic cells, ammonia fuel cells, ammonia sensors, and a method for removing ammonia contaminants from a contaminated effluent.

L'invention concerne un électrocatalyseur d'oxydation de l'ammoniac dans des milieux alcalins. L'électrocatalyseur est un métal précieux couché sur un support par dépôt simultané avec un ou plusieurs autres métaux activant l'oxydation de l'ammoniac. Dans certains modes de réalisation, le support est platine, or, tantale ou iridium. Dans d'autres modes de réalisation, une couche de métal de Raney est déposée sur le support préalablement au dépôt du catalyseur. On décrit également des électrodes sur lesquelles l'électrocatalyseur est déposé, des cellules électrolytiques d'ammoniac, des piles à combustible d'ammoniac, des détecteurs d'ammoniac. On décrit en outre un procédé d'élimination de contaminants d'ammoniac d'un effluent pollué.

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