Preparation method and use method of core-shell catalyst for carbon dioxide hydrogenation

A core-shell structure, carbon dioxide technology, applied in the direction of catalyst activation/preparation, carbon monoxide, physical/chemical process catalysts, etc., can solve the problems of poor thermal stability, easy sintering of copper catalysts, etc., to promote adsorption, and the preparation method is simple, efficient, and good The effect of catalytic activity

Active Publication Date: 2019-04-05
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the RWGS reaction, the higher the temperature, the more favorable the reaction is, but the copper catalyst is easy to sinter at high temperature and has poor thermal stability, which is difficult to meet the needs.

Method used

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  • Preparation method and use method of core-shell catalyst for carbon dioxide hydrogenation
  • Preparation method and use method of core-shell catalyst for carbon dioxide hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mix 45 g of copper nitrate solution with a mass fraction of 5% and 45 g of a zinc nitrate aqueous solution with a mass fraction of 5%, and stir at room temperature for 30 minutes to obtain a mixed solution A;

[0042] (2) Weigh 36.5 g of cetyltrimethylammonium bromide aqueous solution with a mass fraction of 10%, mix it with 84.6 g of a prepared sodium carbonate aqueous solution with a mass fraction of 5%, and stir at room temperature for 1 hour, Obtain mixed solution B;

[0043] (3) Slowly add the mixed solution A and the mixed solution B into a three-necked flask containing 50 g of water by co-precipitation method under stirring at 60 °C. The pH value of the solution in the flask is about 8, until the dropwise addition of the mixed solution A is completed, continue to stir for 2 hours, then stop heating, cool to room temperature, then repeatedly wash with deionized water, suction filter until the filtrate is neutral, and the filter cake passes through After dryin...

Embodiment 2

[0048] (1) Mix 45 g of copper nitrate solution with a mass fraction of 5% and 45 g of a zinc nitrate aqueous solution with a mass fraction of 5%, and stir at room temperature for 30 minutes to obtain a mixed solution A;

[0049] (2) Weigh 18.3 g of a 10% polyvinylpyrrolidone aqueous solution, mix it with 110.1 g of a prepared 5% sodium carbonate aqueous solution, and stir at room temperature for 1 hour to obtain a mixed solution B;

[0050] (3) Slowly add mixed solution A and mixed solution B into a three-necked flask containing 40 g of water by co-precipitation method under stirring at 50 °C. The pH value of the solution in the flask is about 8, until the dropwise addition of the mixed solution A is completed, continue to stir for 2 hours, then stop heating, cool to room temperature, then repeatedly wash with deionized water, suction filter until the filtrate is neutral, and the filter cake passes through After drying at 80°C for 4 hours, continue drying at 120°C for 2 hours ...

Embodiment 3

[0055] (1) Mix 45 g of copper nitrate solution with a mass fraction of 5% and 45 g of a zinc nitrate aqueous solution with a mass fraction of 5%, and stir at room temperature for 30 minutes to obtain a mixed solution A;

[0056] (2) Weigh 30.4 g of an aqueous solution of polyethylene glycol with a mass fraction of 10%, mix it with 63.9 g of a prepared aqueous sodium carbonate solution with a mass fraction of 5%, and stir at room temperature for 1 hour to obtain a mixed solution B;

[0057] (3) Slowly add mixed solution A and mixed solution B into a three-necked flask containing 40 g of water by co-precipitation method under stirring at 60 °C. The pH value of the solution in the flask is about 8, until the dropwise addition of the mixed solution A is completed, continue to stir for 2 hours, then stop heating, cool to room temperature, then repeatedly wash with deionized water, suction filter until the filtrate is neutral, and the filter cake passes through After drying at 80°C ...

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Abstract

The invention provides a preparation method and a use method of a core-shell catalyst for carbon dioxide hydrogenation. The method includes the steps: firstly, synthesizing a copper-oxide-containing and zinc-oxide-containing mixed metal oxide precursor with catalytic activity; secondly, preparing a copper nano-particle composite material coated by MOFs of ZIF-8 in a solid phase etching manner; performing procedure heating roasting to obtain a copper-zinc alloy core-shell catalyst coated by nitrogen-doped carbon materials. The method is characterized in that a MOFs material ZIF-8 is prepared bya solid-phase etching method without solvents, carbon material shell layer containing a lot of pyridine nitrogen is acquired in a high-temperature calcination manner, a copper zinc alloy core is acquired, a novel preparation technique of a pyridine nitrogen-doped carbon material and a copper zinc alloy is developed, the core-shell catalyst is applied to carbon monoxide reaction prepared by carbondioxide hydrogenation, the core-shell catalyst has excellent catalytic activity, and catalytic effects of the copper zinc alloy are greatly facilitated in the presence of a lot of pyridine nitrogen.

Description

technical field [0001] The invention proposes a method for preparing a core-shell structure catalyst for carbon dioxide hydrogenation and a method for using it, belonging to the technical field of material synthesis and application. The catalyst uses mixed metal oxides as precursors, generates MOFs through solid phase etching, and effectively combines the nitrogen-containing carbon layer with the metal core. During the roasting process, the metal core will undergo phase transformation to form an alloy. The preparation method of the core-shell structure catalyst is simple and efficient, and it is used to catalyze the hydrogenation reaction of carbon dioxide, and has good catalytic activity. Background technique [0002] Among the various challenges faced by human beings in the 21st century, global warming caused by the greenhouse effect is one of the most serious issues. As the largest developing country, our country emits a huge amount of carbon dioxide every year, and fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J37/03B01J37/10B01J37/08C01B32/40
CPCB01J27/24B01J35/008B01J37/03B01J37/086B01J37/10C01B32/40
Inventor 李伟胡小松关庆鑫
Owner NANKAI UNIV
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