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Multiphase nanocomposite material and its preparation method, nitro group reduction catalyst, application

A nanocomposite material, cobalt nitrate hexahydrate technology, applied in the field of materials, to achieve the effects of strong controllability, simple and green process, and good reduction catalytic performance

Active Publication Date: 2021-09-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the embodiment of the present invention is to provide a multi-phase nanocomposite material to solve the existing nanocatalysts used for nitro reduction reaction proposed in the above background technology, on the basis of reducing costs, and avoid irreversible problems caused by aggregation or leaching inactivation problem

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  • Multiphase nanocomposite material and its preparation method, nitro group reduction catalyst, application
  • Multiphase nanocomposite material and its preparation method, nitro group reduction catalyst, application
  • Multiphase nanocomposite material and its preparation method, nitro group reduction catalyst, application

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preparation example Construction

[0034] The embodiment of the present invention also provides a method for preparing a multiphase nanocomposite material. The method for preparing a multiphase nanocomposite material includes the following steps:

[0035] Weigh cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium chloride and dissolve them in deionized water and mix them evenly, then add ammonia water to adjust the pH value to 6-7, continue stirring for at least 30 minutes, then add the amorphous Continue to stir and mix the alumina powder for not less than 3 hours, then transfer the stirred and mixed mixture to a sealed environment, heat at 70-80°C for 30-40 hours, cool down naturally, wash, dry, and then protect Calcination at 450-550°C under gas purging, the heating rate of the calcination is 4-6°C per minute, the calcination time is not less than 5 hours, and the multi-phase nanocomposite material is obtained after natural cooling, that is, cobalt-nickel alloy and Amorphous alumina composite....

Embodiment 1

[0050] A kind of amorphous alumina powder, its preparation method is as follows:

[0051] Step 1: Weigh 4.66 g of aluminum sulfate octadecahydrate, 1.68 g of urea, and 0.4 g of sodium tartrate in 70 ml of deionized water, stir for at least 1 hour, transfer to a stainless steel reaction kettle, and heat in an oven at 165°C for 2 hours , after natural cooling, the obtained product was washed with deionized water and absolute ethanol, and centrifuged and dried to obtain a solid powder.

[0052] Step 2: Heat the solid powder obtained in Step 1 in a muffle furnace at a heating rate of 5°C per minute, a calcination temperature of 500°C, and a calcination time of 5 hours. Amorphous alumina powder (appearance is amorphous alumina microspheres), and its X-ray diffraction pattern is as follows figure 1 shown. allowable figure 1 The diffraction peaks of amorphous alumina are seen in the figure, which proves that the preparation is amorphous alumina.

Embodiment 2

[0054] Using the amorphous alumina powder prepared in Example 1 to prepare a composite of cobalt-nickel-aluminum hydrotalcite and amorphous alumina as a precursor, the specific steps are as follows:

[0055] Weigh 1.16 grams of cobalt nitrate hexahydrate, 1.16 grams of nickel nitrate hexahydrate and 2.57 grams of ammonium chloride are dissolved in 80 milliliters of deionized water, stir until completely dissolved, then adjust the pH to 6.5 with a 3wt% ammonia solution, and continue stirring After at least 30 minutes, add 0.3 g of the amorphous alumina powder prepared in Example 1, continue stirring for no less than 3 hours, transfer the mixture to a stainless steel reaction kettle, heat in an oven at 75°C for 36 hours, and cool down naturally , the resulting product was washed with deionized water and absolute ethanol, and dried by centrifugation to obtain a composite of cobalt-nickel-aluminum hydrotalcite and amorphous alumina as a precursor, denoted as Co 0.5 Ni 0.5 -Al-LDH...

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Abstract

The invention relates to the field of material technology, and specifically discloses a multiphase nanocomposite material, a preparation method thereof, a nitro reduction catalyst, and applications. The multiphase nanocomposite material exhibits good catalytic performance for p-nitrophenol reduction. Amorphous alumina powder, cobalt nitrate hexahydrate, nickel nitrate hexahydrate and ammonium chloride are used as raw materials, and a simple method is used to realize the preparation of multi-phase nanocomposites. The whole process is simple and green, with strong controllability, suitable for large-scale Industrial production, while the cobalt-nickel alloy nanoparticles in the heterogeneous nanocomposite materials are highly dispersed on the amorphous alumina nanosheets to avoid their polymerization or deactivation during the catalytic process, and realize the existing nanocatalysts for nitro reduction reaction in On the basis of reducing costs, avoid the problem of irreversible inactivation caused by aggregation or leaching. However, the preparation method of the multiphase nanocomposite material provided is simple, and has important application prospects in the field of chemical production.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a multiphase nanocomposite material, a preparation method thereof, a nitro group reduction catalyst, and applications. Background technique [0002] Catalytic reactions on active metal surfaces are considered to be one of the important pathways for the production of high-value chemicals through feedstock conversion. Exploring high-performance nanomaterials with stable structures has always been a research hotspot in the field of catalysis, which is of great significance and is in line with the development prospects of green chemistry. Amines are important industrial raw materials for medicine, pesticides, dyes, etc. The reduction of p-nitrophenol to amines is a very valuable chemical reaction. Therefore, the construction of highly efficient and good catalytic performance nitro reduction catalyst can reduce the cost of chemical production and serve the people's livelihood. [...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J35/00C07C213/02C07C215/76
CPCB01J23/755C07C213/02B01J35/394B01J35/393C07C215/76
Inventor 李莉萍魏艳华李广社
Owner JILIN UNIV
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