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Catalyst for p-nitrophenol hydrogenation to prepare p-aminophenol and preparation thereof

A catalyst, new method technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, preparation of amino hydroxy compounds, etc., can solve the limitation of production capacity and catalyst life, low reaction selectivity, easy living, etc.

Inactive Publication Date: 2008-09-10
NANKAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In today's industrial production, the hydrogenation of nitro compounds mostly uses skeleton nickel as a catalyst. The main defect is that the reaction selectivity is low, and it is easy to activate, which limits the production capacity and the life of the catalyst.

Method used

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  • Catalyst for p-nitrophenol hydrogenation to prepare p-aminophenol and preparation thereof
  • Catalyst for p-nitrophenol hydrogenation to prepare p-aminophenol and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The hydrogenation reaction of skeleton nickel was carried out in a 100ml autoclave. After mixing 8g of p-nitrophenol, 40ml of ethanol and 20ml of deionized water, add 0.4g of catalyst, the hydrogen pressure is 1.5MPa, the reaction temperature is 100°C, and the rotation speed is 800r / min.

Embodiment 2～16

[0020] In 100ml of aqueous solution, dissolve 1.5g of nickel acetate and 1.88g of hydrazine hydrate in turn, so that the molar ratio of hydrazine hydrate to nickel ions [N 2 h 4 ] / [Ni 2+ ]=5, then add 0.4g sodium hydroxide to adjust the pH value of the solution to obtain a stable plating solution. After the above plating solution was placed in a water bath at 80 °C, 2 g of TiO with a loading of 1% NiB 2 The carrier (refer to CN1546229A for the preparation process) is added into the plating solution, and the reaction stops after 10 minutes. Gained black product Catalyst A is washed to neutrality, and is stored in water for subsequent use.

[0021] Same as the preparation process of catalyst A, the molar ratio of hydrazine hydrate to nickel ion [N 2 h 4 ] / [Ni 2+ ] were changed to 1.0, 2.5, 10 respectively to obtain catalysts B~D.

[0022] Same as the preparation process of catalyst A, the addition of sodium hydroxide was changed to 0.2g, 0.3g, 0.5g, 0.6g respectively to o...

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Abstract

The invention relates to a novel method for preparing loading type nanometer nickel catalyst; the method takes a carrier loaded with a revulsant as a precursor to induce hydrazine hydrate to reduce a nickel salt solution; the crystal grains of the formed nanometer nickel is directionally deposited on the surface of the carrier with no aggregation; the loading type nanometer nickel catalyst prepared by the method has the advantages of high loading of activating components, small grain diameters, good dispersibility and high activity as well as being suitable for catalytic hydrogenation reaction.

Description

technical field [0001] The invention relates to a catalyst for preparing p-aminophenol by hydrogenation of p-nitrophenol and a preparation method thereof, more specifically a new method for preparing a loaded nano-nickel catalyst, which belongs to the catalyst preparation technology. Background technique [0002] As a kind of metal nanoparticles, nano-nickel has great volume effect and surface effect, which makes it show many special properties in terms of magnetism, thermal resistance, light absorption, chemical activity, etc. As a new type of material, it is more and more popular among people. Pay attention to. At present, the preparation methods of nano-nickel powder mainly include: nickel carbonyl thermal decomposition method, plasma method, electrolysis method, mechanical ball milling method, hydrothermal method and chemical reduction method. Considering the cost and process controllability, the chemical reduction method is the most suitable way to prepare nano-nickel ...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J35/02C07C213/02C07C215/76
Inventor 张明慧李伟陈娟陶克毅
Owner NANKAI UNIV
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