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A kind of method for preparing iridium nitrate solution

A technology of iridium nitrate and solution, which is applied in the field of preparation of noble metal catalysts, and can solve the problems that the synthesis method has not been reported yet.

Active Publication Date: 2020-10-16
泸西县扩铂贵金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Nitrate compounds of noble metals have been used more and more in recent years because they do not contain chloride ions and are easy to dissolve, and their synthetic methods have not been reported yet.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 10 grams of ammonium chloroiridate, add 40 ml of aqua regia, filter to remove a small amount of insoluble matter after all dissolved, add 4.5 grams of potassium chloride at 55 ° C, react for 3 hours, filter the obtained solid, wash with water 3 times and then dry to obtain 9.86 grams of potassium chloroiridate solid. After the potassium chloroiridate was stirred into a suspension in 100 ml of purified water, 5 grams of potassium hydroxide was added, and the reaction was carried out at 75° C. until a large amount of dark blue solid appeared. After filtering and washing the dark blue solid for 3 times and drying, according to the ratio of iridium hydroxide (mol):nitric acid (mol)=1:3, dissolve it with 10% nitric acid solution to make iridium nitrate solution, and the residual chloride ion is less than 3ppm .

Embodiment 2

[0019] Weigh 100 grams of ammonium chloroiridate, add 400 ml of aqua regia, filter to remove a small amount of insoluble matter after dissolving all, add 50 grams of potassium chloride at 55 ° C, react for 3.5 hours, filter the obtained solid, wash with water 3 times and then dry to obtain 99 grams of potassium chloroiridate solid. After the potassium chloroiridate was stirred into a suspension in 1000 ml of purified water, 50 grams of potassium hydroxide was added, and the reaction was carried out at 70° C. until a large amount of dark blue solid appeared. After filtering and washing the dark blue solid for 3 times and drying, according to the ratio of iridium hydroxide (mol):nitric acid (mol)=1:3.1, dissolve it with 10% nitric acid solution to make iridium nitrate solution, and the residual chloride ion is less than 3ppm .

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Abstract

The invention discloses a method for preparing an iridium nitrate solution, and aims to provide a convenient method for preparing a cerium nitrate solution. The method comprises the following steps: (1) preparing potassium chloroiridate from ammonium chloroiridate; (2) performing a reaction on the prepared potassium chloroiridate with potassium hydroxide so as to form iridium hydroxide; and (3) dissolving the prepared iridium hydroxide in nitric acid so as to prepare the iridium nitrate solution. The prepared iridium nitrate solution has low residual content of chlorine ions, and has better high temperature resistance and long service life.

Description

technical field [0001] The invention relates to the technical field of precious metal catalyst preparation, in particular to a method for preparing iridium nitrate solution. Background technique [0002] Precious metal catalysts are widely used in exhaust gas treatment, organic synthesis and other fields. Precious metal catalysts are expensive and difficult to prepare. How to reduce the usage amount, increase the catalytic activity and improve the reuse rate is the focus of current research. Studies have shown that chlorine-free noble metal catalysts have significant catalytic advantages compared to chlorine-containing noble metal catalysts. When the two catalysts are aged, the catalytic activity of the chlorine-containing catalyst will be greatly reduced, and the chlorine will reduce the high temperature resistance and service life of the catalyst. [0003] Iridium catalysts are widely used in the preparation of hydrazine decomposition catalysts, automobile exhaust gas pur...

Claims

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Application Information

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IPC IPC(8): C01G55/00B01J23/46
CPCB01J23/468C01G55/00
Inventor 王吴韬王成成张喜王翠萍段世雄
Owner 泸西县扩铂贵金属有限公司
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