Method and device for synthesizing ammonia from nitrogen with high-efficiency electrocatalytic reduction at low temperature and normal pressure

Abstract

The invention discloses a method and device for high-efficiency electrocatalytic reduction of nitrogen to synthesize ammonia at low temperature and normal pressure. An electrocatalytic electrolytic cell is constructed in which the anode chamber and the cathode chamber are separated by a proton exchange membrane, and carbon cloth coated with Pt catalyst is used as the anode electrode. The carbon cloth coated with sulfur-bridged double (poly)-nuclear iron cluster compound catalyst is the cathode electrode, and the anode and cathode are respectively connected to the high and low potential terminals of the regulated power supply through wires; the water-saturated H2 is oxidized on the surface of the anode electrode to produce H+ and Electrons, the generated H+ and electrons migrate to the surface of the cathode electrode through the proton exchange membrane and the external circuit respectively, and the N2, H+ and electrons provided by the cathode chamber are on the surface of the cathode electrode under the action of the catethiol bridged dinuclear iron complex catalyst Combined to generate NH3. The invention uses the nitrogenase model compound iron-sulfur cluster compound as the cathode catalyst of the electrolytic cell, which overcomes the problems of high temperature, high pressure and high energy consumption in the traditional ammonia synthesis process and the low catalytic efficiency of the cathode catalyst during electrocatalytic synthesis of ammonia.

Description

technical field [0001] The invention belongs to the technical field of electrocatalytic synthesis, and in particular relates to a method and a device for highly efficient electrocatalytic synthesis of ammonia under low temperature and normal pressure. Background technique [0002] Since the birth of the Haber (Harber) ammonia synthesis method in 1909, the method has continued and developed for more than a century. Scientific researchers are constantly innovating their technological process, developing new catalysts and catalytic additives, trying to reduce the temperature and pressure of ammonia synthesis and increase the conversion rate of nitrogen, but no matter how innovative this method is, it still cannot break through the thermodynamic limit. With the increasing demand for ammonia all over the world and the increasingly prominent problems of energy and environmental pollution, the exploration of new ammonia synthesis methods with high efficiency, low energy consumption...

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Problems solved by technology

[0004] The invention provides a method for high-efficiency electrocatalytic synthesis of ammonia under low temperature and normal pressure. The nitrogenase model compound iron-sulfur cluster compound is used as the cathode catalyst to avoid the high temperature, high pressure and high energy consumption of the traditional ammonia synthesis process and the cathode catalyst catalysis during the electrocatalytic synthesis of ammonia. The problem of low efficiency

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