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Preparation and application of nano-nickel/silver/copper (Ni/Ag/Cu) composite catalyst

A composite catalyst and nano-nickel technology, which is applied in the preparation of organic compounds, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of by-product generation and reduction of the purity of main products, etc. , to avoid the generation of by-products, avoid high temperature and high pressure reactions, and increase the value of profits

Inactive Publication Date: 2014-03-19
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, commercial Raney-Ni not only catalyzes the hydrogenation of nitro groups to amino groups, but also catalyzes the hydrogenation of benzene rings, resulting in the generation of by-products and reducing the purity of the main product

Method used

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  • Preparation and application of nano-nickel/silver/copper (Ni/Ag/Cu) composite catalyst
  • Preparation and application of nano-nickel/silver/copper (Ni/Ag/Cu) composite catalyst
  • Preparation and application of nano-nickel/silver/copper (Ni/Ag/Cu) composite catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0031] 1. Catalyst preparation:

[0032] In the presence of organic modifier dihydrate bis(p-sulfonylphenyl)phenyl phosphine dipotassium salt, using copper nitrate, silver nitrate, nickel oxalate, hydrazine hydrate, absolute ethanol, etc. as raw materials, through wet Nano-nickel / silver / copper composite catalysts were prepared by combining chemical reduction method and template method. In the first step, at room temperature, 0.1 g of organic modifier was dissolved in 20 mL of absolute ethanol solution and 20 mL of poly(styrene / methacrylic acid) solution were mixed with each other. Under magnetic stirring, 20 mL of copper nitrate (0.05 mol / L) ethanol solution was added dropwise to the above mixture, and stirred for 1 h. 20 mL of hydrazine hydrate aqueous solution (0.05 mol / L) was added dropwise to the above mixture, and reacted at 40 °C for 10 h. In the second step, 20 mL of silver nitrate (0.05 mol / L) was added dropwise to the above mixed solution, and after magnetic stirrin...

Embodiment 2

[0038] Same as in Example 1, only changing the amount of catalyst: 0.01, 0.02, 0.06, 0.1g, to carry out the selective hydrogenation reaction of p-nitrophenol. The product selectivity and raw material conversion rate obtained are shown in Table 1.

[0039] Table 1. At 0.8MP H 2 The reaction temperature is 120 ℃, the reaction is 8h under heat preservation, and the nano-nickel / silver / copper composite catalyst selectively catalyzes the selectivity of p-aminophenol hydrogenation reaction product of p-nitrophenol and the conversion rate of raw materials when the amount of catalyst is different

[0040]

Embodiment 3

[0042] The same as in Example 1, only changing the temperature of the reactor to 80°C, 100°C, 120°C, 140°C, and 160°C to carry out the selective hydrogenation reaction of p-nitrophenol, the results obtained are shown in Table 2.

[0043] Table 2. At 0.8MP H 2 When the amount of catalyst is 0.08 g, at different reaction temperatures, under heat preservation for 8 hours, the nano-nickel / silver / copper composite catalyst selectively catalyzes the selectivity of p-aminophenol hydrogenation reaction product of p-nitrophenol and the conversion rate of raw materials

[0044]

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PUM

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Abstract

The invention relates to the preparation and application of a nano-nickel / silver / copper (Ni / Ag / Cu) composite catalyst and belongs to the field of nano-catalyst preparation and catalytic research. The preparation comprises the following steps: preparing a hollow Ni / Ag / Cu composite nano-catalyst by using copper nitrate, silver nitrate and nickel nitrate as raw materials; performing reaction through the catalyst by using p-nitrophenol and absolute ethyl alcohol as the raw materials to raise the reaction temperature to 80-160 DEG C, maintaining the temperature, and reacting for 2-8h to obtain high-purity p-aminophenol. The hollow Ni / Ag / Cu composite nano-catalyst is in a spherical particle shape, is small in dosage and is high in catalytic activity and stability. A method for preparing the p-aminophenol through the nano-Ni / Ag / Cu composite catalyst is simple in process requirement and meets an industrialization requirement.

Description

technical field [0001] The invention relates to the preparation and application of a nano-nickel / silver / copper composite catalyst, which belongs to the field of nano-catalysis. Background technique [0002] In recent years, nanoscience and nanotechnology have attracted widespread attention in many fields such as catalysis, medicine, communication, biology, and environmental protection, and have become one of the most active fields of research and development in the world. Due to the small size of nanoparticles, the volume percentage of the surface is large, the bonding state and electronic state of the surface are different from those inside the particles, and the incomplete coordination of surface atoms leads to an increase in the active sites on the surface, which makes it a basic condition for being a catalyst. . It has been reported that nano-metal particles, such as palladium, platinum, rhodium, ruthenium, gold, and nickel, exhibit higher catalytic activity in catalyt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J35/08B82Y40/00C07C215/76C07C213/02
Inventor 王爱丽殷恒波冯永海沈灵沁季玉琴
Owner JIANGSU UNIV
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