Electrode for electrolytic evolution of gas

Patent metadata

Field	Value
Publication number	US-2025327200-A1
Application number	US-202318868246-A
Country	US
Kind code	A1
Filing date	Jul 6, 2023
Priority date	Jul 8, 2022
Publication date	Oct 23, 2025
Grant date	—

Abstract

An electrode for gas evolution in electrolytic processes comprising a catalytic coating containing oxides of tin, ruthenium, titanium and one or more elements selected from the group consisting of niobium, tantalum and tungsten applied to a metallic substrate, and a method for its preparation.

First claim

1 . An electrode for gas evolution in electrolytic processes comprising a metal substrate and a catalytic coating said catalytic coating comprising tin, ruthenium, titanium and one or more elements selected from the group consisting of niobium, tantalum, tungsten wherein tin is 10-20%, ruthenium is 25-45%, titanium is 20-40%, and one or more elements selected from the group consisting of niobium, tantalum, tungsten is 10-20% in the form of metals or their oxides in percentage by weight referred to the elements.

2 . The electrode according to claim 1 wherein said one or more elements selected from the group consisting of niobium, tantalum, tungsten is tantalum.

3 . The electrode according to claim 1 wherein the titanium of said catalytic coating is present in the form of oxide in the rutile form.

4 . The electrode according to claim 1 wherein the catalytic coating has a ruthenium load comprised between 2.2 and 9 g/m 2 .

5 . A method for the production of an electrode as defined in claim 1 , comprising the following steps:
a) applying to a metal substrate a solution comprising the precursors of ruthenium, tin, titanium and one or more elements selected from the group consisting of niobium, tantalum, tungsten, 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 load of ruthenium comprised between 0.4 and 1.2 g/m 2 ; b) repeating step a) until obtaining a catalytic coating with a specific load of ruthenium comprised between 2.2 and 9 g/m 2 ; c) thermally treating at 450-600° C. for a time of 50 to 200 minutes.

6 . A cell for the electrolysis of alkaline chloride solutions and/or for electro-chlorination comprising an anodic compartment and a cathodic compartment wherein the anodic compartment is equipped with the electrode according to claim 1 .

7 . The cell for electrolysis and/or for electro-chlorination according to claim 6 wherein said anodic compartment and said cathodic compartment are separated by a diaphragm or an ion exchange membrane.

8 . An electrolyzer for the production of chlorine and alkali starting from alkali chloride solutions comprising a modular arrangement of cells according to claim 7 .

Assignees

• Industrie De Nora Spa

Inventors

• Ramunni Anna
• Sala Fabio

Classifications

• C25B1/46 Primary

  in diaphragm cells · CPC title

• C25B9/19

  with diaphragms · CPC title

• C25B1/50

  Processes · CPC title

• C25B11/061

  Metal or alloy · CPC title

• C25B11/093 Primary

  at least one noble metal or noble metal oxide and at least one non-noble metal oxide · CPC title