A kind of preparation method of ordered mesoporous carbon catalyst for preparing p-aminophenol

Abstract

The invention discloses a preparation method for a para-aminophenol ordered mesoporous carbon catalyst. The preparation method is characterized in that chitosan is taken as a raw material, and non-precious metal compounds are used as a doping source, meanwhile, a triblock copolymer surfactant is added, after performing self-produced high pressure treatment under a high temperature hydrothermal condition, filtering is performed so as to obtain a dark brown solid product, the solid product is dried, ground, and then put into a tubular calcinator, and high temperature carbonization under inert gas atmosphere protection is performed, so as to obtain a high-stable metal-doped carbon-based catalyst with different ordered mesoporous structures. The catalytic efficiency of the high-stable metal-doped carbon-based catalyst for para-nitrophenol hydrogenation catalysis generating para-aminophenol is investigated. The operation process has the main characteristics that the biomass resource chitosan is used as a raw material and is environmentally friendly, cheap and available; the surfactant is added, so that the formation of the ordered mesoporous structure is effectively controlled, the effective contact area between the reactant and the catalyst is increased, and the reaction conditions are mild; an active center and a carbon material are generated simultaneously, so that the structureis more stable, and the reaction process operationis simple.

Description

[0001] Technical Field: [0002] The invention relates to the field of preparation of nano-catalyst materials, in particular to a preparation method of an ordered mesoporous carbon catalyst for preparing p-aminophenol Background technique: [0003] Aminophenol (PAP) is an important fine organic chemical intermediate. It is commonly used in the preparation of anesthetics, analgesics, and antipyretics. It is also widely used in the dye industry, the preparation of imaging agents, antioxidants and food additives. Generally, there are three main methods for preparing PAP: p-nitrophenol (PNP) is prepared by multi-step iron-acid reduction; nitrobenzene is prepared by catalytic hydrogenation in a strong acid system and electrochemical reduction method. However, these methods usually take a long time, the operating conditions are strict, and the raw materials involved are also very expensive. The study also pointed out that various nitrophenol mixtures are the most common organic pollutan...

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Problems solved by technology

[0009] In summary, the currently widely used method for preparing the catalyst for p-aminophenol is mainly to directly load the active component on the carrier. The carrier can be a carbon material or silicon dioxide. Most of the active components are noble metals, ions, etc. One or the mixture in the liquid has high catalytic activity, but the simple load makes its stability need to be improved, and the recycling performance is poor. At the same time, some reaction processes are complicated and lengthy, which increases the reaction process.

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