Electrode for Electrolysis Cell
AssigneeIndustrie De Nora S.P.A.
InventorsChristian Urgeghe, Alexander Morozov, Alice Calderara, Dino Floriano Di Franco, Antonio Lorenzo Antozzi
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Abstract
The invention relates to an electrode formulation comprising a catalytic layer containing tin, ruthenium, iridium, palladium and niobium oxides applied to a titanium or other valve metal substrate. A protective layer based on titanium oxide modified with oxides of other elements such as tantalum, niobium or bismuth may be interposed between the substrate and the catalytic layer. The thus obtained electrode is suitable for use as an anode in electrolysis cells for chlorine production.
Claims10
Electrode suitable for operating as an anode in electrolysis cells comprising a valve metal substrate and an external catalytic layer containing oxides of tin, ruthenium, iridium, palladium and niobium in a Sn 50-70%, Ru 5-20%, Ir 5-20%, Pd 1-10%, Nb 0.5-5% elementary molar ratio.
A method for manufacturing an electrode, comprising:
- applying multiple coats of a precursor solution containing Sn, Ir and Ru hydroxyacetochloride complexes, at least one Pd soluble species and at least one Nb soluble species to a valve metal substrate;
- and
- executing after each coat a thermal treatment at a maximum temperature of 400° C. to 480° C. for a duration of 15 to 30 minutes.
A method for manufacturing an electrode, comprising:
- applying multiple coats of a first hydroalcoholic solution containing a titanium hydroxyacetochloride complex and at least one salt of titanium, niobium or bismuth to a valve metal substrate with execution after each coat of a thermal treatment at a maximum temperature of 400 to 480° C. for a duration of 15 to 30 minutes;
- and
- applying multiple coats of a second hydroalcoholic solution containing Sn, Ir and Ru hydroxyacetochloride complexes, at least one Pd soluble species and at least one Nb soluble species with execution after each coat of a thermal treatment at a maximum temperature of 400 to 480° C. for a duration of 15 to 30 minutes.
An electrolysis cell comprising a cathodic compartment containing a cathode and an anodic compartment containing an anode separated by a membrane or diaphragm, the anodic compartment being fed with an alkali chloride brine, wherein the anode of the anodic compartment comprises an electrode comprising a valve metal substrate and an external catalytic layer containing oxides of tin, ruthenium, iridium, palladium and niobium in a Sn 50-70%, Ru 5-20%, Ir 5-20%, Pd 1-10%, Nb 0.5-5% elementary molar ratio.
Dependencies are inferred from the claim text.