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Method for obtaining atomic-scale dispersed noble metal catalyst by one-step reduction loading

A noble metal catalyst and atomic-level technology, applied in the fields of materials science and engineering technology and chemistry, to achieve the effects of high application range, efficient regulation, and simple process

Inactive Publication Date: 2019-11-05
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, with the deepening of research work, researchers have found that the existing synthesis methods cannot fully meet the demand for precise synthesis of catalysts at the atomic scale, and there is a big gap between the large-scale preparation of single-atom catalysts. Therefore, it is urgent to A new strategy for the general preparation of single-atom catalysts is needed

Method used

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  • Method for obtaining atomic-scale dispersed noble metal catalyst by one-step reduction loading
  • Method for obtaining atomic-scale dispersed noble metal catalyst by one-step reduction loading

Examples

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Effect test

Embodiment 1

[0024] Preparation of atomically dispersed metal Pt catalysts.

[0025] First, configure reaction solution A: 0.01M H 2 PtCl 6 Solution, the solvent is a water / ethanol mixed solution with a volume ratio of 1:9; reducing agent solution B: ethanol solution; carrier dispersion C: 2.5 mg ml -1 Nitrogen-doped mesoporous carbon dispersions. Next, the above-mentioned solution and dispersion liquid were placed in a low-temperature box, the temperature was lowered to minus 60° C., and the temperature was maintained for 30 minutes. Mix the reducing agent solution B and the carrier dispersion C evenly, add 5ml H 2 PtCl 6 Solution A was added to the well mixed solution. The mixed liquid was stirred continuously for 5-7h at minus 60°C to complete the reduction and loading process. The nitrogen-doped mesoporous carbon-supported Pt single-atom samples were recovered and cleaned by low-temperature vacuum filtration, and then dried naturally at room temperature. An atomically dispersed ...

Embodiment 2

[0027] Preparation of atomically dispersed metal Pt catalysts.

[0028] First, configure reaction solution A: 0.02M H 2 PtCl 6 solution, the solvent is a water / ethanol mixed solution with a volume ratio of 1:9; reducing agent solution B: 5.0M N containing 0.10M KOH 2 h 5 OH hydrazine hydrate solution; carrier dispersion C: 2.5 mg ml -1 Nitrogen-doped mesoporous carbon dispersions. Next, the above-mentioned solution and dispersion liquid were placed in a low-temperature box, the temperature was lowered to minus 40° C., and the temperature was maintained for 30 minutes. Mix the reducing agent solution B and the carrier dispersion C evenly, add 5ml H 2 PtCl 6 Solution A was added to the well mixed solution. The mixed liquid was stirred continuously for 5-7h at minus 40°C to complete the reduction and loading process. The nitrogen-doped mesoporous carbon-supported Pt single-atom samples were recovered and cleaned by low-temperature vacuum filtration, and then dried natural...

Embodiment 3

[0030] Preparation of atomically dispersed metal Pt catalysts.

[0031] First, configure reaction solution A: 0.01M H 2 PtCl 6 solution, the solvent is a water / ethanol mixed solution with a volume ratio of 1:9; reducing agent solution B: 5.0M NaBH containing 0.5M KOH 4 Solution; Carrier Dispersion C: 2.5 mg ml -1 Nitrogen-doped mesoporous carbon dispersions. Next, the above-mentioned solution and dispersion liquid were placed in a low-temperature box, the temperature was lowered to minus 60° C., and the temperature was maintained for 30 minutes. Mix the reducing agent solution B and the carrier dispersion C evenly, add 5ml H 2 PtCl 6 Solution A was added to the well mixed solution. The mixed liquid was stirred continuously for 5-7h at minus 60°C to complete the reduction and loading process. The nitrogen-doped mesoporous carbon-supported Pt single-atom samples were recovered and cleaned by low-temperature vacuum filtration, and then dried naturally at room temperature. ...

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Abstract

The invention relates to a method for obtaining an atomic-scale dispersed noble metal catalyst by one-step reduction loading, and belongs to the field of material science and engineering technology and chemistry. The nano-scale dispersed atomic-scale metal supported catalyst prepared through the method is an atomic-scale dispersed metal catalyst prepared through the method and is an atomic-scale dispersed metal Pt atom loaded on nitrogen-doped mesoporous carbon (CMK-3), mesoporous carbon, nitrogen-doped graphene, graphite-phase carbon carbide (g-C3N4) and other carriers. Firstly, a reactant solution A with a certain concentration, a reactant solution B with a certain concentration and a carrier dispersion solution C with a certain concentration are prepared; in a low-temperature environment, the reactant solution B is evenly mixed with the carrier dispersion solution C, then the reactant solution A is added into a mixed solution of the reactant solution B and the carrier dispersion solution C at one time, the materials are stirred to fully react and load, and finally various materials of the atomic-scale noble metal catalyst uniformly dispersed on the carrier are obtained. The method has the advantages that the density is high, the quantity is large, the efficiency is high, sample preparation is simple and safe, and the application range is wide.

Description

[0001] (1) Invention title: a method for one-step reduction of loading to obtain atomically dispersed noble metal catalysts [0002] (2) Technical field [0003] The invention relates to a method for preparing high-capacity atomically dispersed noble metal-supported and supported composite catalysts in a low-temperature solution environment, and belongs to the fields of material science and engineering technology and chemistry. [0004] (3) Background technology [0005] Heterogeneous catalysts can drive reactions in liquid or gas phase processes such as petroleum refining and chemical polymerization. Generally speaking, heterogeneous catalysts include solid supports such as metal oxides and carbon materials and metal materials such as granular Pt and Ru supported on them, and they have good stability in all pH ranges. However, due to the scarcity of reserves and high cost, noble metal catalysts cannot meet the actual demand. As far as is known, for supported catalysts, the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J27/24
CPCB01J23/42B01J27/24
Inventor 黄凯雷鸣王茹玥张茹
Owner BEIJING UNIV OF POSTS & TELECOMM
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