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Nanometer bismuth catalyst and preparation method and application thereof

A technology of nano-bismuth and catalyst, which is applied in the field of nano-bismuth catalyst and its preparation, which can solve the problems of low ammonia efficiency and catalyst low activity, and achieve the effect of overcoming low efficiency and low current efficiency

Active Publication Date: 2020-06-09
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned problems existing in the prior art, the present invention provides a nano-bismuth catalyst and its preparation method and application. The present invention prepares the nano-bismuth catalyst through the interface confinement reduction method, which can effectively overcome the high energy consumption of the traditional Haber process ammonia synthesis , high pollution, low efficiency of electroreduction ammonia synthesis and low catalyst activity in traditional electrolytic cells

Method used

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  • Nanometer bismuth catalyst and preparation method and application thereof
  • Nanometer bismuth catalyst and preparation method and application thereof
  • Nanometer bismuth catalyst and preparation method and application thereof

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Embodiment 1

[0030] A nano-bismuth catalyst, comprising a carbon cloth substrate and bismuth porous nanosheets (001) coated on the carbon cloth, the loading of bismuth porous nanosheets is 0.8mg / cm 2 .

[0031] The preparation method of above-mentioned nano-bismuth catalyst comprises the following steps:

[0032] (1) Preparation of precursor bismuth oxybromide dispersion

[0033] Mix bismuth nitrate pentahydrate and hexadecyltrimethylammonium bromide at a molar ratio of 0.25:1 and place in oleylamine, disperse by ultrasonication for 2 hours to form a homogeneous solution, transfer to a solvothermal reaction kettle, and stir at 170°C for reaction 12h, the stirring rate was 350r / min, after the reaction was completed, it was washed with n-hexane, and finally dispersed in n-hexane to obtain;

[0034] (2) Preparation of active agent bismuth porous nanosheets

[0035] Mix 20mL precursor bismuth oxybromide dispersion with 60mL reducing solution, stir for 1h, after the reaction is complete, was...

Embodiment 2

[0043] A nano-bismuth catalyst, comprising a carbon cloth substrate and bismuth nano-spherical particles coated on the carbon cloth, the loading of bismuth nano-spherical particles is 1.0mg / cm 2 .

[0044] The preparation method of above-mentioned nano-bismuth catalyst comprises the following steps:

[0045] (1) Preparation of Bismuth Nanospherical Particles

[0046] Dissolve a certain quality of bismuth nitrate pentahydrate in a mixed solution of 1-hexadecylsulfur and 1-octadecene with a volume ratio of 1:1, the total volume of the solution is 10mL, and the concentration of bismuth nitrate pentahydrate in the mixed solution is generally 5-50mg / mL (preferably 15mg / mL), and then heated to 180°C with a heating rate of 5-6°C·min -1 , kept under an inert gas such as argon or nitrogen for 5 minutes. After the reaction solution is naturally cooled to room temperature, the product is collected by centrifugation to obtain bismuth nano-spherical particles;

[0047] All the above oper...

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Abstract

The invention provides a nanometer bismuth catalyst and a preparation method and application thereof. The nanometer bismuth catalyst comprises a substrate and an active agent loaded on the substrate,wherein the active agent is nanometer bismuth with an exposed crystal face (001), (012), (104) or (110). The nanometer bismuth catalyst is prepared by using an interface confinement reduction method;when the prepared nanometer bismuth catalyst is used as a cathode catalyst of a flowing electrolytic tank to electrocatalytically reduce nitrogen so as to synthesize ammonia, Faraday efficiency is upto 18.3%, and an ammonia production rate is 605.5 [mu]g / mg<-1>Bi<h<-1>>; and thus, the limitations of low efficiency, low current efficiency and the like of electrochemical ammonia synthesis in the prior art are overcome, and a commercial value is obtained.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nano-bismuth catalyst and a preparation method and application thereof. Background technique [0002] According to statistics, in 2017, global ammonia plants produced 142 million tons of ammonia using the Haber process, of which 77% of the hydrogen required for ammonia synthesis was prepared by steam reforming of methane. The use of this hydrogen source is a carbon-intensive process. The average production of 1 ton of ammonia releases 2.1 tons of carbon dioxide; the Haber ammonia synthesis process must be carried out under the harsh conditions of high temperature of 500°C and high pressure of 200atm. Energy-intensive conditions mean that more fossil fuels are consumed and more carbon dioxide is emitted. Synthetic ammonia consumes 1-2% of the world's annual energy supply and emits 1% of the world's annual carbon dioxide emissions. [0003] The ever-decreasing pric...

Claims

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Application Information

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IPC IPC(8): B01J23/18B01J35/02B01J35/08C25B1/00C25B9/08C25B11/06C25B9/19
CPCB01J23/18C25B1/00C25B9/19C25B11/051C25B11/075B01J35/33B01J35/40B01J35/51
Inventor 康毅进付先彪李辉
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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