A kind of high-dispersion ultra-small size carbon-supported noble metal catalyst and preparation method thereof

A noble metal catalyst, small size technology, applied in the preparation of high dispersion ultra-small size carbon-supported noble metal catalyst, the field of high-dispersion ultra-small size carbon-supported noble metal catalyst, can solve the limitation of the widespread application of fuel cells, the large diameter of platinum particles , limited reserves, etc.

Inactive Publication Date: 2020-10-27
XI AN JIAOTONG UNIV +1
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Problems solved by technology

However, the reserves of noble metals (platinum, palladium, gold, iridium, rhodium, etc.) are limited and expensive, making the cost of noble metal catalysts high, especially limiting the wide application of fuel cells
At present, platinum-carbon catalysts produced in large quantities are usually prepared by impregnation reduction method, the disadvantage is that the diameter of platinum particles is relatively large

Method used

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  • A kind of high-dispersion ultra-small size carbon-supported noble metal catalyst and preparation method thereof
  • A kind of high-dispersion ultra-small size carbon-supported noble metal catalyst and preparation method thereof
  • A kind of high-dispersion ultra-small size carbon-supported noble metal catalyst and preparation method thereof

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preparation example Construction

[0033] refer to figure 1 , shows a step flow chart of a method for preparing a high-dispersion ultra-small size carbon-supported noble metal catalyst of the present invention, and the method may specifically include the following steps:

[0034] Step S1: Mix the carbon material with the dispersion of borolene hydride, wherein, in the mixed solution, the mass ratio of the carbon material to the borohydride is 1:0.01-1; Activated carbon is fully and evenly dispersed to obtain a uniform dispersion of carbon material-supported boron hydride;

[0035] In the present invention, the above-mentioned carbon material may be one or more of carbon black, activated carbon, graphene, graphene oxide, graphyne, carbon nanotubes, carbon nanofibers, carbon nanospheres, natural graphite and porous carbon.

[0036] The solvent used in the dispersion of borohydride can be one or more of methanol, ethanol, acetone, tetrahydrofuran, and N,N-dimethylformamide. Among them, the mass concentration of ...

Embodiment 1

[0047] Experiments were performed on the precious metal "platinum".

[0048] First, weigh 25 mg of activated carbon, and mix the activated carbon with 1.25 mL of borohydride methanol dispersion, wherein the mass concentration of borohydride methanol dispersion is 20 mg / mL, and the mass ratio of activated carbon to borohydride is 1:1; Then, magnetic stirring and ultrasonic dispersion are used to fully and uniformly disperse the activated carbon to obtain a uniform dispersion of activated carbon-supported boron hydride. Next, according to the mass ratio of activated carbon and precious metal mass ratio of 1:0.5, add 315 μl potassium chloroplatinate aqueous solution to the above dispersion liquid, wherein the concentration of potassium chloroplatinate aqueous solution is 200mM (1mM=1mmol / L, in the following examples , all expressed in mM as the concentration unit of the noble metal aqueous solution), fully stirred at room temperature to obtain a suspension of activated carbon sup...

Embodiment 2

[0051] Experiments were performed on the precious metal "gold".

[0052] First, take 25mg of activated carbon, mix the activated carbon with 20ml of borolene ethanol dispersion, the mass concentration of borolene ethanol dispersion is 0.25mg / ml, wherein the mass ratio of activated carbon to borolene is 1:0.2; then , using magnetic stirring and ultrasonic dispersion to fully and uniformly disperse the activated carbon to obtain a uniform dispersion of activated carbon-supported boron hydride. Then, according to the mass ratio of activated carbon to precious metal mass ratio of 1:0.125, add 320 μl of chloroauric acid aqueous solution to the above dispersion liquid, wherein the concentration of chloroauric acid aqueous solution is 100mM, and fully stir at room temperature to obtain activated carbon-loaded ultra-small size gold nanoparticles Suspension of particulate catalyst. The above-mentioned suspension is filtered to obtain a solid precipitate, which is fully washed with wat...

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Abstract

The present invention provides a high-dispersion ultra-small carbon-supported noble metal catalyst and a preparation method thereof. The preparation method includes: step S1: mixing the carbon material with a dispersion of borane hydride, wherein, in the mixed solution, the The mass ratio of the carbon material to the borolene is 1:0.01-1; then the activated carbon in the mixed solution is fully and evenly dispersed to obtain a uniform dispersion of the carbon material supported borolene; step S2: according to the The mass ratio of the carbon material to the noble metal is 1:0.001-0.5, and the aqueous solution of the noble metal precursor is added to the homogeneous dispersion of the carbon material-supported boron hydride, and the aqueous solution is fully stirred to obtain a suspension; step S3: the suspension The turbid liquid is filtered and processed to obtain the high-dispersion ultra-small carbon-supported noble metal catalyst. The preparation cost of the invention is low, the environment is friendly, the surface of the prepared noble metal catalyst particles is clean, the catalytic activity is high, the preparation method is simple, the equipment requirement is low, and industrial production is easy to realize.

Description

technical field [0001] The invention relates to the technical field of preparation of noble metal catalysts, in particular to a preparation method of a high-dispersion ultra-small-sized carbon-supported noble metal catalyst, and a high-dispersion ultra-small-sized carbon-supported noble metal catalyst. Background technique [0002] Noble metal catalysts have been widely used as electrocatalytic hydrogen evolution reaction catalysts, electrode catalysts for fuel cells, and catalysts for hydrodehydrogenation reactions. At the same time, noble metal catalysts are currently the most mature, most commonly used and best-performing catalysts. However, the reserves of precious metals (platinum, palladium, gold, iridium, rhodium, etc.) are limited and expensive, making the cost of noble metal catalysts high, especially limiting the wide application of fuel cells. At present, mass-produced platinum-carbon catalysts are usually prepared by the impregnation reduction method, but the di...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/52B01J23/46B01J35/02
CPCB01J23/42B01J23/44B01J23/52B01J23/462B01J23/468B01J23/464B01J35/023B01J35/0066B01J37/0207B01J35/002B01J35/0033B01J35/0013B01J21/185B01J37/0045B01J37/04B01J37/06
Inventor 杨生春高赛赛王斌
Owner XI AN JIAOTONG UNIV
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