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Monoatomic gold catalyst and preparation method and application thereof

A catalyst, atomic gold technology, applied in the field of catalyst preparation, to achieve the effect of simple preparation method, high atom utilization rate, and simplified synthesis steps

Inactive Publication Date: 2019-11-12
北京氦舶科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Au prepared by this method belongs to the nanoscale
At present, there are no relevant reports on the application of single-atom catalysts in the epoxidation of styrene.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0023] The preparation method of the single-atom gold catalyst of the present invention comprises the following steps: preparing magnesium-cobalt-aluminum layered composite hydroxide containing gold anions in situ by co-precipitation method, and then undergoing hydrogen reduction treatment so that the active component gold is atomically The form is uniformly dispersed between and on the surface of the nanosheets of the magnesium-cobalt-aluminum layered composite hydroxide to prepare a single-atom gold catalyst.

[0024] In the preparation method of the above-mentioned single-atom gold catalyst, the magnesium-cobalt-aluminum layered composite hydroxide containing gold anions is composed of magnesium-cobalt-aluminum layered composite hydroxide nanosheets and adsorbed on magnesium-cobalt-aluminum layered composite hydroxide nanosheets The composition of gold anions between the layers and on the surface.

[0025] The preparation method of above-mentioned monoatomic gold catalyst s...

Embodiment 1

[0036] 1. Add cobalt nitrate, aluminum nitrate, magnesium nitrate and chloroauric acid into deionized water to form a mixed solution with a total ion concentration of 3mol / L. The molar ratio of magnesium nitrate, cobalt nitrate, aluminum nitrate and chloroauric acid is 1.5: 0.5:1:0.002; add NaOH to deionized water to make a precipitant solution with a concentration of 1mol / L; under room temperature and 500r / min stirring conditions, slowly add the precipitant solution to the mixed solution until the system The pH value of the solution reaches 8.5-9. After the dropwise addition, continue to stir for 10 minutes, centrifuge the reaction solution after crystallization at 120°C for 12 hours, wash until neutral, and dry at 60°C to obtain a magnesium-cobalt-aluminum layered composite hydroxide containing gold anions things.

[0037]2. Reducing the magnesium-cobalt-aluminum layered composite hydroxide containing gold anions obtained in step 1 in a 10% H2 / He atmosphere at 200° C. for 0....

Embodiment 2

[0040] 1. Add cobalt nitrate, aluminum nitrate, magnesium nitrate and chloroauric acid into deionized water to form a mixed solution with a total ion concentration of 3mol / L. The molar ratio of magnesium nitrate, cobalt nitrate, aluminum nitrate and chloroauric acid is 0.5: 1.5:1:0.002; add NaOH to deionized water to make a precipitant solution with a concentration of 2mol / L; under room temperature and 500r / min stirring conditions, slowly add the precipitant solution to the mixed solution until the system pH=8.5-9, after the dropwise addition, continue to stir for 10min, centrifuge the reaction solution after crystallization at 120°C for 12h, wash until neutral, and dry at 60°C to obtain a magnesium-cobalt-aluminum layered composite hydroxide containing gold anions .

[0041] 2. Reducing the magnesium-cobalt-aluminum layered composite hydroxide containing gold anions obtained in step 1 in a 10% H2 / He atmosphere at 200° C. for 0.5 h to obtain a single-atom Au catalyst with an A...

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PUM

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Abstract

The invention particularly relates to a method for preparing a monoatomic gold catalyst. The method for preparing the monoatomic gold catalyst comprises the following steps that a magnesium cobalt aluminum layered composite hydroxide containing a gold anion is prepared in situ by a coprecipitation method, and then the active component gold is uniformly dispersed between nanosheet layers of the magnesium cobalt aluminum layered composite hydroxide and the surfaces in the form of atomic scale after hydrogen reduction treatment to prepare the monoatomic gold catalyst. The method for preparing themonoatomic gold catalyst is simple and environmentally friendly, and has low cost and industrial application value, the monoatomic gold catalyst is used for epoxidation of styrene to prepare phenyloxirane, and has the characteristics of high activity, high selectivity and reusability.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and in particular relates to a single-atom gold catalyst, a preparation method thereof and an application in the preparation of styrene oxide by epoxidation of styrene. Background technique [0002] Styrene oxide is an important fine chemical with a molecular formula of C8H8O. It is widely used in the production of flavors and sweeteners such as β-phenylethyl alcohol, drug insect repellants, levamisole, and phenylacetaldehyde. It is also a synthetic Intermediates of other organic compounds and polymers. The traditional preparation methods of styrene oxide include haloalcohol method or peracid method. These traditional methods not only have many steps, but also produce a large number of by-products, causing serious environmental pollution. The preparation of fine chemicals by clean catalytic process is the main way of fine chemicals production in the future. Directly using oxygen a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07D301/10C07D303/04
CPCB01J23/8913C07D301/10C07D303/04
Inventor 郭文雅郎嘉良伍晖赵刚黄翟
Owner 北京氦舶科技有限责任公司
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