A kind of supported highly dispersed nano-gold catalyst and its preparation method and application
A high-dispersion, nano-gold technology, applied in the direction of catalyst activation/preparation, carbon-based compound preparation, chemical instruments and methods, etc., can solve problems such as many steps, difficult control of particle size and dispersion, complicated separation and purification processes, etc.
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[0037] The invention provides a preparation method of a loaded highly dispersed Au / ZnO nano-gold catalyst, comprising the following steps:
[0038] 2-Methylimidazole is mixed with chloroauric acid solution to obtain a mixed solution;
[0039] Adding the zinc salt solution dropwise to the mixed solution for precipitation to obtain a precursor;
[0040] The precursor is calcined to obtain a supported highly dispersed Au / ZnO nano-gold catalyst.
[0041] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.
[0042] In the invention, 2-methylimidazole is mixed with chloroauric acid solution to obtain a mixed solution. In the present invention, the mass ratio of the 2-methylimidazole to the chloroauric acid solution in the chloroauric acid solution is preferably (100-5000):1, more preferably 1000:1.
[0043] In the present invention, the preparation process of the chlor...
Embodiment 1
[0069] Add 1 mL of chloroauric acid aqueous solution (5 mg / mL) to 100 mL of methanol to obtain a chloroauric acid solution (concentration is 50 μg / mL);
[0070] Weigh 5g of 2-methylimidazole, and dissolve 2-methylimidazole in the chloroauric acid solution under stirring conditions (rotating speed 600rpm), and continue stirring for 10min after it is completely dissolved to obtain a mixed solution;
[0071]Weigh 1.84g of zinc nitrate hexahydrate solid and dissolve it in 100mL of methanol, put the obtained zinc nitrate solution into a decompression funnel, add it dropwise to the mixed solution, let stand for 24h, and precipitate, and centrifuge the obtained material, The obtained solid material was dried in an oven at 80°C, and after grinding, the precursor was obtained;
[0072] The precursor was placed in a muffle furnace and calcined at 500° C. for 4 h, and the heating rate was 2° C. / min to obtain a supported highly dispersed Au / ZnO nano-gold catalyst.
Embodiment 2
[0074] Add 1 mL of chloroauric acid aqueous solution (5 mg / mL) to 100 mL of methanol to obtain a chloroauric acid solution (concentration is 50 μg / mL);
[0075] Weigh 5g of 2-methylimidazole, and dissolve 2-methylimidazole in the chloroauric acid solution under stirring conditions (rotating speed 600rpm), and continue stirring for 10min after it is completely dissolved to obtain a mixed solution;
[0076] Weigh 1.14g of zinc acetate solid and dissolve it in 100mL of methanol, put the resulting zinc nitrate solution into a decompression funnel, add it dropwise to the mixed solution, let stand for 24h, and precipitate, centrifuge the resulting material, and The solid material is dried in an oven at 80°C, and after grinding, the precursor is obtained;
[0077] The precursor was placed in a muffle furnace and calcined at 500° C. for 4 h, and the heating rate was 2° C. / min to obtain a supported highly dispersed Au / ZnO nano-gold catalyst.
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Abstract
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