Double-species supported catalyst as well as preparation method and application thereof

Abstract

The invention discloses a double-species supported catalyst as well as a preparation method and application thereof, and belongs to the technical fields of material preparation, electro-catalysis and fine chemical engineering. The high-performance bismuth-lithium double-species supported phosphotungstic acid electrocatalyst for electrocatalytic nitrogen fixation is developed for the first time by taking phosphotungstic acid, a bismuth salt and lithium sulfate as raw materials, feeding in batches, heating and stirring under mild conditions, utilizing phosphotungstic acid with rich oxygen coordination sites as a carrier, and taking bismuth salt and lithium sulfate as double-species-modified precursors. The prepared electrocatalyst has good stability, excellent dinitrogen molecule adsorbing and activation capability, outstanding hydrogen evolution competitive reaction inhibition capability and good electrocatalytic performance, and the catalyst is simple in preparation process, low in cost, green and environment-friendly in production process and high in application potential.

Description

technical field [0001] The invention relates to a dual-species supported catalyst and the application of the preparation method thereof, belonging to the technical fields of material preparation, electrocatalysis and fine chemical industry. Background technique [0002] Ammonia is one of the most productive chemicals in the world, and is widely used in the production of fertilizers, plastics and explosives. At present, the global ammonia production is about 500 million tons, and it plays a very important role in food and energy chemistry. At the same time, ammonia is It is regarded as a potential hydrogen storage molecule and liquid fuel in the future. Synthetic ammonia is one of the most important inventions of the 20th century and has made significant contributions to promoting social progress. At present, the Haber-Bosch process (Haber-Bosch process) is widely used in the industry to synthesize ammonia, that is, nitrogen and hydrogen are synthesized under the conditions ...

AI Technical Summary

Problems solved by technology

However, since nitrogen reduction involves the breaking of a strong triple bond (N≡N), it is kinetically difficult to proceed, and since the hydrogen evolution potential and nitrogen reduction potential are very close, hydrogen evolution as a competing reaction will severely restrict the efficiency of nitrogen reduction to ammonia synthesis

In order to solve the above problems, many researchers have adopted different strategies to improve nitrogen reduction performance, such as defect engineering, heterojunction engineering, spatial synergy strategy or building a hydrophobic layer, etc. The patent application number CN201910483691.8 discloses nitrogen fixation at room temperature Preparation method and nitrogen fixation method of electrocatalyst and electrocatalytic electrode, specifically discloses Na 0.26 CoO 2 Electrocatalytic nitrogen fixation electrode, and the Na 0.26 CoO 2 Electrocatalytic Nitrogen Fixation Electrode and Hg / HgSO 4 The electrodes are assembled into an electrocatalytic nitrogen fixation battery, and the application of catalytic conversion of nitrogen in the atmosphere into ammonia in a sulfuric acid solution at a voltage of -0.1 to -1.0V; the patent application number CN201910339033.1 discloses a reduction ionic liquid-based Ferric oxide nitrogen fixation catalyst rich in oxygen vacancies, preparation method and application thereof for electrocatalytic nitrogen fixation, specifically discloses preparation of ferric oxide nanocube particles rich in oxygen vacancies and smaller particles, and applied to electrocatalytic nitrogen fixation reaction However, the methods and catalysts disclosed in the above patents still have very slow kinetics and ultra-low selectivities involving nitrogen reduction reactions under ambient conditions

Therefore, the development of efficient nitrogen reduction catalysts is still the most important challenge for nitrogen fixation at room temperature and pressure.

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