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Sub-nano metal catalyst as well as preparation method and application thereof

A metal catalyst and sub-nanometer technology, applied in the field of sub-nanometer catalysis, can solve the problems of precise control of the content and size of metal active components, harsh preparation conditions, etc.

Inactive Publication Date: 2020-10-20
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods for preparing sub-nanometer metal catalysts in the prior art mainly include mass separation / soft landing methods and ligand protection methods. There are problems with harsh preparation conditions, active sites covered by ligands, and difficulty in precisely controlling the metal active components at the sub-nanometer level. content and size

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  • Sub-nano metal catalyst as well as preparation method and application thereof
  • Sub-nano metal catalyst as well as preparation method and application thereof
  • Sub-nano metal catalyst as well as preparation method and application thereof

Examples

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preparation example Construction

[0028] The invention provides a kind of preparation method of subnanometer metal catalyst, comprises the following steps:

[0029] mixing the carrier material and the diluent, coating the resulting mixture on the surface of the substrate, and forming a carrier material layer on the surface of the substrate after drying;

[0030] The surface of the carrier material layer is etched based on the pulse oxidation pretreatment to obtain a defect material rich in epoxy groups, and a defect material layer rich in epoxy groups is formed on the surface of the substrate; the oxidizing agent used in the pulse oxidation pretreatment for ozone;

[0031] Based on the atomic layer deposition method, by sequentially pulsing gaseous metal precursors and gaseous oxidants, metal deposition is performed on the surface of the epoxy-rich defect material layer to obtain subnano metals in the form of atomic dispersion. The sub-nanometer metal catalyst is obtained on the surface of the substrate.

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Embodiment 1

[0061] (1) Prepare graphene carrier material by rapid thermal expansion method (reference: Structural evolutionduring annealing of thermally reduced graphene nanosheets for application insupercapacitors.Carbon 2012,50,3572-3584), denoted as G1600, the epoxy group in the G1600 The content is 0.19at.%; the G1600 is mixed with ethanol, dispersed uniformly to obtain a suspension, the concentration of G1600 in the suspension is 0.01g / mL, and the suspension is coated on a quartz plate (the size is 8cm× 8cm) surface, after natural drying at room temperature (25°C), a G1600 layer (thickness ≤ 0.15cm) is formed on the surface of the quartz plate;

[0062] (2) Place the quartz plate containing the G1600 layer in the atomic layer deposition chamber (the volume of the atomic layer deposition chamber is about 500cm 3 ), the carrier gas is high-purity N 2 (99.999%), utilize atomic layer deposition technology to carry out ozone (O 3 ) etching, the set etching parameters are: chamber temper...

Embodiment 2

[0071] The subnano Pt / graphene catalyst was prepared with reference to the method of Example 1, the only difference from Example 1 was that G1600-O 3 The number of times of deposition treatment of Pt metal on the -60 surface is 1 time, and the subnano Pt / graphene catalyst (referred to as 1Pt / G1600-O 3 -60, the platinum content is 1.06wt.%, where "1" represents the number of depositions).

[0072] According to performance test method in embodiment 1, utilize 1Pt / G1600-O 3 -60 catalyzes the hydrolysis of ammonia borane to produce hydrogen. The test results show that 110 mL of H was produced in 21 minutes. 2 ; After six cycle stability tests according to the method in Example 1, about 80% of the initial reactivity was retained.

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Abstract

The invention provides a sub-nano metal catalyst as well as a preparation method and an application thereof, and belongs to the technical field of sub-nano catalysis. An epoxy group can be uniquely formed on the surface of a carrier material layer through pulsed ozone, and a stable and single growth site is provided for preparation of the sub-nano metal catalyst; and then, the sub-nano metal is loaded on the carrier by adopting an atomic layer deposition method, so that the sub-nano metal catalyst which is highly dispersed and has good uniformity can be prepared. Meanwhile, the sub-nano metalcatalyst is prepared by adopting an atomic layer deposition method, calcining treatment is not needed, and the content of epoxy groups and the content and size of sub-nano metal can be accurately regulated and controlled by regulating and controlling operation parameters; the sub-nano metal catalyst prepared by the method provided by the invention has excellent activity and stability.

Description

technical field [0001] The invention relates to the technical field of subnano catalysis, in particular to a subnano metal catalyst and its preparation method and application. Background technique [0002] Current studies have shown that for supported metal catalysts, the reduction in the size of the active component will greatly affect the performance of the catalyst, because the active sites generally exist on the surface of the catalyst, and the metal components inside the catalyst that are not in contact with the reactants are not It does not participate in the reaction, so controlling the distribution and structure of the surface atoms of the catalyst by controlling the size, morphology and crystal plane of the active component is an effective means to improve the catalytic performance. When the size of metal nanoparticles decreases, it will not only significantly increase the proportion of metal atoms exposed on the surface of the catalyst, greatly improve the utilizat...

Claims

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Application Information

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IPC IPC(8): B01J23/42C01B3/04
CPCB01J23/42C01B3/04B01J35/394Y02E60/36
Inventor 覃勇杨杰陈朝秋赵世超张佰艳赵吉晓
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI