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A kind of molybdenum single-atom catalyst and its preparation method and application

A catalyst and atomic technology, which is applied in the field of electrocatalyst preparation, can solve the problem that the research on the influence of reduction performance is not very deep, and achieve the effect of improving the electrocatalytic nitrogen reduction rate, improving Faraday efficiency, and improving charge density

Active Publication Date: 2022-03-01
SUZHOU UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the research on the effect of heteroatom doping on the performance of single-atom electrocatalytic nitrogen reduction is not very in-depth, and there is a gap, and there is great exploration significance here

Method used

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  • A kind of molybdenum single-atom catalyst and its preparation method and application
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preparation example Construction

[0030] The invention provides a method for preparing a molybdenum single-atom catalyst for nitrogen reduction. The invention uses Mo-based catalysts as the research object of nitrogen reduction. Since Mo belongs to one of the key elements for nitrogen fixation by nitrogenase, it has a good imitation effect and can Effectively improve the performance of nitrogen reduction; in addition, through the regulation of the coordination environment around the Mo single atom, the introduction of nitrogen (N) and sulfur (S) heteroatoms can significantly improve the electronic structure around the Mo single atom, thereby improving Its charge density greatly improves its catalytic performance; the multi-channel carbon fiber prepared by electrospinning can significantly increase the contact area between the active center of the catalyst and the reactant, and accelerate the charge transfer and material transport, and finally further improve the electrocatalytic nitrogen. Restored performance. ...

Embodiment 1

[0035] This embodiment provides a synthesis and performance testing process of a molybdenum single-atom catalyst. The specific steps are as follows:

[0036] First dissolve polyacrylonitrile in N,N-dimethylformamide, at this time the mass concentration of polyacrylonitrile is 10%, and stir at room temperature for 12 hours until a uniform white solution is formed, then add polyacrylonitrile Methyl methacrylate. At this time, the mass ratio of polyacrylonitrile to polymethyl methacrylate is 3:4, and it is placed in a constant temperature heating magnetic stirrer at 60°C and continuously stirred until a uniform solution is formed, and then poured into it Ammonium thiomolybdate powder was added so that the mass ratio of the metal molybdenum source to the polyacrylonitrile of the electrospinning solution was 1:10, and stirred again at room temperature for 12 hours until a uniform dark brown solution was formed. Use a 5mL medical syringe to draw a certain amount of the prepared elec...

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Abstract

The invention provides a molybdenum single-atom catalyst as well as its preparation method and application. The preparation method comprises: adding a molybdenum source into an electrospinning solution to prepare a precursor mixed solution; performing electrospinning on the precursor mixed solution to form an electrospun film; drying the electrospun film to dry the dried After the electrospun film is subjected to pre-oxidation treatment and carbonization treatment, a molybdenum atom catalyst is obtained. The molybdenum single-atom catalyst prepared by the above preparation method can effectively catalyze the reduction of nitrogen to prepare ammonia.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a molybdenum single-atom catalyst, and belongs to the technical field of electrocatalyst preparation. Background technique [0002] As an important chemical raw material, ammonia is widely used in agriculture, chemical industry, medicine and energy storage. However, the industrial production of ammonia relies heavily on the Haber-Bosch process, which needs to be carried out under high temperature (350-550°C) and high pressure (150-350atm) conditions, which consumes a lot of energy and generates greenhouse gases [Nat.Catal.,2019, 2, 448-456]. Therefore, in this case, it is urgent to develop a low-energy, environment-friendly technology to replace the traditional Haber-Bosch process. Electrochemical nitrogen reduction has shown a promising and attractive strategy as an energy-efficient and environmentally friendly method for ammonia synthesis under ambie...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B11/054C25B11/065C25B11/031C25B11/075C25B1/27D04H1/4382D04H1/728D06C7/04
CPCC25B11/054C25B11/065C25B11/031C25B11/075C25B1/27D04H1/728D04H1/43835D06C7/04
Inventor 邹贵付李路王昊赵杰
Owner SUZHOU UNIV
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