Double-active-site platinum-based catalyst and preparation method and application thereof
A dual-activity, catalyst technology, applied in the field of catalysis, can solve the problem of low selectivity, achieve mild reaction conditions, increase the production rate, and make the preparation process green.
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[0023] Concretely, as an aspect of the technical solution of the present invention, the preparation method of a kind of dual active site Pt-based catalyst it relates to comprises:
[0024] Calcining the metal oxide, and then mixing and reacting the obtained calcined product with a buffer solution and dopamine hydrochloride to obtain a first solid;
[0025] And, the first solid matter is placed in a solution containing a platinum salt for impregnation treatment to prepare a Pt-based catalyst with dual active sites.
[0026] In some preferred embodiments, the preparation method specifically includes:
[0027] Calcining the metal oxide at 300°C-500°C for 2-4 hours in an air atmosphere, and then dispersing the obtained calcined product in a buffer solution to form a first suspension;
[0028] And, mixing dopamine hydrochloride with the first suspension, and stirring and reacting at room temperature for 12-24 hours, and then centrifuging, washing, and drying to obtain the first so...
Embodiment 1
[0066] Take a certain amount of CoO in a muffle furnace, heat up to 400°C at 5°C / min and calcinate for 2 hours to obtain Co 3 o 4 .
[0067] Weigh 0.5gCo 3 o 4 Into a 25ml beaker, add 10ml of Tris-HCl solution with pH=8.5, stir and disperse for 5min to obtain the first suspension;
[0068] Add 20 mg of dopamine hydrochloride to the above first suspension, and stir at room temperature for 24 h, wherein dopamine hydrochloride and Co 3 o 4 The mass ratio is 4:100;
[0069] The mixture obtained above was washed by centrifugation, four times with deionized water, and once with ethanol, and dried in a vacuum oven at 65°C for 12 hours to obtain dopamine hydrochloride-modified Co 3 o 4 , denoted as Co 3 o 4 @4wt%PDA.
[0070] Take 0.25gCo 3 o 4 @4wt% PDA In a 25ml round bottom flask, add 6m11.85g / L ethanol solution of chloroplatinic acid, magnetically stir for 30min, stand at room temperature for immersion for 24h, stir and evaporate the solvent in an oil bath at 80°C to o...
Embodiment 2
[0074] Method is with embodiment 1, and difference is: dopamine hydrochloride and Co 3 o 4 The mass ratio is 6:100, and the prepared dual-active-site Pt-based catalyst is denoted as Pt / Co 3 o 4 @6wt% PDA catalyst, the Pt content is 1.13wt%, and the amount of surface N is 1.85mol%.
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