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A device and method for electrocatalytic nitrogen reduction synthesis of ammonia with salt bridges instead of nafion membranes

A technology for catalyzing nitrogen and synthesizing ammonia, which is applied in the direction of electrolysis components, electrolysis process, cells, etc., can solve the problems of ammonia measurement error and inability to accurately evaluate catalyst performance, and achieve the goal of eliminating diffusion, realizing long-term stable operation, and realizing objective and accurate evaluation Effect

Active Publication Date: 2022-01-18
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problem that the ammonia produced in the NRR process will adsorb and diffuse to a certain extent on the Nafion membrane in the H-type electrolytic cell, resulting in errors in the measurement of ammonia in the NRR process, and ultimately unable to make an objective and accurate evaluation of the performance of the catalyst question

Method used

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  • A device and method for electrocatalytic nitrogen reduction synthesis of ammonia with salt bridges instead of nafion membranes
  • A device and method for electrocatalytic nitrogen reduction synthesis of ammonia with salt bridges instead of nafion membranes
  • A device and method for electrocatalytic nitrogen reduction synthesis of ammonia with salt bridges instead of nafion membranes

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Embodiment 1

[0024] Such as figure 1 As shown, an electrocatalytic nitrogen reduction ammonia synthesis device that replaces the Nafion membrane with a salt bridge includes an anode cell 3 and a cathode cell 6 filled with an electrolyte 9, and an anode plate 4 is suspended inside the anode cell 3 and immersed in the electrolyte , the anode plate 4 is connected to the positive pole of the power supply 1 through a wire, the cathode plate 5 and the reference electrode 8 are suspended inside the cathode pool 6 and immersed in the electrolyte, and the inside of the cathode pool 6 is provided with a nitrogen gas inlet pipeline 7 and immersed in the electrolyte , the top of the cathode pool 6 is also provided with a gas outlet 10, the cathode plate 5 is connected to the negative pole of the power supply 1 through a wire, and the anode pool 3 and the cathode pool 6 filled with electrolyte are connected through a salt bridge 2, and the salt bridge 2 is U-shaped The round or square pipes are made of...

Embodiment 2

[0026] The present invention was compared to ammonia diffusion in conventional devices equipped with Nafion membranes (Nafion 115, Nafion 117 and Nafion 211). The specific operation is as follows: 30 mL of ammonia-containing KOH electrolyte (the ammonia concentration is 2 μg mL -1 ), while 30mL of ammonia-free KOH electrolyte is housed in the anode cell. The material of the salt bridge is selected from glass, and the inside is filled with saturated potassium chloride solution. The two ports of the salt bridge are sealed with agar-containing absorbent cotton and immersed in the electrolyte. The change of the ammonia concentration of the electrolyte in the anode pool of the two devices with the equilibrium time was measured respectively by Nessler's reagent spectrophotometry, as figure 2 As shown, in the traditional device equipped with Nafion membrane, the ammonia concentration of the electrolyte in the anode cell showed an upward trend with the increase of the equilibrium ti...

Embodiment 3

[0028] Inject 30mL (0.1M KOH) electrolyte into the cathode cell and the anode cell respectively to load RuO 2 1×1cm 2 The carbon paper (loading capacity 0.1mg) is the cathode plate, the platinum sheet is the anode plate, the Hg / HgO (1M KOH) electrode is the reference electrode, the material of the salt bridge is selected from plexiglass, and the interior is filled with saturated sodium chloride solution, salt The two ports of the bridge are sealed with glass sand cores and immersed in the electrolyte. Open the inlet of the nitrogen gas inlet line, at 20mL min -1 After passing high-purity nitrogen (99.999% purity) at a flow rate for 30 minutes, turn on the power switch, set the required voltage to carry out the nitrogen reduction process at the potential of -0.15V vs. reversible hydrogen electrode (RHE), and the electrolysis time is 2 hours. Nessler's reagent spectrophotometry was used to detect the change of absorbance of the electrolyte in the cathode cell and the anode cel...

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Abstract

The invention belongs to the technical fields of chemical industry and electrocatalysis, and relates to a device and method for electrocatalytic nitrogen reduction synthesis of ammonia with a salt bridge instead of a Nafion membrane. The anode plate is immersed in the electrolyte, the anode plate is connected to the positive pole of the power supply through a wire, the cathode plate and the reference electrode are suspended inside the cathode pool and immersed in the electrolyte, and the cathode pool is equipped with a nitrogen gas inlet pipeline and immersed in the electrolyte Among them, the top of the cathode cell is also provided with a gas outlet, the cathode plate is connected to the negative electrode of the power supply through a wire, and the anode cell and the cathode cell containing the electrolyte are connected through a salt bridge. The invention has the following advantages. First, it can eliminate the influence of the diffusion and adsorption of ammonia on the Nafion membrane to the determination of the ammonia concentration, and realize the objective and accurate evaluation of the catalyst. Second, the long-term stable operation of the NRR process can be realized. The third is that compared with Nafion membrane, the cost is reduced.

Description

technical field [0001] The invention relates to an electrocatalytic nitrogen reduction synthesis ammonia device and a method for replacing a Nafion membrane with a salt bridge, and belongs to the technical fields of chemical industry and electrocatalysis. Background technique [0002] Ammonia (NH 3 ) is an important chemical product, which has a wide range of applications and irreplaceable status in many fields. In industry, the traditional Haber-Bosch method is currently used to synthesize ammonia. This method has problems such as harsh operating conditions (300-550°C, 200-350atm), high energy consumption, and serious environmental pollution. Therefore, it is necessary to develop new green new technology. Electrocatalytic nitrogen reduction synthesis ammonia (NRR) at room temperature is one of the hotspots at home and abroad. This technical route has outstanding advantages such as mild operating conditions and direct use of water as a proton source. The H-type electrolyt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B9/17C25B1/27C25B9/65
CPCC25B1/00C25B9/65C25B9/17
Inventor 邱介山任勇文于畅谭新义韩晓彤黄红菱黄华伟
Owner DALIAN UNIV OF TECH
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