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Preparation of supported nanometer nickel catalyst and application thereof

A catalyst and nano-nickel technology, applied in the field of preparation of new catalysts, can solve problems such as easy spontaneous combustion of framework nickel, environmental pollution, loss of price advantage, etc.

Inactive Publication Date: 2008-03-19
天津市瑞凯科技发展有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of nickel price year by year, the price of skeleton nickel has also increased significantly, and its price advantage is gradually losing
In addition, skeleton nickel has the fatal disadvantage of being prone to spontaneous combustion, which poses a great safety hazard in storage and use
In the preparation process of skeleton nickel, nickel-aluminum alloy needs to be prepared at high temperature at first, which will consume a lot of electric energy, and the subsequent aluminum washing (about 45% of aluminum needs to be eluted) will produce a large amount of waste alkaline water discharge, which will cause environmental pollution. Pollution and serious waste of aluminum resources

Method used

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  • Preparation of supported nanometer nickel catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Using alumina as a carrier, take 20ml of PdCl2 solution with a Pd content of 0.002g / ml, add 5g of alumina carrier, stir and impregnate at room temperature for 4h, filter with suction, and dry at 120°C for 2h. The resulting 0.2% Pd / Al 2 o 3 Put the carrier into the nickel-phosphorus plating solution (preparation conditions: 150ml of water, 9.77g of potassium sodium tartrate, 4.47g of nickel sulfate, 4.52g of sodium hypophosphite, and adjust the Ph value to 12.5 with ammonia water), stir, and the carrier will gradually turn black until there are no bubbles Erupt, stop stirring, the nanometer-Ni / Al that the amount of gained nickel is 15% 2 o 3 -1 Catalyst is washed with water until neutral, washed with alcohol and stored in absolute ethanol.

[0012] The catalyzer that obtains carries out hydrogenation reaction, and condition is as described in reaction process condition below, and corresponding reaction result is shown in Table 1

Embodiment 2

[0014] Using alumina as the carrier, take 20ml of nickel sulfate solution with a Ni content of 0.002g / ml, add 5g of alumina carrier, stir and impregnate at room temperature for 4h, filter with suction, and dry at 120°C for 2h. The resulting 0.2% Ni / Al 2 o 3 The carrier is beaten in 15ml of water, under the condition of stirring, with the concentration of 2mol / 1 KBH 4 Solution reduction (molar ratio KBH 4 : Ni=2:1), the obtained 0.5%Ni-B / Al 2 o 3 Put the precursor into the nickel-phosphorus plating solution, stir, and stop stirring until no bubbles emerge, and the resulting nano-Ni / Al 2 o 3 -2 The catalyst is washed with water to neutrality, and stored in absolute ethanol after alcohol washing. Corresponding reaction condition is with embodiment 1, and the results are shown in Table 1

Embodiment 3

[0016] The preparation conditions are the same as in Example 2, the pH value of the plating solution configured in Example 2 is reduced to 8, and the rest of the conditions are the same as in Example 2. Prepared Nano-Ni / Al 2 o 3 -3 Catalyst. The reaction results are shown in Table 1.

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Abstract

The invention relates to a supported nanometer nickel catalyst, which adopts isopyknic impregnation method and loads active metal components on the carrier, with the active metal content from 0.1 percent to 5 percent. And then the active metal induces the metal nickel in nickel and phosphorus bath to deposit to yield high activity supported nanometer nickel catalyst with 15 percent content of active component nickel. The catalyst used to prepare 2, 5-dichloroaniline from chloronitrophen added with hydrogen yields high hydrogen activity. Especially when UCZHJ is used a reaction promoter, the reaction yield reaches 100 percent, and the catalyst can be used repeatedly.

Description

technical field [0001] The invention belongs to a preparation method of a novel catalyst, in particular a loaded nano-nickel catalyst prepared by an induced powder electroless plating method, and such a catalyst is used for the hydrogenation of 2,5-dichloronitrobenzene to prepare 2,5-dichloro The key technology of aniline reaction. Background technique [0002] 2,5-Dichloroaniline is an important chemical raw material. With the rapid development of advanced dyes in China, as an excellent intermediate for synthetic dyes, it has attracted more and more attention. At present, the main method for producing 2,5-dichloroaniline is to hydrogenate 2,5-dichloronitrobenzene, mainly iron powder method and catalytic hydrogenation method. Among them, the iron powder method is more polluting to equipment and the environment, and the product yield is low; while the catalytic hydrogenation method is environmentally friendly, with high product yield and good product quality. The catalytic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755C07C211/52C07C209/36
Inventor 王广柏王全义张明慧王寰李伟韩翠婷李若愚边俊民陶克毅
Owner 天津市瑞凯科技发展有限公司
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