Preparation method for para-aminophenol ordered mesoporous carbon catalyst

A p-aminophenol and catalyst technology, which is applied in the field of nano-catalyst material preparation, can solve the problems of complex and lengthy reaction process, poor recycling performance, and stability to be improved, and achieve cheap and easy-to-obtain raw materials, developed specific surface area, and abundant raw materials Effect

Active Publication Date: 2018-01-12
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] 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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  • Preparation method for para-aminophenol ordered mesoporous carbon catalyst
  • Preparation method for para-aminophenol ordered mesoporous carbon catalyst

Examples

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Embodiment 1

[0022] Using chitosan as raw material, weigh 10g of chitosan and put it into a polytetrafluoroethylene-lined reaction kettle with a volume of 100ml to ensure that the solution volume to kettle volume ratio is 5:10, select cobalt oxide as the doping source, and cobalt oxide The mass ratio of surfactant P123 to chitosan is 1:10. After the surfactant P123 is dissolved, the mass ratio of surfactant P123 to chitosan is guaranteed to be 3:20. After the three are mixed evenly, the reaction kettle is placed in a box-type incubator and heated to the target temperature. 190°C, keep the temperature constant for 8 hours, cool down to room temperature, filter to obtain a dark brown solid, and then wash with deionized water and absolute ethanol until the filtrate is colorless, then dry and grind. The cobalt-doped carbon-based catalyst precursor obtained above was put into a tubular calciner, and carbonized at 850 °C for 2 h under the protection of nitrogen atmosphere to obtain a cobalt-doped...

Embodiment 2

[0025] Take chitosan as raw material, take 7g chitosan and put it into a polytetrafluoroethylene-lined reaction kettle with a volume of 100ml, ensure that the solution volume and kettle volume ratio are 7:10, and choose ferric iron tetroxide as a doping source, Its mass ratio with chitosan is 3:20, after the surfactant F127 and P123 are dissolved, ensure that the mass ratio of the mixture to chitosan is 3:20, after the three are mixed evenly, the reaction kettle is put into a box-type incubator, and the temperature rises. To the target temperature of 220°C, keep the temperature for 6 hours, cool down to room temperature, filter to obtain a dark brown solid, and then wash with deionized water and absolute ethanol until the filtrate is colorless, then dry and grind. The iron-doped carbon-based catalyst precursor obtained above was put into a tubular calciner, and carbonized at 950 °C for 1 h under the protection of nitrogen atmosphere to obtain a cobalt-doped carbon catalyst with...

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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

Technical field: [0001] The invention relates to the field of preparation of nano-catalyst materials, in particular to a method for preparing an ordered mesoporous carbon catalyst for preparing p-aminophenol Background technique: [0002] Aminophenol (PAP) is an important fine organic chemical intermediate, commonly used in the preparation of anesthetics, analgesics, antipyretics, and is widely used in the dye industry, preparation of developers, antioxidants and food additives. Generally, three methods are used to prepare 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. But these methods usually take a long time, operate under strict conditions, and involve expensive raw materials. The study also pointed out that various nitrophenol mixtures are the most common organic pollutants in industrial and agricultural wastewater. If various nitrophenols...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745B01J23/75B01J35/08B01J35/10C07C213/02C07C215/76
Inventor 吴琼于世涛刘仕伟解从霞于海龙
Owner QINGDAO UNIV OF SCI & TECH
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