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Preparation method and application of aluminum monatomic catalyst

A catalyst and atomic technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low effective utilization of aluminum, many by-products, large changes in catalytic activity, etc., to achieve inhibition Agglomeration of aluminum atoms, high effective utilization rate, and good catalytic effect

Active Publication Date: 2020-09-01
CIVIL AVIATION UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, with the gradual development of ozone depleting substances (ODS) substitutes to hydrofluoroolefins, the application of aluminum fluoride has been increasingly restricted.
First of all, due to the strong acidity of aluminum fluoride, when it is used in the catalytic synthesis of hydrofluoroolefin unsaturated compounds, there are many by-products and carbon deposition is easy to occur, resulting in a significant reduction in catalyst life; secondly, the specific surface area of ​​existing aluminum fluoride catalysts Low, the effective utilization rate of aluminum is low, and there are many solid wastes; again, the catalytic activity of aluminum fluoride is greatly affected by its own crystalline structure, and its catalytic activity also changes greatly due to the change of crystalline structure during the high-temperature reaction process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 2g of Al-based metal-organic framework material with 1,4-naphthalene dicarboxylic acid anion as organic ligand was vacuum-dried at 200°C for 8 hours, and the dried Al-based metal-organic framework material was added to 100 mL of styrene and stirred for 3 hours, then filtered and dried at room temperature for 6 hours, and then the treated Al-based MOFs were heated to 160°C at a rate of 5°C / min in a nitrogen atmosphere, kept for 12 hours, and then heated for 2 The heating rate of °C / min is raised to 900 °C, kept for 3 hours, and naturally cooled to room temperature after the end to obtain a carbonized product;

[0031] The above-mentioned carbonized product was fluorinated for 6 hours at 180°C in a mixed gas atmosphere of anhydrous hydrogen fluoride and nitrogen at a ratio of 1:1, and then fluorinated for 6 hours at 280°C in an atmosphere of pure anhydrous hydrogen fluoride. Hour. The obtained fluorinated product was washed twice in ammonia water (10% concentration) at 8...

Embodiment 2

[0034] 2g of Al-based metal-organic framework material with 2,5-diamino-1,4-phthalic acid anion as organic ligand was vacuum-dried at 200°C for 8 hours, and the dried Al-based metal-organic framework material was added to 100mL styrene and stirred for 3 hours, then filtered and dried at room temperature for 6 hours, and then the treated Al-based metal-organic framework material was heated to 160°C at a heating rate of 5°C / min in a nitrogen atmosphere, and kept 12 hours, then increase the temperature to 800°C at a heating rate of 2°C / min, keep it for 5 hours, and naturally cool to room temperature after the end to obtain a carbonized product;

[0035] The above-mentioned carbonized product was fluorinated for 6 hours at 180°C in a mixed gas atmosphere of anhydrous hydrogen fluoride and nitrogen at a ratio of 1:1, and then fluorinated for 6 hours at 280°C in an atmosphere of pure anhydrous hydrogen fluoride. Hour. The obtained fluorinated product was washed twice in ammonia wat...

Embodiment 3

[0038] 2g of Al-based metal-organic framework material with 1,4-naphthalene dicarboxylic acid anion as organic ligand was vacuum-dried at 200°C for 8 hours, and the dried Al-based metal-organic framework material was added to 100 mL of styrene and stirred for 3 hours, then filtered and dried at room temperature for 6 hours, and then the treated Al-based MOFs were heated to 160°C at a rate of 5°C / min in a nitrogen atmosphere, kept for 12 hours, and then heated for 2 The heating rate of °C / min is raised to 900 °C, kept for 3 hours, and naturally cooled to room temperature after the end to obtain a carbonized product;

[0039] The above-mentioned carbonized product was fluorinated for 6 hours at 180°C in a mixed gas atmosphere of anhydrous hydrogen fluoride and nitrogen at a ratio of 1:1, and then fluorinated for 6 hours at 280°C in an atmosphere of pure anhydrous hydrogen fluoride. Hour. The obtained fluorinated product was washed twice in ammonia water (10% concentration) at 8...

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Abstract

The invention discloses a preparation method and application of an aluminum monatomic catalyst. The preparation method comprises the following steps of: polymerizing styrene in an inner hole of an aluminum-based metal organic framework material adsorbing styrene under a heating condition, carrying out carbonization and fluorination, and then washing a fluorination product with hot ammonia water toobtain the aluminum monoatomic catalyst. The catalyst can be applied as a catalyst to dehydrohalogenation or fluorine-chlorine exchange reaction. The aluminum monatomic catalyst prepared by the invention has the advantages of simple preparation method, large specific surface area, high effective utilization rate of aluminum atoms, high catalytic performance, long service life and great application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method and application of an aluminum single-atom catalyst. Background technique [0002] Aluminum fluoride is the most representative class of inorganic materials in metal fluorides. It has a Lewis acid center and is widely used in acid-catalyzed reactions (such as: fluorine-chlorine exchange reaction, dehydrofluorination reaction, dehydrochlorination reaction, disproportionation reaction and isomerization Chemical reactions, etc.), industrially mainly used in the gas-solid phase catalytic synthesis of HCFCs and their ozone depleting substances (ODS) substitutes. However, in recent years, with the gradual development of ozone depleting substances (ODS) replacement technology to hydrofluoroolefins, the application of aluminum fluoride has been increasingly restricted. First of all, due to the strong acidity of aluminum fluoride, when it is used in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J21/02B01J35/10B01J37/26C07C17/20C07C21/18C07C21/22C07C19/08
CPCB01J31/1691B01J31/2217B01J31/2239B01J21/02B01J37/26C07C17/20B01J35/618B01J35/617C07C21/18C07C21/22C07C19/08
Inventor 周晓猛李秀涛乔俊宇
Owner CIVIL AVIATION UNIV OF CHINA
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