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A method for recovering precious metals in waste carbon-supported precious metal catalysts by utilizing ionic liquids

A technology of noble metal catalysts and ionic liquids, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as unsatisfactory leaching rates, and avoid strong oxidants efficient use, less resource waste, and less environmental impact

Active Publication Date: 2021-07-27
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the leaching rate of this method is still unsatisfactory

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Au / C catalysts with a loading capacity (relative to carrier mass) of 3wt% were prepared by the method of the literature [Functional Materials, 2012, 43:222-225]. The carrier is columnar activated carbon with a particle size of 50 mesh and an ash content of 3.0wt. %, specific surface area 1200m 2 / g, pore volume 1.0mL / g, the catalyst is used to catalyze the oxidation reaction of ethylene glycol and becomes a spent catalyst.

[0040]Take 1g of the above-mentioned Au / C catalyst, mix it with ionic liquid tributylmonomethylammonium chloride at a mass ratio of 1:5, pass in hydrogen chloride gas with a flow rate of 5ml / min, and heat it to 70°C and keep it at 80r / min Speed ​​stirring for 24h. After the ionic liquid fully extracts the precious metal, it is cooled to room temperature; then the mixture of catalyst and ionic liquid is transferred to a Soxhlet extraction device, and solvent ethanol with a mass ratio of 10:1 to the ionic liquid is added, and Soxhlet extraction is ca...

Embodiment 2

[0042] Au / C catalyst with loading capacity (relative to carrier mass) of 1wt% was prepared by the method of literature [Functional Materials, 2012, 43:222-225]. The carrier is columnar activated carbon with a particle size of 50 mesh and an ash content of 3.0wt. %, specific surface area 1200m 2 / g, pore volume 1.0mL / g, the catalyst is used to catalyze the oxidation reaction of ethylene glycol and becomes a spent catalyst.

[0043] Take 2g of the above-mentioned Au / C catalyst, mix it with the ionic liquid 1-ethyl-3-methylimidazolium chloride at a mass ratio of 1:5, pass in hydrogen chloride gas with a flow rate of 3ml / min, and heat to 50°C, keep Stir at a rate of 80r / min for 12h. After the ionic liquid fully extracts the precious metal, it is cooled to room temperature; then the mixture of catalyst and ionic liquid is transferred to a Soxhlet extraction device, and acetonitrile, a solvent with a mass ratio of 10:1 to the ionic liquid, is added, and Soxhlet extraction is perfor...

Embodiment 3

[0045] Au / C catalysts with a loading capacity (relative to carrier mass) of 5wt% were prepared by the method of the literature [Functional Materials, 2012, 43:222-225]. The carrier is columnar activated carbon with a particle size of 50 mesh and an ash content of 3.0wt %, specific surface area 1200m 2 / g, pore volume 1.0mL / g, the catalyst is used to catalyze the oxidation reaction of ethylene glycol and becomes a spent catalyst.

[0046] Take 2g of the above-mentioned Au / C catalyst, mix it with ionic liquid tributylmonomethylammonium bromide at a mass ratio of 1:3, pass in hydrogen chloride gas with a flow rate of 7ml / min, heat to 80°C, and keep at 80r / min The speed was stirred for 48h. After the ionic liquid fully extracts the precious metal, it is cooled to room temperature; then the mixture of the catalyst and the ionic liquid is transferred to a Soxhlet extraction device, and acetone, a solvent with a mass ratio of 15:1 to the ionic liquid, is added, and Soxhlet extractio...

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Abstract

A method for recovering precious metals in waste carbon-supported catalysts by utilizing ionic liquids, the method comprising: (1) putting waste carbon-supported noble metal catalysts into ionic liquids, introducing hydrogen chloride gas and heating up to 50-200° C. under hydrogen chloride atmosphere, Insulate and stir so that the ionic liquid can fully extract the precious metal components on the surface of the catalyst carrier; then cool to room temperature to obtain the mixture; (2) The mixture obtained in step (1) is extracted by Soxhlet extraction, and after the extraction is completed, filter to obtain the ionic liquid / solvent mixture and catalyst carrier; distill off the solvent in the ionic liquid / solvent mixture to obtain the ionic liquid mother liquor containing the noble metal complex; (3) after diluting the ionic liquid mother liquor containing the noble metal complex with water, hydrate with water Hydrazine reduction, solid-liquid separation after full reaction, the obtained solid is first washed with deionized water, and then washed with nitric acid to remove base metal impurities, that is, the precious metal is obtained; the obtained liquid is dried to obtain a regenerated ionic liquid.

Description

technical field [0001] The invention relates to a method for recovering precious metals in spent carbon-supported precious metal catalysts. Background technique [0002] Precious metals mainly refer to eight metal elements including gold, silver and platinum group metals (ruthenium, rhodium, palladium, osmium, iridium, platinum). Precious metals are widely used in modern industry due to their high melting point, high boiling point, low vapor pressure, anti-oxidation and corrosion resistance. With the development of industries such as petroleum, chemical industry, and environmental protection, the amount of precious metal catalysts is increasing year by year. During use, the catalyst loses its activity due to problems such as poisoning, easy structure of the carrier, and carbon accumulation, and it needs to be replaced regularly. According to statistics, about 500,000 to 700,000 tons of spent catalysts are generated in the world every year, and the The content of precious m...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00C01B32/354B01J23/42B01J23/44B01J23/46B01J23/50B01J23/52
CPCB01J23/42B01J23/44B01J23/462B01J23/464B01J23/50B01J23/52C22B7/006C22B11/048C01B32/354Y02P10/20
Inventor 丰枫孙嫣霞芮佳瑶李小年赵佳刘佳媚郭伶伶张群峰许孝良卢春山
Owner ZHEJIANG UNIV OF TECH
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