Method for preparing halogenated nitrobenzene selective hydrogenation high-activity nano-ruthenium catalyst

Abstract

The invention discloses a method for preparing a halogenated nitrobenzene selective hydrogenation high-activity nano-ruthenium catalyst, which comprises the following steps: evenly mixing surfactant aqueous solution with pre-dissolved ruthenium salt solution; adding a reducer to deoxidize the mixture so as to form surfactant stable nano-ruthenium colloidal solution; adding a carrier to the ruthenium colloidal solution for adsorption, and filtering the mixture after the adsorption; and washing the catalyst until the filtrate is neutral to obtain the highly-dispersed supported nano-ruthenium catalyst. The method has the advantages of simplicity, low cost, good repeatability and environmental protection, and the prepared catalyst has high dispersion degree and long service life.

Description

Technical field:

[0001] The present invention relates to a catalyst. Background technique:

[0002] Halogenated anilines are an important class of organic intermediates, widely used in the synthesis of fine chemical products such as dyes, medicines, pesticides, and spices. In industry, chloroanilines are generally prepared by reducing chloronitrobenzenes. At present, the methods for reducing halonitrobenzene compounds to chloroarylamine compounds mainly include the following methods: chemical reduction method, electrolytic reduction method, carbon monoxide Reduction method, catalytic hydrogenation reduction method. The chemical reduction method, such as using iron powder, alkali sulfide, hydrazine hydrate, borohydride, etc. to organize production, has a long process flow, many wastes, and great environmental pollution. Due to the consideration of electrode materials, electrolysis equipment, cost and other aspects, the electrolytic reduction method has not been reported on ...