A method for in-situ preparation of highly dispersed metal catalysts by growing two-dimensional nanosheets

A two-dimensional nanotechnology for preparing metals, which is applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. issues such as being effectively protected, achieving the effects of low cost, small scale, and efficient and easy methods

Active Publication Date: 2021-11-19
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this type of method does not introduce too many pollutants, because the metal is not effectively protected, even if the load is controlled to a small amount such as 5%, the metal is easy to agglomerate on the surface of the carrier during the heat treatment to form a large, dispersed Particle distribution that is difficult to control, which becomes more serious as the metal loading increases

Method used

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  • A method for in-situ preparation of highly dispersed metal catalysts by growing two-dimensional nanosheets
  • A method for in-situ preparation of highly dispersed metal catalysts by growing two-dimensional nanosheets
  • A method for in-situ preparation of highly dispersed metal catalysts by growing two-dimensional nanosheets

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 3.6349g nickel nitrate hexahydrate in 10ml deionized water to prepare salt solution A1, impregnate A1 solution in 7.3363g commercial γ-Al 2 o 3 and ultrasonically disperse for 30 minutes, dry at 120°C for 2 hours, pass through nitrogen protection, place in an ice-water bath, and mechanically stir vigorously; prepare a reducing agent mixture B1 containing 1.8915 g of sodium borohydride, 0.2 g of sodium hydroxide and 25 ml of water . Add the prepared reducing agent mixture B1 dropwise to the above impregnation system with a peristaltic pump. The dropwise addition time is 90 minutes. After the dropwise addition, continue to react for 2 hours to wait for sufficient reduction. Suction filter the reacted product, and then filter it with deionized water and dehydrated ethanol until the filtrate is neutral, then put it into a beaker with 200ml dehydrated ethanol and stir it openly, the stirring speed is 400r / min, and the stirring time 16h, the catalyst precursor of n...

Embodiment 2

[0026] Dissolve 5.0500g of ferric nitrate nonahydrate in 8ml of deionized water to prepare salt solution A, impregnate solution A in 6.1136g of commercial SiO 2 and ultrasonically disperse for 30 minutes, dry at 120°C for 2 hours, pass through nitrogen protection, place in an ice-water bath, and mechanically stir vigorously; prepare a reducing agent mixture B containing 1.8915 g of sodium borohydride, 0.2 g of sodium hydroxide and 25 ml of water . Add the prepared reducing agent mixture B to the above impregnation system dropwise with a peristaltic pump. The dropwise addition time is 90 minutes. After the dropwise addition, continue to react for 2 hours to wait for sufficient reduction. Suction filter the reacted product, and then filter it with deionized water and dehydrated ethanol until the filtrate is neutral, then put it into a beaker with 200ml dehydrated ethanol and stir it openly, the stirring speed is 400r / min, and the stirring time For 16h, the catalyst precursor of...

Embodiment 3

[0028] Dissolve 3.6379g of cobalt nitrate hexahydrate in 28ml of deionized water to prepare salt solution A, impregnate solution A in 4.8911g of commercial TiO 2and ultrasonically disperse for 30 minutes, dry at 120°C for 2 hours, pass through nitrogen protection, place in an ice-water bath, and mechanically stir vigorously; prepare a reducing agent mixture B containing 1.8915 g of sodium borohydride, 0.2 g of sodium hydroxide and 25 ml of water . Add the prepared reducing agent mixture B to the above impregnation system dropwise with a peristaltic pump. The dropwise addition time is 90 minutes. After the dropwise addition, continue to react for 2 hours to wait for sufficient reduction. Suction filter the reacted product, and then filter it with deionized water and dehydrated ethanol until the filtrate is neutral, then put it into a beaker with 200ml dehydrated ethanol and stir it openly, the stirring speed is 400r / min, and the stirring time For 16h, the catalyst precursor of...

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Abstract

A method for growing two-dimensional nanosheets to prepare metal highly dispersed catalysts in situ, by adding an alkaline aqueous solution containing sodium borohydride to an impregnation system formed by a solid carrier powder (such as an oxide or activated carbon) and a metal salt solution at a low temperature, The two-dimensional nanosheets of metal oxyhydroxides are grown on the surface of these supports. After drying and high-temperature reduction treatment, the two-dimensional nanosheets can be transformed into highly dispersed metal particle catalysts with a size as small as 3 nanometers on the surface of the support in situ. The outstanding feature of the present invention is that it is particularly suitable for synthesizing active transition metals such as iron, cobalt, nickel, copper, etc., directly on the surface of the carrier into small nanoscale metal particles under the condition of avoiding the use of protective agents or additional additives, and has excellent catalytic performance. This method can be applied and promoted as an environmentally friendly and easy method for preparing a clean surface, highly dispersed, and high-performance metal catalyst.

Description

technical field [0001] The invention belongs to the technical field of fine preparation and application of metal materials, and relates to a preparation method for obtaining a loaded highly dispersed transition metal catalyst. Background technique [0002] In the chemical production process, most of them involve heterogeneous catalytic reactions using supported transition metal solid materials as catalysts. Controlling the dispersion of active metals on the carrier, that is, obtaining highly dispersed metal particles with a size as small as possible, is crucial to improving the utilization rate of the catalyst and the catalytic activity of the reaction. have a direct impact. [0003] In order to obtain small-sized, highly dispersed metal particle catalysts, the usual methods can be divided into two categories: one is to first pass a special reduction system, and with the participation of various protective agents or additives such as organic long molecular chain polymers, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/755B01J23/745B01J23/75B01J23/72
CPCB01J23/72B01J23/745B01J23/75B01J23/755
Inventor 赵丹连危洁戴奔陈博郑振伟张宁
Owner NANCHANG UNIV
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