Supported catalyst for hydrogenation of aromatic nitro compound and preparation method thereof

Abstract

The invention discloses a supported catalyst for hydrogenation of an aromatic nitro compound and a preparation method thereof, the supported catalyst for hydrogenation of the aromatic nitro compound comprises a carrier, and a main active component, an auxiliary active component and an auxiliary component which are supported on the carrier, the mass percentage of the main active component in the catalyst is greater than or equal to that of the auxiliary active component; the main active component comprises Pd or Pt, the auxiliary active component comprises Au, Pt, Co, Pd, Ru or Ir, and the auxiliary component comprises one or two of Ce, Zn, Mo, Fe, V and Ag; when the main active component is Pd, the auxiliary active component is Au, Pt or Co, and when the main active component is Pt, the auxiliary active component is Pd, Ru or Ir. The catalyst can ensure the hydrogenation reaction activity on the basis of effectively reducing the content of precious metals, and has good initial activity, target product selectivity and service life in a process for producing aromatic amine by hydrogenation of an aromatic nitro compound.

Description

technical field [0001] The invention belongs to the technical field of catalytic reactions, in particular to a supported catalyst for hydrogenation of aromatic nitro compounds and a preparation method thereof. Background technique [0002] Aromatic amine compounds are important intermediates for fine chemicals and specialty chemicals, and are also key raw materials in the field of basic chemicals. For example, aniline and toluenediamine are widely used in the polyurethane industry and can be used in the production of diphenylmethane diisocyanate (MDI) and toluene diisocyanate (TDI), respectively. At present, aniline and toluenediamine are mainly prepared by the catalytic hydrogenation of the corresponding aromatic nitro compounds, in which the catalyst is an important component affecting the hydrogenation process, and the research on the catalyst is endless. [0003] For example, patent application document CN101259414A discloses a supported nickel nanocrystalline catalyst ...

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Problems solved by technology

[0003] For example, the patent application document CN101259414A discloses a supported nickel nanocrystalline catalyst prepared by inductively reducing a nickel-containing solution with a carrier loaded with an inducer as a precursor. Its activity can meet the requirements of hydrogenation of nitrobenzene, but there is The hydrogen slurry bed reactor has the defects of poor dispersion, insufficient life and limited production capacity

In the patent application document US2823235, a kind of activated carbon with low specific surface area and high oil absorption is proposed as the carrier, and Pd, Pt or Pd-Pt bimetallic is used as the active component of nitro hydrogenation, but the preparation method is complex and the precious metal Higher content, higher cost for downstream application companies

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