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P-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst and preparation method

A technology of p-nitrophenol and nanostructure, which is applied in the field of loaded egg yolk-eggshell nanocatalyst and its preparation, can solve the problems of increasing the production cost of aminophenol, the limitation of aminophenol production, and the expensive price of palladium catalyst, etc., and achieve the synthesis Low cost, good catalytic activity, and uniform particle size distribution

Active Publication Date: 2018-09-04
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The palladium catalyst is expensive, which increases the production cost of p-aminophenol; the nano-nickel catalyst reduces the performance of the catalyst due to agglomeration, which limits the production of p-aminophenol by hydrogenation of p-nitrophenol

Method used

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  • P-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst and preparation method
  • P-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst and preparation method

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Effect test

preparation example Construction

[0043] The method for preparing the above-mentioned supported egg yolk-egg shell nanostructure catalyst for hydrogenation of p-nitrophenol includes the following steps:

[0044] S1. Grind the washed and dried biomass through a screen to make biomass powder; under the protection of inert gas, the biomass powder is carbonized in a tube furnace to obtain a carbonized powder, which is acid-washed to adjust the pH; dried and piped The carrier biomass charcoal is obtained by the second carbonization of the furnace;

[0045] S2. The biomass charcoal and the transition metal salt are added to the dispersant and dispersed to obtain a dispersion;

[0046] S3. Separate the dispersion, wash and dry the precipitate to obtain a precursor powder;

[0047] S4. Under the protection of inert gas, the precursor powder is heated in a tube furnace, chemically calcined and reduced, and then cooled to obtain a supported egg yolk-egg shell nanostructure catalyst for the hydrogenation reaction of p-nitropheno...

Embodiment 1

[0064] A method for preparing a supported egg yolk-egg shell nano-structured catalyst for the hydrogenation reaction of p-nitrophenol includes the following steps:

[0065] S1. Wash the freshly picked holly leaves with deionized water for 3 times, dry them in a blast drying oven at 80°C for 12 hours, then take them out, manually grind them until the leaves are powdered, and sieved through a 100-mesh pharmacopoeia sieve; The tube furnace is heated to 800℃, the heating rate is 10℃ / min, the gas velocity is 40mL / min, and the temperature is maintained for 120min; take 3g of the carbonized holly leaf powder and add it to 80ml of deionized water. After fully stirring on the stirrer, add 2ml of hydrochloric acid and 1ml of nitric acid to it for pickling; set the speed of magnetic stirring to 600r / min, immersion time of 12h; wash with deionized water to PH=7, centrifuge and dry; Under the protection, the tube furnace is heated to 500℃, the heating rate is 10℃ / min, the gas velocity is 40mL...

Embodiment 2

[0075] Except that the sieving pharmacopoeia sieve used in step S1 is 50 meshes, other conditions are the same as in Example 1.

[0076] The obtained supported catalyst has good dispersibility and no agglomeration phenomenon; the average particle size is about 70 nm; all have egg yolk-egg shell structure morphology and uniform distribution.

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Abstract

The invention discloses a p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst and a preparation method thereof. The p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst is prepared from a carrier and an active component, wherein biomass charcoal is used as the carrier; transition metal is used as the active component; transition metal molecules are dispersed and embedded in a porous biomass charcoal carrier, and a yolk-eggshell structure is formed; the particle diameter of the transition metal molecules is 30 to 90 nm; the loaded mass percentage of the active components is 0.5 to 20 percent, and the mass percentage of the carrier is 75 to 99.5 percent; the particle size of the p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst is 30to 90 nm, particles are uniformly dispersed on the surface of the biomass charcoal, and a gathering phenomenon does not appear. The carrier and a precursor which are adopted for preparing the p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst are both low-cost matters, so that the cost of the p-nitrophenol hydrogenated loaded yolk-eggshell nanostructure catalyst can be greatlyreduced; meanwhile, a material has ferromagnetism, separation and collection of products can be carried out by very conveniently using a magnet, and repeated use of the material is facilitated.

Description

Technical field [0001] The invention relates to the field of nano material preparation and nano catalytic material, in particular to a supported egg yolk-egg shell structure nano catalyst for hydrogenation reaction of p-nitrophenol and a preparation method thereof. Background technique [0002] The preparation of nanomaterials with regular morphology and excellent catalytic performance by a simple impregnation method has always been a hot issue in the field of industrial catalysis, especially for the catalytic degradation of environmental pollutants. Taking p-nitrophenol as an example, it is an important organic chemical synthesis raw material, and it has a wide range of applications in fine chemical industries such as explosives, dyes, and pharmaceutical intermediates. P-nitrophenol is toxic and has a strong stimulating effect. It can cause allergies, liver and kidney damage and strong carcinogenic effects when absorbed through the skin. However, due to its wide application, wa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C07C213/02C07C215/76
CPCC07C213/02B01J23/75B01J35/396B01J35/397B01J35/33C07C215/76
Inventor 程道建杨梦洁吴登峰戴长庆李超
Owner BEIJING UNIV OF CHEM TECH
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