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Copper-modified palladium-titanium dioxide nano composite material as well as preparation method and application thereof

A nano-composite material, titanium dioxide technology, applied in the field of material chemistry and catalysis, can solve problems such as reducing chemical synthesis costs, achieve the effects of low operating costs, high-efficiency photocatalytic alcoholysis reaction, and avoiding large consumption

Active Publication Date: 2021-07-09
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the prior art, the present invention provides a copper-modified palladium-titania nanocomposite material and a preparation method thereof. The catalyst loaded with the composite material is applied to the alcoholysis reaction of photocatalyzed epoxides to solve the problem of under mild reaction conditions. Synthesize β-alkoxy alcohols down, reduce the problem of chemical synthesis cost

Method used

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  • Copper-modified palladium-titanium dioxide nano composite material as well as preparation method and application thereof
  • Copper-modified palladium-titanium dioxide nano composite material as well as preparation method and application thereof
  • Copper-modified palladium-titanium dioxide nano composite material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] The preparation of the palladium nanosheet of embodiment 1 copper modification

[0049] Take 30mg of polyvinylpyrrolidone, 170mg of citric acid, 60mg of cetyltrimethylammonium bromide and 16mg of palladium acetylacetonate, put them in a 50mL flask, add 10mL of N,N-dimethylformamide, add Place the magnet on a magnetic stirrer to stir, and add 520 μL copper chloride solution (16 mmol / L) after the dissolution is complete. After stirring for 1 hour, 100 mg of tungsten hexacarbonyl was added, and then the flask was placed in an oil bath at a temperature of 80°C, and kept stirring and heating for 1 hour. After adding 30 mL of acetone, the solid product was centrifuged, washed three times with a mixture of 40 mL of acetone and 5 mL of ethanol, and then dispersed in 10 mL of ethanol to obtain a solution of copper-modified palladium nanosheets.

[0050] The copper-modified palladium nanosheets prepared in this example have a size of about 20-30 nm and a hexagonal shape.

[005...

Embodiment 2

[0052] Preparation and characterization of the palladium-titania nanocomposite material modified by embodiment 2 copper

[0053] Get 50 mg of titanium dioxide nano-sheets, put them in a 50-mL flask, add 20 mL of deionized water, then add 1 mL of the copper-modified palladium nano-sheet solution prepared in Example 1, add magnets, stir evenly on a magnetic stirrer, and place in Sonicate in an ultrasonic machine for 15 minutes, then place the flask in an oil bath at a temperature of 80°C, and keep stirring and heating for 1 hour. After the mixture was centrifuged, a precipitate was obtained in the centrifuge tube, and a copper-modified palladium-titanium dioxide nanocomposite was obtained after vacuum drying.

[0054] The TEM photo of the palladium-titania nanocomposite material modified by copper prepared in the present embodiment is as follows figure 1 As shown, it can be seen that titanium dioxide is closely adsorbed to the palladium-copper nanosheets in Example 1.

[0055]...

Embodiment 3

[0056] The preparation of embodiment 3 pure palladium-titania nanocomposites

[0057] Preparation of pure palladium nanosheets

[0058] Take 30mg of polyvinylpyrrolidone, 170mg of citric acid, 60mg of cetyltrimethylammonium bromide and 16mg of palladium acetylacetonate, put them in a 50mL flask, add 10mL of N,N-dimethylformamide, add The magnet was placed on a magnetic stirrer to stir. After stirring for 1 hour, 100 mg of tungsten hexacarbonyl was added, and then the flask was placed in an oil bath at a temperature of 80° C., and kept stirring and heating for 1 hour. After adding 30 mL of acetone, the solid product was centrifuged, washed three times with a mixture of 40 mL of acetone and 5 mL of ethanol, and then dispersed in 10 mL of ethanol to obtain a palladium nanosheet solution.

[0059] Preparation of pure palladium-titania nanocomposite material

[0060] Take 50mg of titanium dioxide nanosheets, put them in a 50mL flask, add 20mL of deionized water, then add 1mL of t...

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Abstract

The invention discloses a copper-modified palladium-titanium dioxide nano composite material and a preparation method and application thereof, the composite material takes a titanium dioxide nano structure as a carrier, and a copper-modified palladium nano structure is compounded on the surface of the composite material. The composite material can be prepared by compounding a copper-modified palladium nano-structure on a titanium dioxide nano-structure, and can also be prepared by a method for copper modification through a pure palladium-titanium dioxide nano-composite material. According to the method, a titanium dioxide nanostructure is used as a light absorption unit and an activation site of epoxide, a copper modified palladium nanostructure is used as an activation site of alcohol, efficient photocatalytic alcoholysis reactions are achieved for different kinds of epoxide and alcohol substrates, and beta-alkoxy alcohol is generated in a high-selectivity mode.

Description

technical field [0001] The invention belongs to the technical field of material chemistry and catalysis, and relates to a copper-modified palladium-titanium dioxide nanocomposite material and a preparation method thereof, as well as the application of a catalyst loaded with the composite material in the alcoholysis reaction of photocatalyzed epoxides. Background technique [0002] The β-alkoxy alcohols synthesized by the reaction of epoxides and alcohols can be used to synthesize antitumor or immunosuppressive drugs, and play an important role in pharmaceutical and chemical industries. This reaction generally needs to be carried out under heating conditions with a strong acid catalyst, and the requirements for equipment are severe. Considering the cost problem in chemical production, if solar energy, as a green and sustainable energy, can be used to drive the alcoholysis of epoxides, it will realize the synthesis of β-alkoxy alcohols under mild conditions, which will signifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89C07C41/02C07C43/23
CPCB01J23/8926C07C41/02B01J35/39C07C43/23
Inventor 熊宇杰段美林胡灿宇龙冉
Owner UNIV OF SCI & TECH OF CHINA
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