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

Active Publication Date: 2016-09-28
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In most practical catalytic reactions, the operating temperature may be too high. However, under high temperature conditions, small-sized platinum nanocrystals (<10 nm) are prone to agglomeration and deactivation, which greatly limits its applicat

Method used

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  • Precious metal platinum nanometer catalyst and preparation method and application thereof
  • Precious metal platinum nanometer catalyst and preparation method and application thereof
  • Precious metal platinum nanometer catalyst and preparation method and application thereof

Examples

Experimental program
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Example Embodiment

[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...

Example Embodiment

[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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Abstract

The invention discloses a precious metal platinum nanometer catalyst and a preparation method and application thereof. Precious metal platinum nanometer particles are loaded on oxide of transition metal iron, and meanwhile graphene oxide is used as the whole substrate of the precious metal platinum nanometer particles and the oxide of transition metal iron to achieve even scattering. The catalyst has the advantages of being easy to prepare, wide in using range and the like. After the catalyst is directly roasted for 2 h at 350-850 DEG C in air or nitrogen, the particle size of the catalyst Pt particles is still kept being 3-5 nm; the problem that the Pt catalyst is likely to be sintered and lose activity in the reaction at the high temperature of 750 DEG C or above is solved, and the high-temperature catalysis application such as automobile tail gas treatment and other high-temperature reactors is broadened.

Description

technical field [0001] The invention belongs to the technical field of nano-catalysts, and in particular relates to a noble metal platinum nano-catalyst with high-temperature anti-sintering performance and a preparation method and application thereof. Background technique [0002] Platinum nanocrystals are widely concerned nanocatalysts. Because of their large specific surface area, high surface energy, short diffusion channels in the crystal, many catalytic active sites on the surface, and strong adsorption capacity, the reaction rate can be controlled. Size and facet structure have a crucial influence on catalytic activity. In most practical catalytic reactions, the operating temperature may be too high. However, under high temperature conditions, small-sized platinum nanocrystals (<10 nm) are prone to agglomeration and deactivation, which greatly limits its application. Improving the anti-sintering performance of supported noble metal nanocatalysts at high temperature...

Claims

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Application Information

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IPC IPC(8): B01J23/89
CPCB01J23/8906B01J35/0013
Inventor 代云茜齐晓冕吴迪符婉琳孙岳明
Owner SOUTHEAST UNIV
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