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A kind of platinum catalyst with double-layer core-shell structure and its preparation method and application

A core-shell structure, platinum catalyst technology, applied in the field of photocatalysis, can solve the problem of unsatisfactory hydrogen generation rate and other problems

Active Publication Date: 2021-03-26
INNER MONGOLIA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The composite materials mentioned above are compared with pure TiO 2 In terms of photocatalysis, the photocatalytic performance has been improved, but if it is used in water catalytic decomposition reaction, the rate of water catalytic decomposition to generate hydrogen is still not ideal.

Method used

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  • A kind of platinum catalyst with double-layer core-shell structure and its preparation method and application
  • A kind of platinum catalyst with double-layer core-shell structure and its preparation method and application
  • A kind of platinum catalyst with double-layer core-shell structure and its preparation method and application

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preparation example Construction

[0035] The platinum catalyst with a double-layer core-shell structure provided by the present invention includes a core body, the core body is a silica microsphere, and the diameter of the silica microsphere is preferably 100-150 nm, more preferably 110-140 nm, more preferably It is 120~130nm; The specific surface area of ​​described silica microsphere is preferably 27~30m 2 g -1 , more preferably 28-29m 2 g -1 ; The pore size of the silica microspheres is preferably 23-26 nm, more preferably 24-25 nm. In the present invention, the silica microspheres are preferably Prepared by a method, the preparation method preferably includes the following steps:

[0036] Mix ethanol, water and ammonia water to obtain a mixed solvent;

[0037] A liquid-phase organosilicon source is added dropwise to the mixed solvent, and after the hydrolysis reaction, the reacted materials are sequentially subjected to solid-liquid separation, washing and drying to obtain silicon dioxide microsphere...

Embodiment 1

[0106] using the classic Method to prepare nano-SiO 2 Microspheres. Add 368mL of absolute ethanol (EtOH), 68.8mL of deionized water and 10.0mL of ammonia water with a mass concentration of 25% in a 500mL clean beaker, and stir at room temperature for 30min to obtain a nucleosome dispersion with a pH value of 9;

[0107] Add 14.0mL tetraethyl orthosilicate (TEOS) dropwise to the obtained nuclei dispersion, put the beaker in an oil bath at 25°C and stir with a magnet to hydrolyze the tetraethyl orthosilicate at a rate of 260r / min, the stirring time is 4h. After the hydrolysis reaction, the product was centrifuged at 8500 r / min for 5 minutes. Then the sample was washed three times with deionized water, and then washed three times with absolute ethanol, dried in a vacuum oven at 60°C and 0.075MPa, and ground the dried sample to obtain silica microspheres, which were white as a whole , spread out with a purple sheen.

[0108] Add 1g of graphite powder, 120mL of concentrated ...

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Abstract

The invention belongs to the technical field of photocatalysis, and particularly relates to a double-layer core-shell platinum catalyst and a preparation method and application thereof. The double-layer core-shell platinum catalyst provided by the invention comprises a core body and a shell layer, wherein the core body is formed by silicon dioxide microspheres; the shell layer sequentially comprises a titanium dioxide layer and a graphene oxide layer from inside to outside; the titanium dioxide layer comprises a component of anatase titanium dioxide; and the graphene oxide layer is loaded withPt. When the double-layer core-shell platinum catalyst provided by the invention is applied to catalytic water decomposition, the hydrogen production amount reaches 39.26mmol / g after reaction for 6h.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a platinum catalyst with double-layer core-shell structure and its preparation method and application. Background technique [0002] TiO 2 It has many advantages such as strong photocatalytic performance, large specific surface area, and long-term stability, and has always attracted the attention of researchers, but TiO 2 The forbidden band width of TiO is only 3.2 electron volts, and it can only absorb ultraviolet light equivalent to 3-5% of sunlight to participate in the reaction, thus affecting the TiO 2 photocatalytic performance. To improve TiO 2 Catalytic activity, the researchers put TiO 2 Composite with noble metals, such as Au, Ag and Pt, etc., using noble metals and TiO 2 The difference in the Fermi energy level promotes the migration of carriers in the composite material, increases the rate of redox reaction, and then achieves the improvement of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/42C01B3/04
CPCB01J23/42B01J35/004B01J35/008C01B3/042Y02E60/36
Inventor 张雁冰刘宝仓李常艳
Owner INNER MONGOLIA UNIVERSITY
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