Precious metal platinum nanometer catalyst and preparation method and application thereof
A technology of catalysts and precious metals, applied in the field of noble metal platinum nano-catalysts with high-temperature anti-sintering performance and its preparation, can solve the problems of easy agglomeration and deactivation of platinum nanocrystals, limited applications, etc., and achieve the effect of wide application range and simple preparation method
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[0036] Example 1:
[0037] Preparation of 3-5nm Pt particles
[0038] a. First, preheat 4 mL of ethylene glycol at 110°C for 30 minutes.
[0039] b. Dissolve PVP (Mw≈55000) in 2 mL of ethylene glycol at a concentration of 11.3 mg / mL.
[0040] c. Dissolve chloroplatinic acid in 2 mL of ethylene glycol to a concentration of 8.3 mg / mL.
[0041] d. Inject 0.5 mL of each of the two solutions in steps b and c into the ethylene glycol in step a at the same time, with an injection speed of 0.67 mL / min. The reaction was continued at 110°C for 0.5-1h, and cooled naturally to room temperature. The resulting Pt suspension was clear and gray, and the product was not centrifuged for cleaning.
[0042] Carrier α-Fe 2 O 3 Synthesis
[0043] a. Disperse PVP in 3mL of ethanol solvent with a concentration of 0.13g / mL; add 3.5mL of glacial acetic acid; then add iron acetylacetonate (Fe(acac) 3 ) To prepare a spinning precursor solution with a concentration of 0.12 g / mL.
[0044] b. Transfer the spinning pre...
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[0052] Example 2:
[0053] a. The α-Fe in Example 1 2 O 3 The particles were dispersed in ethanol to obtain a suspension with a concentration of 1 mg / mL.
[0054] b. Pt suspension and Fe prepared in accordance with Example 1 2 O 3 The volume ratio of the suspension is 1:10. Take out the Pt suspension and disperse it in a mixed solution with a volume ratio of ethanol and water of 4:1.
[0055] c. Mix the suspension of step a with the mixed solution obtained in step b, and stir for 2h at room temperature. Pt is supported on Fe 2 O 3 On the surface of the particles, the catalytic precursor Pt / Fe is obtained 2 O 3 .
[0056] d. The catalytic precursor Pt / Fe in step c 2 O 3 Disperse in the ethanol solution of PVP (Mw≈55000) with a concentration of 6mg / mL, and use a vortex mixer to help dissolve to obtain a suspension with a concentration of 0.5mg / mL. The catalyst precursor Pt / Fe 2 O 3 Mixed with graphene oxide (GO) in a volume ratio of 1:1, the catalytic precursor Pt / Fe 2 O 3 Evenly dispers...
Example Embodiment
[0057] Example 3:
[0058] a. The α-Fe in Example 1 2 O 3 The particles were dispersed in ethanol to obtain a suspension with a concentration of 1 mg / mL.
[0059] b. Pt suspension and Fe prepared in accordance with Example 1 2 O 3 The volume ratio of the suspension is 1:10. Take out the Pt suspension and disperse it in a mixed solution with a volume ratio of ethanol and water of 4:1.
[0060] c. Mix the suspension of step a with the mixed solution obtained in step b, and stir for 2h at room temperature. Pt is supported on Fe 2 O 3 On the surface of the particles, the catalytic precursor Pt / Fe is obtained 2 O 3 .
[0061] d. The catalytic precursor Pt / Fe in step c 2 O 3 Disperse in the ethanol solution of PVP (Mw≈55000) with a concentration of 6mg / mL, and use a vortex mixer to help dissolve to obtain a suspension with a concentration of 0.5mg / mL. The catalyst precursor Pt / Fe 2 O 3 Mixed with graphene oxide (GO) in a volume ratio of 1:1, the catalytic precursor Pt / Fe 2 O 3 Evenly dispers...
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