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Co-based catalyst for breaking restrictive relationship of synthetic ammonia reaction and preparation method and application thereof

A catalyst and a technology for synthesizing ammonia, applied in the direction of ammonia preparation/separation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems that have not been reported yet, reduce the energy barrier of catalytic reactions, increase service life, and improve reaction speed effect

Active Publication Date: 2021-02-02
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of these intermetallic compounds as catalysts to achieve ammonia synthesis under mild conditions has not yet been reported.

Method used

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  • Co-based catalyst for breaking restrictive relationship of synthetic ammonia reaction and preparation method and application thereof
  • Co-based catalyst for breaking restrictive relationship of synthetic ammonia reaction and preparation method and application thereof
  • Co-based catalyst for breaking restrictive relationship of synthetic ammonia reaction and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] co 2 Preparation of B

[0024] Cobalt acetate (0.498 g, 0.1 M) was dissolved in deionized aqueous solution mixed with 50% methanol, and then sodium borohydride solution (0.228 g, 1 M) was added dropwise to the above solution under nitrogen flow, and after the addition was completed, Continue to react for 1 h. The subsequently formed black product was thoroughly washed three times with deionized water and three times with anhydrous methanol. get co 2 B-based catalyst.

Embodiment 2

[0026] CoF 2 preparation of

[0027] Cobalt nitrate (0.29 g), ammonium fluoride (0.12 g), and urea (0.3 g) were dissolved in 50 mL of ethylene glycol, and a homogeneous solution was formed under vigorous stirring. Then, the obtained solution was transferred into a polytetrafluoroethylene hydrothermal kettle and placed in an oven at 200 °C for 20 h. After cooling to room temperature, the pink product was collected and washed three times with water and ethanol, respectively. Get CoF 2 base catalyst.

Embodiment 3

[0029] co 2 Preparation of Si

[0030] Silicon powder (0.29 g), cobalt tetraoxide powder (0.80 g) and magnesium powder (2.40 g) were mixed and put into a 20 mL stainless steel medium-high pressure reactor. Then the high reactor was sealed and heated at 10 ℃·min -1 The heating rate was from room temperature to 750 °C and kept for 10 h. After the autoclave was naturally cooled to room temperature, the obtained precipitate was washed three times with ethanol, distilled water, and hydrochloric acid solution (0.50 M). Finally dried in vacuum at 50 °C overnight to obtain Co 2 Si-based catalyst.

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Abstract

The invention discloses a co-based catalyst for breaking restrictive relationship of synthetic ammonia reaction and a preparation method and application thereof. Co with a 3d electronic structure andnon-metallic elements (X = B, N, F and the like) with a 2p electronic structure are adopted to form a binary intermetallic CoX compound. Through hybridization of dp orbits, the position and the widthof the center of a 3d band of the Co are effectively adjusted, the bonding strength of N-containing intermediate species on active metal is effectively reduced, desorption of the N-containing intermediate species at a low temperature is promoted, the restrictive relation between N2 dissociation adsorption energy and N-containing intermediate species desorption energy existing in a traditional ammonia synthesis catalyst is broken through, and synthesis of ammonia is achieved under mild conditions. The ammonia synthesis rate is 10.8 mmol g<-1> h<-1> at 400 DEG C and 3 MPa, the preparation methodof the catalyst is simple and easy to operate, and the catalyst has a good industrial application prospect.

Description

technical field [0001] The invention belongs to the field of preparation of catalyst materials, and in particular relates to a Co-based catalyst which breaks the restrictive relation of synthetic ammonia reaction, its preparation method and application. Background technique [0002] Ammonia is an important component of food and fertilizers, a direct or indirect component of many medicines, and a basic chemical raw material to maintain human life. In addition, ammonia, as a hydrogen-rich substance (17.6 wt%), is an ideal hydrogen energy carrier and has received strong attention again. Considering the many important roles of ammonia in people's production and life, researchers focused on developing a cheap and easy-to-obtain high-efficiency ammonia synthesis catalyst under mild conditions. But since N 2 N≡N in is very stable, so the nitrogen hydrogenation reaction is kinetically very difficult, N 2 The activation of the ammonia synthesis reaction also becomes the rate-deter...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J27/128C01C1/04
CPCB01J23/75B01J27/128C01C1/0411Y02P20/52
Inventor 王秀云李玲玲江莉龙
Owner FUZHOU UNIVERSITY
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