A kind of precious metal leaching agent and the method for recovering precious metal in waste catalyst
A technology for waste catalysts and precious metals, which is applied in the field of precious metals recovery in waste catalysts, can solve the problems of strong corrosiveness of chlorides, difficult application, and the need for oxidation conditions, and achieves the effects of low volatility, less waste of resources, and avoidance of incineration processes.
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Embodiment 1
[0049] The Au@AC catalyst with a loading capacity (relative to the mass of the support) of 3wt% was prepared by the method of the literature [Functional Materials, 2012, 43:222-225]. The support 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.
[0050] After mixing 3g of ionic liquid 1-butyl-3-methylimidazole bis-nitrile amine salt with 0.5g of iodoform and 5mL of acetone, add 1g of the above-mentioned spent Au@AC catalyst, and ultrasonicate at 80°C and 260W power under the condition of visible light irradiation After 2 hours, the solid and liquid were separated, the liquid phase was the ionic liquid containing the gold complex, and the solid phase was the catalyst. The catalyst was subjected to Soxhlet extraction, the solvent was 150 mL of acetone, the extraction temperature...
Embodiment 2
[0052] Au@SiO with a loading amount (relative to the mass of the carrier) of 1wt% was prepared by the method of the literature [Petroleum Refining and Chemical Industry, 2009, 40(2): 31-35]. 2 Catalyst, whose support is columnar SiO 2 , the particle size is 50 mesh, and the specific surface area is 300m 2 / g, the pore volume is 0.7mL / g, and the catalyst is used to catalyze the reaction of cyclohexane oxidation to become a spent catalyst.
[0053] After mixing 3g of ionic liquid 1-butyl-3-methylimidazolium dinitrile amine salt with 0.5g of iodoform and 5mL of acetonitrile, add 2g of the above Au@SiO 2 The spent catalyst was subjected to ultrasonication at 100°C and visible light for 2 hours with a power of 195W, and then the solid and liquid were separated. The liquid phase was the ionic liquid containing palladium complex, and the solid phase was the catalyst. The catalyst was subjected to Soxhlet extraction, the solvent was 150 mL of acetonitrile, the extraction temperature...
Embodiment 3
[0055] The Au@ZSM-5 catalyst with a loading capacity (relative to the carrier mass) of 5wt% was prepared by the method of the literature [Acta Catalytica Sinica, 2007, 28(5): 240-245]. The carrier is a columnar ZSM-5 molecular sieve with a particle size of 50 mesh, specific surface area 300m 2 / g, the pore volume is 0.6mL / g, and the catalyst is used to catalyze the oxidation of β-ionone to become a spent catalyst.
[0056] After mixing 5g of ionic liquid 1-ethyl-3-methylimidazolium bis-nitrile amine salt with 1g of iodoform and 5mL of ethanol, add 1g of the above-mentioned Au@ZSM-5 spent catalyst, and under the condition of 90°C and visible light irradiation with 260W power After ultrasonication for 1 h, the solid and liquid were separated, the liquid phase was the ionic liquid containing the palladium complex, and the solid phase was the catalyst. The catalyst was subjected to Soxhlet extraction, the solvent was 200 mL ethanol, the extraction temperature was 50° C., and the ...
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