Ruco alloy catalyst and its preparation method and application for ammonia synthesis

Abstract

The invention discloses a RuCo alloy catalyst which breaks the restrictive relationship, its preparation method and its application for ammonia synthesis. The RuCo alloy catalyst comprises a nitrogen-doped carbon carrier and active metals Ru and Co supported on the carbon carrier. The present invention synthesizes a highly dispersed RuCo alloy single-atom catalyst through a reduction method, and the catalyst promotes N through the synergistic effect of Ru and Co 2 The dissociation of NHx and the desorption of NHx occur on different active sites, which breaks the restrictive relationship existing in the ammonia synthesis reaction. The obtained RuCo alloy single-atom catalyst has excellent catalytic performance for ammonia synthesis under mild conditions. Ammonia synthesis rate reached 11.2mmol under the condition NH3 / (g cat h), and has extremely high catalytic stability, and at the same time, the preparation method of the catalyst is simple, the utilization rate of metal atoms is high, and it has obvious industrial application value.

Description

Technical field [0001] The present invention belongs to the technical field of catalyst materials, and in particular, there is a Ruco alloy catalyst and a preparation method thereof and an application for ammonia synthesis. Background technique [0002] Ammonia (NH 3 Is the main raw material of nitrogen fertilizer, and almost all important artificial synthetic nitrogen sources of nitrogen chemicals, and is also an important carrier of hydrogen energy. At present, industrialized synthetic ammonia mainly promotes N of iron-based catalyst under high temperature and high pressure based on Haber-Bosch based on fossil energy. 2 Hidden 2 Reaction to generate NH 3 The reaction energy consumption accounts for about 1-2% of the world's total energy consumption, and there is a huge energy consumption. The reactive path of the currently reported alloy catalyst catalyzed ammonia reaction is n 2 First dissociate, then gradually hydrogen production of NH 3 This reaction mechanism is a very larg...

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

Images