Device and method for synthesizing ammonia through electro-catalytic nitrogen reduction by replacing Nafion membrane with salt bridge

A technology for catalyzing nitrogen and synthesizing ammonia, which is applied in the electrolysis process, electrolysis components, cells, etc., can solve the problems of inaccurate evaluation of catalyst performance and ammonia measurement error, and achieve long-term stable operation, elimination of diffusion, and cost reduction.

Active Publication Date: 2020-04-24
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

Method used

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  • Device and method for synthesizing ammonia through electro-catalytic nitrogen reduction by replacing Nafion membrane with salt bridge
  • Device and method for synthesizing ammonia through electro-catalytic nitrogen reduction by replacing Nafion membrane with salt bridge
  • Device and method for synthesizing ammonia through electro-catalytic nitrogen reduction by replacing Nafion membrane with salt bridge

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Experimental program
Comparison scheme
Effect test

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 field of chemical engineering and electrocatalysis, and discloses a device and a method for synthesizing ammonia through electro-catalytic nitrogen reduction byreplacing a Nafion membrane with a salt bridge. The device comprises an anode tank and a cathode tank which are filled with electrolytes, an anode plate is suspended in the anode tank and is immersedin the electrolyte, an anode plate is connected with a power supply positive electrode through a wire, a cathode plate and a reference electrode are suspended in the cathode tank and are immersed in the electrolyte, a nitrogen introducing pipeline is arranged in the cathode tank and is immersed in the electrolyte, a gas outlet is further formed in the top of the cathode tank, the cathode plate isconnected with a power supply negative electrode through a wire, and the anode tank and the cathode tank which contain the electrolytes are connected through the salt bridge. The device and the methodhave the following advantages: 1, the influence of diffusion and adsorption of ammonia on the Nafion membrane on ammonia concentration measurement can be eliminated, and objective and accurate evaluation of the catalyst is realized; 2, long-term stable operation of an NRR process can be realized; and 3, compared with the Nafion membrane, the salt bridge reduces the cost.

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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IPC IPC(8): C25B9/04C25B9/06C25B1/00C25B9/17
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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