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Preparation of a cobalt oxyhydroxide nanosheet-supported cobalt-mof composite catalyst and its application in nitrogen fixation

A cobalt oxyhydroxide and composite catalyst technology, which is applied in organic compound/hydride/coordination complex catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of high bond energy destruction and low NH3 yield, etc. problems, achieve the effects of low reaction energy consumption, enhanced electrochemical catalytic activity, and simple preparation process

Active Publication Date: 2022-01-11
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the NRR process requires a high overpotential to break the N≡N triple bond with a high bond energy (941kJˑmol -1 ), and is severely hampered by the competing side reactions of the cathodic hydrogen evolution reaction (HER), which is leading to a Faradaic efficiency (FE) of less than 10% or even less than 1% and NH 3 Important reasons for low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 A preparation method of cobalt oxyhydroxide nanosheet-supported cobalt MOF composite catalyst

[0027] Mix 0.28 g cobalt nitrate with 0.20 g trimesic acid H 3 Dissolve BTC in 4 mL of N,N-dimethylformamide, and dissolve it with ultrasound to obtain a magenta transparent solution;

[0028] Move the solution into a reaction kettle, add 0.1 g of cobalt oxyhydroxide powder, and heat to 130 °C for 24 h;

[0029] Wash with water and ethanol respectively and centrifuge three times to obtain a purple-gray powder; dry at 85°C to constant weight to obtain Co 3 (BTC) 2 @CoOOH composite material, that is, cobalt oxyhydroxide nanosheet supported cobalt MOF composite catalyst.

[0030] Described cobalt oxyhydroxide powder, preparation method is as follows:

[0031] Blend 1.56 g of cobalt chloride with a mixed solution consisting of 4 mL of ethylene glycol and 1.5 mL of water. After ultrasonic dissolution, adjust the pH to 9 with ammonia water, transfer to a reaction kett...

Embodiment 2

[0033]Example 2 A preparation method of cobalt oxyhydroxide nanosheet-supported cobalt MOF composite catalyst

[0034] Mix 0.29 g cobalt nitrate with 0.21 g trimesic acid H 3 Dissolve BTC in 5 mL of N,N-dimethylformamide, and sonicate it to obtain a magenta transparent solution;

[0035] Move the solution into a reaction kettle, add 0.15 g of cobalt oxyhydroxide powder, and heat to 130 °C for 24 h;

[0036] Wash with water and ethanol respectively and centrifuge three times to obtain a purple-gray powder; dry at 85°C to constant weight to obtain Co 3 (BTC) 2 @CoOOH composite material, that is, cobalt oxyhydroxide nanosheet supported cobalt MOF composite catalyst.

[0037] Described cobalt oxyhydroxide powder, preparation method is as follows:

[0038] Blend 1.58 g of cobalt chloride with a mixed solution consisting of 5 mL of ethylene glycol and 1.7 mL of water. After ultrasonic dissolution, adjust the pH to 9 with ammonia water, transfer to a reaction kettle, and heat to ...

Embodiment 3

[0040] Example 3 A preparation method of cobalt oxyhydroxide nanosheet-supported cobalt MOF composite catalyst

[0041] Mix 0.30 g cobalt nitrate with 0.22 g trimesic acid H 3 BTC was dissolved in 6 mL of N,N-dimethylformamide, and ultrasonically dissolved to obtain a magenta transparent solution;

[0042] Move the solution into a reaction kettle, add 0.2 g of cobalt oxyhydroxide powder, and heat to 130 °C for 24 h;

[0043] Wash with water and ethanol respectively and centrifuge three times to obtain a purple-gray powder; dry at 85°C to constant weight to obtain Co 3 (BTC) 2 @CoOOH composite material, that is, cobalt oxyhydroxide nanosheet supported cobalt MOF composite catalyst.

[0044] Described cobalt oxyhydroxide powder, preparation method is as follows:

[0045] Blend 1.60 g of cobalt chloride with a mixed solution consisting of 6 mL of ethylene glycol and 1.9 mL of water. After ultrasonic dissolution, adjust the pH to 9 with ammonia water, transfer to a reaction ke...

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Abstract

The invention discloses the preparation of a cobalt oxyhydroxide nanosheet-supported cobalt MOF composite catalyst and the application of nitrogen fixation to ammonia, and belongs to the technical fields of nanomaterials and electrochemical catalysis. The main steps are to use cobalt chloride as raw material to prepare black brown cobalt oxyhydroxide powder, and then use cobalt oxyhydroxide, cobalt nitrate and trimesic acid as raw materials to prepare cobalt oxyhydroxide nanosheets loaded with Co 3 (BTC) 2 Nanocrystalline Co 3 (BTC) 2 @CoOOH composites. The cost of raw materials used in the preparation of the catalytic material is low, the preparation process is simple, the reaction energy consumption is low, and it has industrial application prospects. The Co 3 (BTC) 2 The @CoOOH composite material is used for high-efficiency electrochemical nitrogen fixation reaction, and has good electrochemical catalytic performance and stability.

Description

technical field [0001] The invention relates to a preparation method of a cobalt oxyhydroxide nanosheet-supported cobalt MOF composite catalyst and the application of the catalyst based on the high-efficiency nitrogen fixation to ammonia reaction, belonging to the technical fields of nanomaterials, electrochemical catalysis and metal organic frameworks. Background technique [0002] Ammonia (NH 3 ) is an essential inorganic chemical with high annual production worldwide and has wide applications in many application fields, especially fertilizers, pharmaceuticals, dyes, explosives, and resins. In the past decade, ammonia has been mainly produced by the Haber-Bosch process. However, due to its stringent reaction conditions, such as 300-400 °C reaction temperature and 150-250 atm pressure, high demand energy and emit CO 2 . For this reason, it is of great significance to develop new technologies and processes for ammonia synthesis. [0003] In the presence of catalyst nitro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/28C25B1/27C25B1/50C25B11/095
CPCB01J31/28C25B1/00C25B11/095B01J35/33
Inventor 赵璐王志玲
Owner UNIV OF JINAN
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