Electrode for producing chlorine through electrolysis

An electrode, conductivity technology, applied in the field of new electrodes, can solve problems such as low stability

Inactive Publication Date: 2012-05-23
BAYER MATERIALSCIENCE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some coating solutions made in this way have low stability due to premature reprecipitation of the less soluble components (especially at high concentrations)

Method used

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  • Electrode for producing chlorine through electrolysis
  • Electrode for producing chlorine through electrolysis
  • Electrode for producing chlorine through electrolysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0092] A titanium plate with a diameter of 15 mm (thickness 2 mm) was blasted to clean and roughen the surface, followed by pickling (2 h) in 10% oxalic acid at 80 °C, followed by cleaning with isopropanol and Dry in a stream of nitrogen.

[0093] To make the coating solution, 99.6 mg of ruthenium acetylacetonate (Ru(acac) 3 ), 207.2 μl of titanium isopropoxide (Ti(i-OPr) 4 ) and 13.3 mg of vanadyl acetylacetonate (VO(acac) 2 ) were each dissolved in 1.45 ml of isopropanol and 1.45 ml of propionic acid and heated at reflux for 30 minutes. After cooling to room temperature, the three solutions were mixed to produce a homogeneous and clear solution with a wine red color. 50 μl of this coating solution was applied to the titanium substrate by micropipette, followed by air drying. The layer was first sintered in air at 250° C. for 10 minutes and then at 450° C. for 10 minutes. These steps (coating solution application, drying, sintering) were repeated 8 times. After the nint...

Embodiment 1b

[0095] Embodiment 1b (comparative example)

[0096] The titanium substrate was pretreated in a manner similar to Example 1.

[0097] To fabricate a coating by thermal decomposition, fabricate containing 2.00 g of ruthenium(III) chloride hydrate (Ru content = 40.5 wt%), 21.56 g of n-butanol, 0.94 g of concentrated hydrochloric acid and 5.93 g of tetrabutyltitanium Salt Ti-(O-Bu) 4 ) coating solution. A portion of the coating solution was applied to a small titanium plate by brush. It was dried in air at 80°C for 10 minutes and then treated in air at 470°C for 10 minutes. This step (solution application, drying, heat treatment) was carried out a total of 8 times. The plate was then treated in air at 520° C. for 1 hour. Ruthenium loading per unit area calculated from coating solution consumption is 16 g / m 2 , equivalent to 31 mol% RuO 2 and 69 mol% TiO 2 The total coating loading is 49.2 g / m at the composition of 2 (calculated as oxides).

[0098] The chlorine evolut...

Embodiment 2

[0100] The titanium substrate was pretreated in a manner similar to Example 1.

[0101] 60 mg of ruthenium acetylacetonate (Ru(acac) 3 ), 236.8 μl of titanium isopropoxide (Ti(i-OPr) 4 ) and 13.3 mg of vanadyl acetylacetonate (VO(acac) 2 ) were each dissolved in 1.45 ml of isopropanol and 1.45 ml of propionic acid, followed by heating (with stirring) at 150° C. under reflux for 30 minutes. After cooling to room temperature, the three solutions were mixed to produce a homogeneous and clear solution with a wine red color. The coating and sintering steps were performed as described in Example 1.

[0102] This yielded a sample with a composition of 15 mol% Ru / 80 mol% Ti / 5 mol% V based on the metal constituents. Based on metal content, this equates to 3.9 g / m 2 ruthenium loading. This corresponds to 22.7 g / m 2 The total coating loading (oxide RuO 2 、TiO 2 , V 2 o 2 Sum).

[0103] The chlorine evolution potential of this sample (measured in a similar manner to Example 1)...

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Abstract

The present invention relates to an electrode comprising an electrically conductive substrate and a catalytically active layer, wherein the catalytically active layer is based on two catalytically active components and comprises iridium, ruthenium or titanium as metal oxide or mixed oxide or mixtures of the oxides, wherein the total content of ruthenium and/or iridium based on the sum of the elements iridium, ruthenium and titanium is at least 10 mol %, and wherein the electrode comprises at least one oxidic base layer which is applied to the electrically conductive substrate and is impermeable to aqueous electrolytes comprising NaCl and/or NaOH and/or HCl.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of German Patent Application No. 10 2010 043 085.4 filed on October 28, 2010, which is hereby incorporated by reference in its entirety for all useful purposes. technical field [0003] The present invention improves upon known electrodes containing noble metal catalysts for the electrolytic production of chlorine. The field of the invention relates to a method for preparing a catalyst coating for electrodes for improved chlorine recovery, the coating being applied to an electrically conductive support material, and to the novel electrodes obtainable by this method. The coating consists in particular of a dense and crack-free base layer and a highly porous cover layer. The base and cover layers consist, for example, of mixed oxides based on Ti, Ru or Ir and one or more doping elements from the transition metal series. Both layers are applied to an electrically conductive support by m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B11/06C25B1/26
CPCC25B1/26C25B11/0484C25B11/093
Inventor A.布兰J.金特鲁普R.韦伯陈瑞勇赵向荣H.纳特R.黑姆佩尔曼
Owner BAYER MATERIALSCIENCE AG
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