Preparation method and application of nano monocrystal Pd core-shell catalyst

A nano-single crystal, core-shell technology, applied in catalyst activation/preparation, preparation of organic compounds, chemical instruments and methods, etc., can solve the problems of reducing catalytic activity, prone to agglomeration, etc. Pollution, good selectivity

Inactive Publication Date: 2012-07-18
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it is precisely because of the high specific surface energy of nanoparticles that they are prone to agglomeration during use, thereby reducing the catalytic activity.

Method used

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  • Preparation method and application of nano monocrystal Pd core-shell catalyst
  • Preparation method and application of nano monocrystal Pd core-shell catalyst
  • Preparation method and application of nano monocrystal Pd core-shell catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take 1.5 g of porous glass microspheres etched by subcritical water and have a core-shell structure particle size of 95-105 μm and mix them with palladium chloride solution with an initial concentration of 100 ppm, and stir in a constant temperature water bath at 25°C for 24 hours. The color of the porous glass microspheres gradually changed from white to khaki. After the adsorption reached equilibrium, the porous glass microspheres loaded with palladium ions were taken out and washed 5 times with deionized water to remove the PdCl on the surface of the material. 2 . Then it was dried in an oven at 80°C. Place the dried porous glass microspheres in a hydrogen reduction furnace, heat them to 100°C in a hydrogen atmosphere to reduce the porous glass microspheres for 7 hours, and stop the flow of hydrogen after the samples are cooled to room temperature with the hydrogen reduction furnace, and then the nanometer cells can be obtained. Crystalline Pd core-shell catalysts....

Embodiment 2

[0033] Take 1.0 g of porous glass microspheres etched by subcritical water and have a core-shell structure particle size of 95-105 μm and mix them with palladium chloride solution with an initial concentration of 10 ppm, and stir in a constant temperature water bath at 35°C for 8 hours. The color of the porous glass microspheres gradually changed from white to khaki. After the adsorption reached equilibrium, the porous glass microspheres loaded with palladium ions were taken out and washed 6 times with deionized water to remove the PdCl on the surface of the material. 2 . Then it was dried in an oven at 60°C. Place the dry porous glass microspheres in a hydrogen reduction furnace, heat them to 200°C in a hydrogen atmosphere to reduce the porous glass microspheres for 5 hours, and stop the flow of hydrogen after the samples are cooled to room temperature with the hydrogen reduction furnace to obtain nanometer single particles. Crystalline Pd core-shell catalysts.

Embodiment 3

[0035] Take 3.0 g of porous glass microspheres etched by subcritical water and have a core-shell structure particle size of 95-105 μm and mix them with palladium chloride solution with an initial concentration of 60 ppm, and stir in a constant temperature water bath at 50° C. for 10 h. The color of the porous glass microspheres gradually changed from white to khaki. After the adsorption reached equilibrium, the porous glass microspheres loaded with palladium ions were taken out and washed 8 times with deionized water to remove the PdCl on the surface of the material. 2. Then it was dried in an oven at 90°C. Place the dry porous glass microspheres in a hydrogen reduction furnace, heat them to 300°C in a hydrogen atmosphere to reduce the porous glass microspheres for 4 hours, and stop the flow of hydrogen after the samples are cooled to room temperature with the hydrogen reduction furnace, and then the nanometer cells can be obtained. Crystalline Pd core-shell catalysts.

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Abstract

The invention discloses a preparation method and application of a nano monocrystal Pd core-shell catalyst, and belongs to the technical field of inorganic nano catalytic materials. According to the method, cellular glass microspheres which are etched by subcritical water and have core-shell structures are used as a carrier to load Pd<2+> ions, and the metal ion-loaded glass microspheres are reduced in hydrogen atmosphere to form the nano monocrystal Pd core-shell catalyst which is high in dispersibility and has different load capacity. The method for preparing the nano monocrystal Pd core-shell catalyst is easy to operate and low in production cost and is suitable for large-scale industrial production, and organic pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of inorganic nano catalytic materials, in particular to a preparation method and application of a nano single crystal Pd core-shell catalyst. Background technique [0002] Metal nanoparticles are widely used in optical materials, separation, catalysis and other fields due to their large specific surface area and special surface properties. Especially in the field of catalysis, it has attracted the attention of researchers because of its higher catalytic activity due to more defects and active sites than bulk metals. [0003] In chemical production, the transition metal Pd element is a commonly used catalyst, which has shown good performance for hydrogenation, oxidation, dehydrogenation, and hydrolysis reactions. Especially as an excellent hydrogenation reaction catalyst, it is widely used in the production of hydrogen peroxide system by anthraquinone method. Hydrogen peroxide is a green chemical product, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44B01J35/00B01J37/30C07C35/40C07C29/145
Inventor 王玉军申春骆广生王凯孙怡文
Owner TSINGHUA UNIV
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