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Anode for electrolytic evolution of chlorine

A technology of electrodes and electrolyzers, applied in the field of electrodes, can solve problems such as chlorine pollution and reduce overvoltage

Active Publication Date: 2013-07-17
IND DE NORA SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adding a certain amount of second noble metal selected from iridium and platinum to the base mixed with SnO 2 RuO 2 formulations (eg as disclosed in EP0153586), a partial improvement in chlorine overvoltage and thus overall process voltage and energy consumption can be obtained; however, this formulation and other tin-containing formulations show simultaneous Also reduces the problem of overvoltage of the coexisting oxygen evolution reaction, thus the chlorine produced by the anodic reaction is contaminated by excess oxygen

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A 10 cm x 10 cm size titanium mesh sheet was blasted with corundum, and the residue was cleaned with a jet of compressed air. The sheet was then degreased using acetone in an ultrasonic bath for about 10 minutes. After drying, the sheet was dipped at about 100°C in a solution containing 250 g / l NaOH and 50 g / l KNO 3 in aqueous solution for about 1 hour. After alkaline treatment, the sheet was rinsed three times in deionized water at 60°C, changing the liquid each time. Add a small amount of HCl (approximately 1 ml per liter of solution) for a final rinse. Then it was air dried and due to the thin TiO x A brown-toned appearance was observed as the film grew.

[0017] 100 ml of a first hydroalcoholic solution comprising RuCl in a mixture of water and 2-propanol acidified with HCl was prepared 3 ·3H 2 O, H 2 IrCl 6 ·6H 2 O, TiCl 3 , having a molar composition of 30% Ru, 20% Ir and 50% Ti in terms of metal.

[0018] 100 ml of a second hydroalcoholic solution comp...

Embodiment 2

[0024] A 10 cm x 10 cm size titanium mesh sheet was blasted with corundum, and the residue was cleaned with a jet of compressed air. The sheet was then degreased using acetone in an ultrasonic bath for about 10 minutes. After drying, the sheet was dipped at about 100°C in a solution containing 250 g / l NaOH and 50 g / l KNO 3 in aqueous solution for about 1 hour. After alkaline treatment, the sheet was rinsed three times in deionized water at 60°C, changing the liquid each time. Add a small amount of HCl (approximately 1 ml per liter of solution) for a final rinse. Then it was air dried and due to the thin TiO x A brown-toned appearance was observed as the film grew.

[0025] 100 ml of a first hydroalcoholic solution comprising RuCl in a mixture of water and 2-propanol acidified with HCl was then prepared 3 ·3H 2 O, H 2 IrCl 6 ·6H 2 O, n-butyl titanate Ti(III), H 2 PtCl 6 , has a molar composition of 16.5% Ru, 9% Ir, 1.5% Pt, and 73% Ti in terms of metal.

[0026] 100...

Embodiment 3

[0032]A 10 cm x 10 cm size titanium mesh sheet was blasted with corundum, and the residue was cleaned with a jet of compressed air. The sheet was then degreased using acetone in an ultrasonic bath for about 10 minutes. After drying, the sheet was dipped at about 100°C in a solution containing 250 g / l NaOH and 50 g / l KNO 3 in aqueous solution for about 1 hour. After alkaline treatment, the sheet was rinsed three times in deionized water at 60°C, changing the liquid each time. Add a small amount of HCl (approximately 1 ml per liter of solution) for a final rinse. Then it was air dried and due to the thin TiO x A brown-toned appearance was observed as the film grew.

[0033] 100 ml of a first hydroalcoholic solution comprising RuCl in a mixture of water and 1-butanol acidified with HCl was then prepared 3 ·3H 2 O, H 2 IrCl 6 ·6H 2 O, TiOCl 2 , has a molar composition of 17% Ru, 10% Ir, and 73% Ti in terms of metal.

[0034] 100 ml of a second hydroalcoholic solution co...

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PUM

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Abstract

An electrode suitable for chlorine evolution in electrolysis cells consists of a metal substrate coated with two distinct compositions applied in alternate layers, the former comprising oxides of iridium, ruthenium and valve metals, for instance tantalum, and the latter comprising oxides of iridium, ruthenium and tin. The thus-obtained electrode couples excellent characteristics of anodic potential and selectivity towards the chlorine evolution reaction.

Description

technical field [0001] The present invention relates to electrodes suitable for use as anodes in electrolytic cells, for example for chlorine evolution in chlor-alkali electrolytic cells. Background technique [0002] Titanium or other ruthenium dioxide (RuO 2 ) surface layer (which has the property of reducing the overvoltage of the chlorine evolution anodic reaction) activated other valve metal based anodes for the electrolysis of alkali metal chloride brines such as sodium chloride brines for the production of chlorine and caustic soda. A typical catalyst formulation for chlorine evolution is, for example, composed of a catalyst with optionally added IrO 2 RuO 2 and TiO 2 The composition of the mixture is characterized by a considerably reduced, though not optimal, anodic overvoltage for chlorine evolution. By adding a certain amount of second noble metal selected from iridium and platinum to the base mixed with SnO 2 RuO 2 formulations (eg as disclosed in EP0153586...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/04
CPCC25B11/0484C25B11/093C25B9/00C25B11/063C25B1/26
Inventor C·乌尔杰盖C·佩佐尼A·L·安托齐
Owner IND DE NORA SPA