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US 12,448,693 B2Granted
Anode for electrolytic evolution of chlorine
AssigneeIndustrie De Nora S.P.A.
InventorsAlice Gargiulo, Alice Calderara, Luciano Iacopetti
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Abstract
The invention relates to a process for obtaining a electrode usable as a anode in electrolytic cells for the production of chlorine. The electrode thus obtained comprises a catalytic layer containing oxides of tin, ruthenium, iridium and titanium applied to a substrate of a valve metal.
Claims9
A method for the production of an electrode comprising the following steps:
- a) applying to a valve metal substrate an acetic solution consisting of hydroxyacetochloride complexes of iridium, ruthenium, tin and titanium, subsequent drying at 50-60° C. and thermal decomposition at 450-600° C. for a time of 5 to 30 minutes until reaching a specific noble metal loading expressed as the sum of iridium and ruthenium between 0.4 and 1 g/m2;
- followed by
- b) repeating step a) until obtaining a catalytic coating with a specific noble metal loading of 6 to 12 g/m2;
- and thereafter
- c) heat treating at 450-600° C. for a time of 50 to 200 minutes.
2 more elements
A method for the production of an electrode for gas evolution in electrolytic processes comprising the following steps:
- a) applying to a valve metal substrate an acetic solution consisting of hydroxyacetochloride complexes of iridium, ruthenium, tin and titanium complexes containing 5-40% of tin, 3.6-15% of iridium, 18-40% of ruthenium and 30-70% of titanium, in molar percentage referred to the elements;
- subsequent drying at 50-60° C. and thermal decomposition at 450-600° C. for a time of 5 to 30 minutes until reaching a specific noble metal loading expressed as the sum of iridium and ruthenium of 0.4 to 1 g/m2;
- followed by
- b) repeating step a) until obtaining a catalytic coating with a specific noble metal loading of 6 to 12 g/m2;
- and thereafter
- c) heat treating at 450-600° C. for a time of 50 to 200 minutes.
3 more elements
A method for the production of an electrode comprising the following steps:
- a) applying to a valve metal substrate an acetic solution consisting of hydroxyacetochloride complexes of iridium, ruthenium, tin and titanium, subsequent drying at 50-60° C. and thermal decomposition at 450-600° C. for a time of 5 to 30 minutes until reaching a specific noble metal loading expressed as the sum of iridium and ruthenium between 0.4 and 1 g/m2;
- followed by
- b) repeating step a) until obtaining a catalytic coating with a specific noble metal loading of 6 to 12 g/m2;
- and thereafter
- c) heat treating at 450-600° C. for a time of 50 to 200 minutes, thereby obtaining the electrode comprising the valve metal substrate and the catalytic coating containing 5-40% of tin, 3.6-15% of iridium, 18-40% of ruthenium and 30-70% of titanium, in the form of metals or their oxides in molar percentage referred to the elements.
2 more elements
Dependencies are inferred from the claim text.