Electro-catalysis nitrogen fixation device and method for simultaneously generating nitric acid and ammonia double products

A technology of nitric acid and nitrogen fixation, applied in electrodes, electrolytic components, electrolytic processes, etc., can solve the problems of low ammonia yield, poor selectivity, high comprehensive cost, etc., achieve low energy consumption, increase yield and reaction rate, and adjustability strong effect

Pending Publication Date: 2022-07-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a dual-product electrocatalytic nitrogen fixation device and method that simultaneously generates nitric acid and ammonia based on the limitations of the existing nitrogen fixation technology, so as to solve the problem of low ammonia yield, poor selectivity, and excessive overall cost in the existing electrocatalytic nitrogen fixation process. High-level problems, through the improved design of the H-type electrolytic cell to efficiently convert NO x Nitric acid and ammonia are synthesized in the double pool respectively, and the ternary alloy catalyst enhances the selectivity and efficiency of the reaction. This method has the characteristics of simple equipment process, high processing efficiency, diversified products and good compatibility with renewable energy.

Method used

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  • Electro-catalysis nitrogen fixation device and method for simultaneously generating nitric acid and ammonia double products
  • Electro-catalysis nitrogen fixation device and method for simultaneously generating nitric acid and ammonia double products
  • Electro-catalysis nitrogen fixation device and method for simultaneously generating nitric acid and ammonia double products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-12

[0043] The surface of the single-sided carbon paper was uniformly covered with copper atoms by the method of magnetron sputtering, the sputtering thickness was 100 nm, and an argon atmosphere was used during sputtering. The carbon paper covered with copper was put into the electrodeposition electrolytic cell as the working electrode, and the electrolyte was 50ml of 0.05M dilute sulfuric acid, and 0.29g of cobalt nitrate hexahydrate and 0.29g of nickel nitrate hexahydrate were added, and the electrolytic solution was charged at a current of 0.2A. Deposit for 5min, rinse the impurities and electrolyte on the surface with deionized water, put it into a drying oven and dry to make the working electrode of the improved H-type electrolytic cell (5);

[0044] Take 60ml of 1M KOH solution into the cathode in the reaction vessel, take 60ml of 0.5M H 2 SO 4 The solution is put into the anode in the reaction vessel, separated by a bipolar membrane in the middle, the reaction vessel is p...

Embodiment 13-18

[0050] The surface of the single-sided carbon paper was uniformly covered with copper atoms by the method of magnetron sputtering, the sputtering thickness was 100 nm, and an argon atmosphere was used during sputtering. The carbon paper covered with copper is put into the electrodeposition electrolytic cell as the working electrode, and the electrolyte is 50ml of 0.05M dilute sulfuric acid, and a total of 0.02mol of cobalt nitrate and nickel nitrate of different proportions is added, and electrodeposited under the current of 0.2A. 5min, rinse the impurities and electrolyte on the surface with deionized water, put it into a drying box and dry to make the working electrode of the H-type electrolytic cell 6;

[0051] Take 60ml of 1M KOH solution into the cathode in the reaction vessel, take 60ml of 0.5M H 2 SO 4 The solution is put into the anode in the reaction vessel, separated by a bipolar membrane in the middle, the reaction vessel is placed on a magnetic stirrer, the rotati...

Embodiment 19-30

[0056] The surface of the single-sided carbon paper was uniformly covered with copper atoms by the method of magnetron sputtering, the sputtering thickness was 100 nm, and an argon atmosphere was used during sputtering. The carbon paper covered with copper was put into the electrodeposition electrolytic cell as the working electrode. The electrolyte was 50ml of 0.05M dilute sulfuric acid, 0.01mol of cobalt nitrate and 0.01mol of nickel nitrate were added, and the electrodeposition was carried out at a current of 0.2A for 5min. The impurities and electrolyte on the surface are washed with deionized water, put into a drying box and dried to make the working electrode of the H-type electrolytic cell 6;

[0057] The cathode and the anode in the reaction vessel are all added with 60ml of 1M KOH, the middle is separated by a proton exchange membrane, the reaction vessel is placed on a magnetic stirrer, the rotating speed is set to 200rpm, and the mass flow meter is used to control th...

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Abstract

The invention discloses a bidirectional electrocatalytic nitrogen fixation device and method capable of simultaneously generating nitric acid and ammonia, NOx gas is reduced into NH3 at a cathode and oxidized into NO3 <-> at an anode based on an improved H-type electrolytic tank, and efficient harmless treatment and high-value utilization of harmful waste gas NOx are realized. A working electrode catalyst in an electrolysis system is prepared by simultaneously utilizing physical deposition and chemical growth methods, a layer of Cu particles uniformly covers carbon paper by utilizing a magnetron sputtering means, Ni and Co particles are deposited on a Cu surface layer by utilizing an electrochemical deposition method, and a ternary alloy electrocatalyst is prepared; and the efficient increase of the chemical reaction rate is promoted by cooperating with the catalytic action of multi-metal multi-active sites. According to the invention, harmless treatment of NOx gas and synthesis of ammonia and nitric acid are realized, extremely high ammonia yield and selectivity are achieved, and high-valued resource utilization of pollutants containing nitrogen and the like is facilitated.

Description

technical field [0001] The invention belongs to the technical field of electrocatalysis and ternary alloy catalysts in ammonia synthesis and energy storage, and in particular relates to an improved electrocatalytic reactor, which can simultaneously reduce NO x The gas undergoes two-way synthesis, while producing industrially valuable nitric acid and ammonia. Background technique [0002] NO x It is the main pollutant in industrial emissions, which can produce acid rain, destroy the ozone layer, and endanger the human respiratory system. for NO x For the treatment, the current method is to use selective catalytic reduction (SCR). SCR passes NH at 300-400°C 3 selectively NO x revert to N 2 , thus by consuming NH 3 will be NO x Reduced to harmless nitrogen. But this method consumes high industrial value of NH 3 , producing N of low industrial value 2 . in order to reduce NO x Synthesis of high industrial value NH while polluting 3 , using an electrically driven ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25B1/27C25B1/22C25B1/50C25B9/19C25B11/089C25B11/054
CPCC25B1/27C25B1/22C25B1/50C25B9/19C25B11/089C25B11/054
Inventor 吴昂键吕嘉葆李晓东叶秋麟严建华
Owner ZHEJIANG UNIV
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