Nickel-oxide composite catalyst for high-selectivity preparation of iodo-arylamine from iodo-aromatic nitro compound and application of nickel-oxide composite catalyst

Abstract

The invention provides a nickel-oxide composite catalyst for high-selectivity preparation of iodo-arylamine from an iodo-aromatic nitro compound and application of the nickel-oxide composite catalyst, the nickel-oxide composite catalyst Ni-MOx (M = Ce, V)/SiO2 comprises a carrier and an active component, and is of a multi-core core-shell structure. The active component nickel-oxide is highly dispersed on the surface and inside the silicon dioxide ball, and the content is 1-5wt%. The composite material is used as a heterogeneous non-noble metal catalyst and is applied to catalyzing the hydrogenation of an iodo-aromatic nitro compound to prepare iodo-arylamine. The nickel-oxide composite catalyst provided by the invention has high catalytic activity in the process of catalyzing the reduction of an iodo-aromatic nitro compound to prepare iodo-arylamine, the conversion rate of catalyzing the hydrogenation of iodo-nitrobenzene is greater than 90%, and the selectivity is greater than 90%; the preparation process is simple, the conditions are mild, and the used raw materials are cheap and easily available. The synthesized catalyst has high stability and can be stored in the environment for a long time.

Description

technical field [0001] The invention belongs to the field of nano-catalysis, relates to a nickel-oxide composite material used for catalyzing the hydrogenation of iodoarylnitro compounds to produce iodoarylamines, and in particular relates to a method for producing iodoarylamines with high selectivity from iodoarylnitro compounds Nickel-oxide composite catalysts for amines and their applications. Background technique [0002] Halogenated arylamine compounds are widely used in material chemistry, organic chemistry, medicinal chemistry and other fields, and are important intermediates for the synthesis of dyes, pesticides and herbicides and other chemicals. Most of the halogenated arylamines are obtained by the reduction of the corresponding halogenated arylnitro compounds. At present, industrial reduction methods include alkali sulfide reduction method, iron powder reduction method, hydrogen transfer reduction method, electrolytic reduction method, and catalytic hydrogenatio...

AI Technical Summary

Problems solved by technology

Noble metal catalysts have high catalytic activity, but are difficult to be widely used in industrialization due to their high price; non-noble metal catalysts require harsh reaction conditions and their activity needs to be improved

And whether it is a noble metal catalyst or a non-noble metal catalyst, there is a common problem of easy dehalogenation in the catalytic hydrogenation process of halogenated aromatic nitro compounds, which reduces the yield of the product, and the generated hydrohalic acid will corrode the equipment, especially the iodine Substituted aryl nitro compounds are easier to dehalogenate in the reaction, so most of the research uses fluorine, chlorine, and bromine substituted nitro compounds as reaction substrates. At present, there are no related patents related to the catalytic hydrogenation of iodo aryl nitro compounds , and the only studies in the literature are limited to Pd, Pt and other noble metal-based catalysts, such as Pd (Chem Asian J, 2019, 14(3): 407), which uses NaBH 4 As a reducing agent to catalyze the reduction of p-nitroiodobenzene for 10 hours, the yield of p-iodoaniline is only 50%, and there is an obvious side reaction of dehalogenation

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