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Recovery method of noble metal catalyst

The technology of a precious metal catalyst and a recovery method, which is applied in the chemical field, can solve the problems of difficult operation, dangerous operation, strong corrosiveness of aqua regia, etc., and achieves the effect of simple operation steps and low cost.

Active Publication Date: 2014-08-06
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the method of using aqua regia to dissolve precious metals has many disadvantages. First, aqua regia is very toxic, and it is not easy to go out after the reaction, and the waste liquid is very harmful to the environment.
Secondly, the operation is dangerous. The use of aqua regia to dissolve precious metals needs to be carried out under the condition of heating the aqua regia. Aqua regia is extremely corrosive, so the operation is difficult

Method used

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  • Recovery method of noble metal catalyst
  • Recovery method of noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1) Use analytically pure methanol, 36% hydrochloric acid, and water as preparation materials, prepare a mixed solution according to the ratio of methanol: hydrochloric acid = 4:1, and mix well.

[0037] 2) Put the mixed solution in a glass pressure-resistant test tube, tightly cap the bottle, and heat in an oil bath at 150°C for three hours. Cool to room temperature and place in the refrigerator.

[0038] 3) Put the test tube in 2) into liquid nitrogen to freeze, add platinum nanoparticles, cap the bottle tightly, return the temperature to room temperature, put it in an oil bath and heat it to 150°C for three hours to obtain platinum precious metal nanoparticles dissolved on the surface. particle.

[0039] 4) Heating in an oil bath to 180° C. and heating for one hour to obtain platinum noble metal nanoparticles.

[0040] Such as figure 1 As shown, after the dissolution reaction, the unique absorption peak of platinum ions at 260 nm appeared in the solution, which ind...

Embodiment 2

[0042] 1) Use analytically pure methanol, 36% hydrochloric acid, and water as preparation materials, prepare a mixed solution according to the ratio of methanol: hydrochloric acid = 4:1, and mix well.

[0043] 2) Put the mixed solution in a glass pressure-resistant test tube, tightly cap the bottle, and heat in an oil bath at 150°C for three hours. Cool to room temperature and place in the refrigerator.

[0044] 3) Put the test tube in 2) into liquid nitrogen to freeze, add gold nanoparticles, cap the bottle tightly, return the temperature to room temperature, put it in an oil bath and heat it to 150°C for three hours to obtain gold nanoparticles dissolved on the surface .

[0045] 4) Heating in an oil bath to 180° C., and heating for one hour to obtain precious metal gold nanoparticles.

[0046] Such as figure 2 As shown, after the dissolution reaction, the ultraviolet absorption peak of the gold nanoparticles at 520 disappeared, indicating that the atomic state of gold h...

Embodiment 3

[0048] 1) Use analytically pure methanol, 36% hydrochloric acid, and water as preparation materials, prepare a mixed solution according to the ratio of methanol: hydrochloric acid = 2:1, and mix well.

[0049] 2) Put the mixed solution in a glass pressure-resistant test tube, tightly cap the bottle, and heat in an oil bath at 150°C for three hours. Cool to room temperature and place in the refrigerator.

[0050] 3) Put the test tube in 2) into liquid nitrogen to freeze, add platinum nanoparticles, cap the bottle tightly, return the temperature to room temperature, put it in an oil bath and heat it to 150°C for three hours to obtain platinum nanoparticles dissolved on the surface .

[0051] 4) Heating in an oil bath to 180° C. for one hour to obtain noble metal platinum nanoparticles.

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Abstract

The invention provides a recovery method of a noble metal catalyst. The recovery method comprises the following steps of: adding the noble metal catalyst to a methanol and hydrochloric acid mixed solution for reaction, thus obtaining a mixed solution with the noble metal catalyst dissolved; and heating the mixed solution with the noble metal catalyst dissolved obtained from the first step to generate reduction reaction, thus obtaining the reduced noble metal catalyst. The recovery method provided by the invention is environment-friendly and nontoxic, has a high recovery rate, and is simple to operate.

Description

technical field [0001] The invention relates to the field of chemistry and specifically designs a precious metal planning and recovery method. Background technique [0002] As important industrial catalysts, precious metal catalysts such as platinum, gold, and silver play an irreplaceable role in industrial development. At present, platinum catalysts are used for ammonia oxidation to produce nitric acid, Ag / Al2O3 catalysts are used for ethylene oxidation to produce ethylene oxide, gold particles catalyze the oxidation of carbon monoxide, etc. The applications of precious metal catalysts in the field of industrial catalysis are too numerous to mention. However, precious metal resources are scarce, expensive, and easily poisoned and deactivated during the catalytic process, resulting in certain limitations in their application. Therefore, how to recover and regenerate precious metal catalysts has become an important direction in the research of precious metal catalysts. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/96B01J23/52B01J23/42B01J23/44B01J38/60B01J38/02
Inventor 徐维林张玉微邢巍孙秀娟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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