Anti-dehalogenation catalyst for nitro reduction of halogenated aromatic nitro compound as well as preparation method and application of anti-dehalogenation catalyst

Abstract

The invention discloses an anti-dehalogenation catalyst for nitro reduction of a halogenated aromatic nitro compound, the anti-dehalogenation catalyst comprises a carrier, the carrier is an activated carbon carrier, the anti-dehalogenation catalyst also comprises an active component A and an auxiliary component B which are loaded on the carrier, and the active component A is Pd, Pt or Ru; the auxiliary component B is an oxide of a metal element X, and the metal element X is an alkali metal or any one of Ba, Sr, Ga, Mg, La, Ce, Zn and Sn; the alkali metal is any one of Cs, Rb, K, Li and Fr; and the catalyst comprises the following components in percentage by mass: 0.2-1.0% of the active component A, 0.1-0.5% of the auxiliary component B and the balance of the carrier. Meanwhile, the invention also discloses a preparation method and application of the catalyst. The catalyst is high in activity, the raw material conversion rate is greater than 99%, the product selectivity is greater than 99%, and the dehalogenation rate is less than 0.1%.

Description

technical field [0001] The invention belongs to the technical field of chemical chemical synthesis, and in particular relates to an anti-dehalogenation catalyst for reducing the nitro group of a halogenated aromatic nitro compound and a preparation method and application thereof. Background technique [0002] Aromatic amines and halogenated arylamines are basic chemical raw materials and organic intermediates. They are widely used in the fields of medicine, pesticides, dyes and daily chemicals, and are in great market demand. The production method is mainly obtained by reducing the corresponding aromatic nitro compounds, and the reduction methods include iron powder reduction method, alkali sulfide reduction method, electrolytic reduction method and catalytic hydrogenation reduction method. The reduction of halogen-containing aromatic nitro compounds to prepare halogen-containing aromatic amines is an important organic synthesis unit reaction. [0003] At present, catalytic...

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the poor control of the hydrodehalogenation rate of halogenated aromatic nitro compounds in the prior art, the low selectivity, and the cumbersome operation of the kettle process, Many wastes, small output, high power consumption, difficult to separate, etc.