Device and method for synthesizing ammonia through photoelectrocatalysis nitrogen fixation

An ammonia synthesis device and photoelectric catalysis technology, which are applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Side reactions, improving photoelectric catalytic efficiency, and avoiding the effect of hydrogen evolution reaction

Active Publication Date: 2019-08-02
TAIYUAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the low efficiency of photocatalytic nitrogen fixation and serious side reactions of hydrogen evolution in the prior art, the present invention aims to provide a method for photocatalytic nitrogen fixation to synthesize ammonia, which can not only improve the efficiency of photocatalytic nitrogen fixation, but also effectively reduce the side reactions of hydrogen evolution

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  • Device and method for synthesizing ammonia through photoelectrocatalysis nitrogen fixation
  • Device and method for synthesizing ammonia through photoelectrocatalysis nitrogen fixation
  • Device and method for synthesizing ammonia through photoelectrocatalysis nitrogen fixation

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Embodiment 1

[0035] Such as Figures 1 to 3 Shown, a kind of photoelectric catalytic nitrogen fixation ammonia synthesis device, it comprises the photoelectric composite membrane that is made up of bipolar membrane and nanometer nitrogen-fixing catalytic membrane and separates anode chamber and cathode chamber into double-chamber electrolyzer, and described bipolar membrane comprises anion exchange membrane and Cation exchange membrane, nano nitrogen-fixing catalyst film loaded on the surface of the cation exchange membrane, the anode chamber is filled with electrolyte aqueous solution, the cathode chamber is filled with nitrogen, and BiVO 4 The electrode is used as the anode, the nitrogen-fixing catalyst film is used as the cathode, and the cathode chamber is equipped with a container filled with dilute sulfuric acid to absorb the generated ammonia. A 300W xenon lamp is used as the light source, and a DC power supply is added to provide the electric field force. The positive and negative e...

Embodiment 2

[0046] Such as Figures 1 to 3 Shown, a kind of photoelectric catalytic nitrogen fixation ammonia synthesis device, it comprises the photoelectric composite membrane that is made up of bipolar membrane and nanometer nitrogen-fixing catalytic membrane and separates anode chamber and cathode chamber into double-chamber electrolyzer, and described bipolar membrane comprises anion exchange membrane and Cation exchange membrane, nano nitrogen-fixing catalyst film loaded on the surface of the cation exchange membrane, the anode chamber is filled with electrolyte aqueous solution, the cathode chamber is filled with nitrogen, and BiVO 4 The electrode is used as the anode, the nitrogen-fixing catalyst film is used as the cathode, and the cathode chamber is equipped with a container filled with dilute sulfuric acid to absorb the generated ammonia. A 300W xenon lamp is used as the light source, and a DC power supply is added to provide the electric field force. The positive and negative e...

Embodiment 3

[0057] Such as Figures 1 to 3 Shown, a kind of photoelectric catalytic nitrogen fixation ammonia device, it comprises the photoelectric composite membrane that is made up of bipolar membrane and nanometer nitrogen-fixing catalytic membrane and anode chamber and cathode chamber are separated into double-chamber electrolyzer, and described bipolar membrane comprises anion exchange membrane and Cation exchange membrane, the nanometer nitrogen-fixing catalyst film is loaded on the surface of the cation exchange membrane, the anode chamber is filled with electrolyte aqueous solution, the cathode chamber is filled with nitrogen, the Pt electrode is used as the anode, the nitrogen-fixing catalyst film is used as the cathode, and the cathode chamber is provided with a container containing dilute sulfuric acid for To absorb the generated ammonia gas, a 300W xenon lamp is used as the light source, and a DC power supply is added to provide the force of the electric field. The positive an...

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Abstract

The invention provides a device and a method for synthesizing ammonia through photoelectrocatalysis nitrogen fixation and relates to the technical field of electro-catalysis electrolysis. The device for synthesizing ammonia through photoelectrocatalysis nitrogen fixation comprises a photoelectric composite membrane, wherein the photoelectric composite membrane consists of a bipolar membrane and anano nitrogen fixation catalysis membrane and is used for dividing an anode chamber and a cathode chamber into a double-chamber electrolytic bath; the bipolar membrane comprises an anion exchange membrane and a cation exchange membrane; the nano nitrogen fixation catalysis membrane is carried on the surface of the cation exchange membrane; an electrolyte solution is put into the anode chamber; thecathode chamber is filled with nitrogen; a BiVO4 or Pt electrode is adopted as an anode; a nitrogen fixation catalyst membrane is used as a cathode; a container filled with dilute sulfuric acid is arranged in the cathode chamber and is used for absorbing generated ammonia gas; a xenon lamp is adopted as a light source; an external direct-current power supply is adopted to provide electric field force; a positive pole and a negative pole of the external direct-current power supply are respectively connected with the anode and the cathode. The device is adopted for photoelectrocatalysis nitrogen fixation in a non-water solution, and has benefits that hydrogen evolution side reactions can be effectively inhibited, and the photoelectrocatalysis nitrogen fixation efficiency can be improved.

Description

technical field [0001] The invention relates to the technical field of photoelectric catalysis and electrolysis, in particular to a device and method for photoelectric catalysis nitrogen fixation and synthesis of ammonia. Background technique [0002] Nitrogen molecule is a highly stable elemental substance, and its triple bond energy is 94l KJ.mol -1 , high inertness, not easy to activate. Nitrogen-fixed ammonia is N 2 In the process of step-by-step combination with photogenerated electrons and protons, there is a serious hydrogen evolution competition reaction in the process of nitrogen fixation, resulting in a significant decrease in ammonia synthesis efficiency. At present, most of the research on improving the efficiency of photocatalytic nitrogen fixation focuses on the research on the catalyst itself, such as adjusting the particle size of the catalyst, active adsorption sites, changing the electron transfer pathway, and the electron density distribution of interfac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/00C25B9/06C25B9/08C25B11/06B01J27/24B01J27/13B01J21/10B01J23/46B01J35/02C25B9/17C25B9/19
CPCB01J35/0033B01J27/24B01J27/13B01J21/10B01J23/462B01J35/02C25B9/19C25B1/55C25B11/093Y02E60/36
Inventor 刘宪文斌董金龙赵婷婷
Owner TAIYUAN NORMAL UNIV
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