Monatomic noble metal catalyst, preparation method thereof and application thereof in room-temperature catalytic oxidation of formaldehyde
A precious metal catalyst, precious metal technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of poor room temperature degradation effect, low utilization rate of precious metal atoms, etc., to improve dispersion, inhibit metal Nucleation, enhanced interaction effects
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[0035] A preparation method of a single-atom noble metal catalyst, comprising the steps of:
[0036] (1) After the activated carbon is modified, it is immersed in a noble metal salt solution to obtain an impregnating solution;
[0037] (2) Mix the reducing agent solution with the impregnating solution in step (1) under ultra-low temperature environment, and react;
[0038] (3) Filtrating, washing and drying the reactant in step (2) to prepare a supported single-atom noble metal catalyst.
[0039] Preferably, said step (1) specifically includes the following steps:
[0040] (1a) After the activated carbon is treated with a nitrogen-containing compound modification solution, it is immersed in a noble metal salt solution to obtain an impregnation solution.
[0041] Preferably, in step (1a), the activated carbon is soaked in the modification solution at 20-120° C. for 3-10 hours.
[0042] Preferably, in step (1a), the mass fraction of the modified solution is 1%-30%.
[0043] ...
Embodiment 1
[0068] The activated carbon was baked in a drying oven at 105°C for 12 hours for later use. Weigh 10 g of activated carbon, add 20 mL of glutamic acid solution with a mass fraction of 2%, shake at room temperature for 1 h, then let stand for 3 h, filter off the impregnating solution, and dry at 105 ° C to obtain modified activated carbon.
[0069] Configure 20mL 0.003mol / L H 2 PtCl 6 ﹒ 6H 2 O solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 10g of modified activated carbon is added to H at room temperature 2 PtCl 6 ﹒ 6H 2 O solution, stirring and impregnating for 8h, the stirring rate is 500rmp; prepare 60mL 0.01mol / L hydrazine hydrate solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 2 PtCl 6 ﹒ 6H 2 The O solution and the hydrazine hydrate solution were placed in the low-temperature reaction box, and when the temperature dropped to -60°C, the hydrazine hydrate solution was slowly added to the H 2 PtCl ...
Embodiment 2
[0071] The activated carbon was baked in a drying oven at 105°C for 12 hours for later use. Weigh 10 g of activated carbon, add 20 mL of glycine solution with a mass fraction of 5%, shake at room temperature for 1 h, then let it stand for 8 h, filter off the impregnating solution, and dry at 105 ° C to obtain modified activated carbon.
[0072] Configure 20mL0.003mol / L H 2 PtCl 6 ﹒ 6H 2 O solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 10g of modified activated carbon is added to H at room temperature 2 PtCl 6 ﹒ 6H 2 In the O solution, stirring and impregnating for 8 hours, the stirring rate is 500rmp; prepare 60mL0.01mol / L hydrazine hydrate solution, the solvent is composed of water and ethanol in a volume ratio of 1:9; 2 PtCl 6 ﹒ 6H 2 The O solution and the hydrazine hydrate solution were placed in the low-temperature reaction box, and when the temperature dropped to -60°C, the hydrazine hydrate solution was slowly added to the H 2...
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