A nano-iron-modified iron-based ammonia synthesis catalyst prepared by solid-state reaction at room temperature and its preparation method and application

Abstract

The invention discloses a nano-iron-modified iron-based ammonia synthesis catalyst prepared by solid-phase reaction at room temperature, and a preparation method and application thereof. The method comprises the following steps: uniformly mixing an iron-based ammonia synthesis catalyst, an iron precursor and a solid reagent, and carrying out grinding, ball milling or stirring so that the iron precursor reacts with the solid reagent on the iron-based ammonia synthesis catalyst support; and after the reaction finishes, filtering the product, washing, drying, and carrying out heat treatment in air, nitrogen, argon or vacuum to obtain the final nano-iron-modified iron-based ammonia synthesis catalyst, wherein the nano iron supporting capacity is 0.1-20 wt%. The preparation method is simple, and has the advantages of accessible and cheap raw materials, short preparation cycle and low energy consumption. The prepared nano iron iron-based ammonia synthesis catalyst has the advantages of small particle size, higher stability, higher activity and the like.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a nano-iron-modified iron-based ammonia synthesis catalyst prepared by solid-phase reaction at room temperature, a preparation method and application thereof. Background technique [0002] For ammonia synthesis catalysts, its research has a history of 100 years, and the continuous improvement of catalysts has always been one of the key ways for the ammonia synthesis industry to reduce energy consumption and improve efficiency. [0003] In 1986, the patent CN1091997A disclosed a Fe 1-x O (wustite) as the parent catalyst of the new system. Fe 1-x O ammonia synthesis catalyst has high activity at low temperature, easy reduction, high mechanical strength and suitable for H 2 / N 2 With the characteristics of wide range and service life (up to 10 years), it is the most active and most advanced new generation molten iron catalyst in the world. In 1992, the British BP ...

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Problems solved by technology

In 1984, FeCp was prepared by the Catalysis Laboratory of Zhejiang University of Technology 2 -AC-K catalyst also has high activity, but the stability of the catalyst is not good [Journal of Zhejiang Institute of Technology. 1984.9-13]

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