Electrode coating and its use in the production of chlorate

C - Chemistry – Metallurgy – 25 – B

Patent

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Details

C25B 11/04 (2006.01) C23C 30/00 (2006.01) C25B 1/26 (2006.01) C25B 11/06 (2006.01)

Patent

CA 2437457

An electrolytic cell producing sodium chlorate uses an electrode, specifically an anode, having a coating of a mixed metal oxide having ruthenium oxide as an electrocatalyst, a precious metal of the platinum group or its oxide as a stability enhancer, antimony oxide as an oxygen suppressant and a titanium oxide binder. The electrocatalytic coating is about 21 mole percent ruthenium oxide, about 2 mole percent iridium oxide, about 4 mole percent antimony oxide and the balance is titanium oxide. The coating is characterized by high durability and low oxygen content in an offgas.

L'invention concerne une cellule d'électrolyse produisant du chlorate de sodium. La cellule d'électrolyse utilise une électrode, précisément une anode, qui présente une surface ou enrobage ou traitement d'un mélange d'oxyde métallique comprenant un oxyde de ruthénium comme électro-catalyseur; un métal précieux du groupe platine ou son oxyde comme renforçateur de stabilité; un oxyde d'antimoine comme extincteur d'oxygène; et un agglomérant en oxyde de titane. L'enrobage électrocatalytique comprend environ 21 moles pour cent d'oxyde de ruthénium, environ 2 moles pour cent d'oxyde d'iridium, environ 4 moles pour cent d'oxyde d'antimoine, l'équilibre étant apporté par l'oxyde de titane. Cet enrobage est caractérisé par une durée de vie élevée et un dégagement gazeux à faible teneur en oxygène.

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