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Egg yolk-eggshell nano-structured catalyst for hydrogenation of p-nitrophenol and its preparation method

A technology of p-nitrophenol and nanostructures is applied in the field of supported egg yolk-eggshell structure nanocatalysts and the preparation thereof, which can solve the problems of increasing the production cost of aminophenol, the expensive palladium catalyst, and the production limitation of aminophenol, and achieves the synthesis of Low cost, good catalytic activity, cost reduction effect

Active Publication Date: 2020-09-04
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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  • Egg yolk-eggshell nano-structured catalyst for hydrogenation of p-nitrophenol and its preparation method
  • Egg yolk-eggshell nano-structured catalyst for hydrogenation of p-nitrophenol and its preparation method
  • Egg yolk-eggshell nano-structured catalyst for hydrogenation of p-nitrophenol and its preparation method

Examples

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preparation example Construction

[0043] The above-mentioned preparation method of a loaded egg yolk-eggshell nanostructure catalyst for hydrogenation of p-nitrophenol comprises the following steps:

[0044] S1. Grind the cleaned and dried biomass through a sieve to make biomass powder; under the protection of inert gas, carbonize the biomass powder in a tube furnace to obtain a carbonized powder, adjust the pH after pickling; Type furnace secondary carbonization to obtain carrier biomass charcoal;

[0045] S2, adding the biochar and the transition metal salt to the dispersant to disperse to obtain a dispersion;

[0046] S3. Separating the dispersion, washing and drying the precipitate to obtain a precursor powder;

[0047] S4. Under the protection of an inert gas, the precursor powder is heated in a tube furnace, subjected to chemical calcination and reduction treatment, and then cooled to obtain a supported egg yolk-eggshell nanostructure catalyst for p-nitrophenol hydrogenation reaction.

[0048] Accordin...

Embodiment 1

[0064] A preparation method for a loaded egg yolk-eggshell nanostructure catalyst for hydrogenation of p-nitrophenol, comprising the steps of:

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

Embodiment 2

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

[0076] The obtained supported catalyst has good dispersibility and no agglomeration phenomenon; the average particle diameter is about 70nm; both are egg yolk-eggshell structure morphology, and the distribution is uniform.

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Abstract

The invention discloses a supported yolk-eggshell structure nanocatalyst for hydrogenation reaction of p-nitrophenol and a preparation method thereof; the catalyst includes a carrier and an active component, the carrier is biomass carbon, and the active component Divided into transition metals; the transition metal molecules are dispersed and embedded in the porous biomass carbon carrier, showing a yolk-eggshell structure. The particle size of the transition metal molecules is 30-90 nanometers, and the active component loading mass percentage is 0.5- 25%, and the carrier mass percentage is 75%-99.5%. The catalyst particle size is 30-90 nanometers, and the particles are evenly dispersed on the surface of the biomass carbon without aggregation. The carriers and precursors used in catalyst preparation are low-priced substances, which can greatly reduce the cost of the catalyst. At the same time, because the material is ferromagnetic, it is very convenient to use magnets to separate and collect products, which is conducive to the reuse of materials.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation and nanocatalytic materials, in particular to a loaded egg yolk-eggshell structure nanocatalyst for p-nitrophenol hydrogenation reaction and a preparation method thereof. Background technique [0002] The simple impregnation method to prepare nanomaterials with regular morphology and excellent catalytic performance has always been a hot issue in the field of industrial catalysis, especially in the catalytic degradation of environmental pollutants. Taking p-nitrophenol as an example, it is an important raw material for organic chemical synthesis, and it is widely used in fine chemical industries such as explosives, dyes, and pharmaceutical intermediates. P-nitrophenol is toxic and has a strong stimulating effect. Absorption through the skin can cause allergies, liver and kidney damage, and has a strong carcinogenic effect. However, due to its wide application, wastewater containing p-nitrop...

Claims

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Application Information

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Patent Type & Authority Patents(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