Preparation method and application of composite nano nickel catalyst

A nano-nickel and composite technology, which is applied in the field of preparing composite nano-nickel catalysts, can solve the problems of low price, environmental pollution, waste alkali water pollution, etc.

Inactive Publication Date: 2010-09-15
TIANJIN ANKAITE CATALYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Its traditional production process mainly adopts iron powder reduction method, but this method produces a large amount of iron sludge, which causes serious pollution to the environment
Although the Raney Ni catalyst has great advantages such as high activity, good sedimentation separation and low price for this reaction, the Raney Ni catalyst itself also has many serious disadvantages.
For example, the intermediate

Method used

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  • Preparation method and application of composite nano nickel catalyst
  • Preparation method and application of composite nano nickel catalyst
  • Preparation method and application of composite nano nickel catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] These examples illustrate that composite nano-nickel catalysts with different compositions are prepared by adjusting the ratio of amorphous and crystalline Ni with silica sol as a carrier.

[0020] The first is the preparation of silica sol supported amorphous Ni. Prepare a certain concentration of KBH 4 The solution has a concentration of 0.1 to 2.0 mol / L, and is uniformly mixed with a certain amount of silica sol. Then prepare a certain concentration of nickel salt solution, the concentration is 0.02 ~ 2.83mol / L, nickel salt and KBH 4 The molar ratio is 1:2. Under a certain protective gas, drop the nickel salt solution into the above mixed solution at a certain speed (1-12mL / min), control the reaction temperature at 0-30°C, and react until no gas is generated. The product is amorphous Ni supported by silica sol, and it is used as the precursor of reducing crystalline nano-nickel. Then, prepare a certain concentration of nano-nickel plating solution, its specific c...

Embodiment 2

[0022] These examples illustrate the process of using silica sols with different particle sizes as carriers to prepare composite nano-nickel catalysts.

[0023] Alkaline silica sols (20nm, 60nm, 80nm, 110nm, 130nm) of different particle sizes were used as carriers respectively, and the composite nano-nickel catalyst supported by silica sol was prepared according to the method in Example 1.

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Abstract

The invention discloses a preparation method of a composite nano nickel catalyst. The preparation method comprises the steps of: preparing amorphous-state nickel with small nanoscale and highly dispersed active components by using a chemical reduction method in the presence of ludox as soft load material; reducing and depositing crystalline-state nano nickel on a carrier by using the amorphous-state nickel as an inductive agent; and adjusting the proportion of amorphous-state nickel and crystalline-state nickel to prepare the ludox loaded composite nano nickel catalyst. Compared with an industrial Raney Ni catalyst and single amorphous-state nickel or crystalline-state nickel, the composite catalyst shows excellent catalysis performance in hydrogenation reaction of 4-chloro-2-nitrophenol for preparing 4-chloro-2-amino phenol.

Description

technical field [0001] The invention relates to a new method for preparing composite nano-nickel catalyst. Using silica sol as the loading material, the composite nano-nickel catalyst in amorphous and crystalline states was prepared by combining the chemical reduction method and the electroless plating method. The catalyst exhibits excellent catalytic performance in the hydrogenation reaction of 4-chloro-2-nitrophenol to 4-chloro-2-aminophenol. Background technique [0002] 4-Chloro-2-aminophenol is an important intermediate in the production of dyes, mainly used in the preparation of acid medium RH, acid complex violet 5RN and reactive dyes, and can also be used in the preparation of raw material chlorzoxazone. Its traditional production process mainly adopts iron powder reduction method, but this method produces a large amount of iron sludge, which causes serious pollution to the environment. Although the Raney Ni catalyst has great advantages such as high activity, good...

Claims

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Application Information

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IPC IPC(8): B01J23/755B01J37/04C07C215/76C07C213/00
Inventor 王广柏闫洪李若愚高志国陶克毅
Owner TIANJIN ANKAITE CATALYST
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