RuCo alloy catalyst, preparation method thereof and application thereof in ammonia synthesis

Abstract

The invention discloses a RuCo alloy catalyst capable of breaking a restrictive relationship, a preparation method of the RuCo alloy catalyst and an application of the RuCo alloy catalyst to ammonia synthesis. The RuCo alloy catalyst comprises a nitrogen-doped carbon carrier and active metals Ru and Co loaded on the carbon carrier. According to the invention, the highly dispersed RuCo alloy monatomic catalyst is synthesized by a reduction method; according to the catalyst, Ru and Co have a synergistic effect; dissociation of N2 and desorption of NHx are promoted to occur on different active sites; therefore, the restrictive relationship existing in the synthetic ammonia reaction is broken through; the obtained RuCo alloy monatomic catalyst has excellent synthetic ammonia catalytic performance under a mild condition; the ammonia synthesis rate reaches 11.2 mmol NH3/(gcat.h) under the condition of 400 DEG C, the catalyst has extremely high catalytic stability, meanwhile, the preparationmethod of the catalyst is simple, the utilization rate of metal atoms is high, and the catalyst has obvious industrial application value.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials, and in particular relates to a RuCo alloy catalyst, a preparation method thereof and an application for ammonia synthesis. Background technique [0002] Ammonia (NH 3 ) is the main raw material of nitrogen fertilizer, the nitrogen source of almost all important synthetic nitrogen-containing chemicals, and also an important carrier of hydrogen energy. At present, the industrial synthesis of ammonia is mainly through the Haber-Bosch process based on fossil energy, using iron-based catalysts to promote N at high temperature and pressure. 2 and H 2 The reaction produces NH 3 , the energy consumption of this reaction accounts for about 1-2% of the total global energy consumption, and there is a huge problem of energy consumption. The currently reported reaction pathways for alloy catalysts to catalyze the ammonia synthesis reaction are all N 2 first dissociated, then gradually hydrogen...

AI Technical Summary

Problems solved by technology

At present, the industrial synthesis of ammonia is mainly through the Haber-Bosch process based on fossil energy, using iron-based catalysts to promote N at high temperature and pressure. 2 and H 2 The reaction produces NH 3 , the energy consumption of this reaction accounts for about 1-2% of the total global energy consumption, and there is a problem of huge energy consumption

The currently reported reaction pathways for alloy catalysts to catalyze the ammonia synthesis reaction are all N 2 first dissociated, then gradually hydrogenated to NH 3 , this reaction mechanism is due to the fact that the dissociation of the N≡N bond requires a very large amount of energy (946kJ / mol), resulting in the synthesis process still being carried out under high temperature and high pressure conditions

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