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Method for directly preparing catalyst by using precious metal scraps

A precious metal catalyst and precious metal technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problem of high price of high-purity precious metals, achieve high catalytic activity, low material consumption and energy consumption, and realize recycling The effect of using

Active Publication Date: 2018-11-30
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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Problems solved by technology

[0006] Aiming at the problems of long recovery process of precious metals and high price of high-purity precious metals required for catalyst preparation, the present invention provides a short process method for directly preparing catalysts from precious metal waste, which not only economically and effectively realizes the recycling of precious metals, but also greatly reduces The material consumption, energy consumption and pollutant discharge in the traditional catalyst preparation process "precious metal extraction-refining-processing-catalyst" have significant economic and environmental benefits

Method used

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  • Method for directly preparing catalyst by using precious metal scraps

Examples

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Embodiment 1

[0024] The scrapped automobile catalyst is crushed, roasted, reduced to remove carbon deposits and activated. Prepare precious metal oxidation complexing agent: sodium chlorate 20g / L, hydrochloric acid 2.0mol / L, sodium chloride 4.0mol / L. Stir and heat the reduced spent catalyst and oxidizing complexing agent to 90° C., react for 4 hours, and then filter to obtain filter residue and precious metal complex filtrate. Use 732-type cation exchange resin to adsorb metal cations in the noble metal complex filtrate to obtain a noble metal complex solution. The concentration of metal cations in the noble metal complex solution is 92 mg / L, and the noble metal is present in the noble metal complex as an anion complex. in the compound solution. Then put the cordierite carrier in the noble metal complex solution for ultrasonic impregnation for 30 min, then take it out and dry it at 120° C. for 4 h. After drying, the loaded amount of noble metal on the carrier was detected to be 2138g / t, ...

Embodiment 2

[0026] The spent petroleum reforming catalyst is crushed, roasted, reduced to remove carbon deposits and activated. Preparation of noble metal oxidation complexing agent: hydrogen peroxide volume fraction 1.0%, hydrochloric acid 1.0 mol / L, potassium chloride 5.0 mol / L. Stir and heat the reduced spent catalyst and oxidizing complexing agent to 90° C., react for 2 hours, and then filter to obtain filter residue and precious metal complex filtrate. Use D001 type cation exchange resin to adsorb metal cations in the metal complex filtrate, the concentration of metal cations in the noble metal complex solution is 62 mg / L, and the noble metal exists in the metal complex solution as an anion complex. Then γ-Al 2 o 3 After the carrier was placed in the noble metal complex solution for ultrasonic impregnation for 50 min, it was taken out and dried at 110° C. for 6 h. After drying, the loaded amount of noble metal on the carrier was detected to be 3489g / t, meeting the catalyst require...

Embodiment 3

[0028] The waste petroleum hydrogenation catalyst is crushed, roasted, reduced to remove carbon deposits and activated. Prepare precious metal oxidation complexing agent: sodium chlorate 40g / L, sulfuric acid 1.0mol / L, potassium chloride 5.0mol / L. Stir and heat the reduced spent catalyst and oxidizing complexing agent to 90° C., react for 2 hours, and then filter to obtain filter residue and metal complex filtrate. Use D113 type cation exchange resin to adsorb the metal cations in the metal complex filtrate, the metal cation concentration in the noble metal complex solution is 35mg / L, and the noble metal is present in the described noble metal complex solution as an anion complex. Then put the zeolite carrier in the noble metal complex solution for ultrasonic impregnation for 60 min, then take it out and dry it at 100° C. for 8 h. After drying, the loaded amount of precious metal on the carrier was detected to be 4220g / t, meeting the requirements of the catalyst. Finally, the...

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Abstract

The invention belongs to the technical field of precious metal scraps, and relates to a method for directly preparing a catalyst by using precious metal scraps. The method comprises the following steps: firstly, performing preprocessing including ball milling, roasting, reduction and the like on the precious metal scraps; then oxidizing and complexing precious metal in an acidic medium; selectively adsorbing metal cations in precious metal complex filtrate by using cationic resin; putting a catalyst carrier into the precious metal complex solution to perform ultrasonic impregnation; drying thecatalyst after ultrasonic impregnation and introducing hydrogen to perform reduction on precious metal ions so as to obtain the precious metal catalyst. According to the method disclosed by the invention, by using the precious metal scraps as raw materials, cationic exchange resin is subjected to impurity removal so as to directly prepare the precious metal catalyst. The method has the advantagesof short processes, economy, environmental protection and the like, and is suitable for industrial application.

Description

technical field [0001] The invention mainly belongs to the technical field of regenerated precious metals, and in particular relates to a method for directly preparing catalysts from waste precious metals. Background technique [0002] Precious metals mainly refer to gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium, platinum) and other 8 metal elements, which have important strategic significance and are known as "modern industrial vitamins". Precious metals are mainly produced in South Africa, Russia, the United States, Canada, Australia, Zimbabwe and other countries, especially platinum group metals. The resource reserves of the above countries account for about 99% of the world's reserves. my country's reserves of precious metals are scarce. The reserves of platinum group metals are less than 400 tons. The annual output of platinum and palladium is only 3 tons, which is only 2.14% of the demand. The dependence on foreign countries is ...

Claims

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Application Information

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IPC IPC(8): B01J37/18
CPCB01J37/18
Inventor 张深根丁云集刘波
Owner UNIV OF SCI & TECH BEIJING
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