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In-situ synthesizing method of chirally-modified palladium nanometer material of different morphologies

A synthesis method and in-situ synthesis technology, applied in the direction of nanotechnology, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., to achieve the effect of broad application prospects

Inactive Publication Date: 2018-05-15
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In asymmetric catalytic reactions, the residual capping agent on the surface of metal nanocrystals has many adverse effects on the research of heterogeneous asymmetric catalysis

Method used

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  • In-situ synthesizing method of chirally-modified palladium nanometer material of different morphologies
  • In-situ synthesizing method of chirally-modified palladium nanometer material of different morphologies
  • In-situ synthesizing method of chirally-modified palladium nanometer material of different morphologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: Add 400 mg proline to 100 mL deionized water, stir and dissolve at 50 °C under a nitrogen atmosphere at normal pressure, add 800 uL 0.1 M ascorbic acid after 20 min, stir evenly, add 5 mL 10 mM chloropalladium acid , and stirred for 30 min. After the reaction, the product was collected by centrifugation, the sample was washed twice with water and twice with ethanol, and the obtained product was dispersed in ethanol. The product characterization results were as follows: Figure 1-2 .

Embodiment 2

[0025] Example 2: 75 mg of tartaric acid was added to 100 mL of deionized water, stirred and dissolved at 40 °C under a nitrogen atmosphere at normal pressure, 5 mL of 10 mM chloropalladium acid was added after 20 min, stirred for 5 min, and 1 mL of 0.1 M ascorbic acid was added, The reaction was stirred for 60 min. After the reaction, the product was collected by centrifugation, the sample was washed twice with water and twice with ethanol, and the obtained product was dispersed in ethanol. The product characterization results were as follows: image 3 .

Embodiment 3

[0026] Example 3: 75 mg of tartaric acid was added to 100 mL of deionized water, stirred and dissolved at 90 °C under a nitrogen atmosphere at normal pressure, 5 mL of 10 mM chloropalladium acid was added after 20 min, stirred for 5 min, and 1 mL of 0.1 M ascorbic acid was added, The reaction was stirred for 60 min. After the reaction, the product was collected by centrifugation, the sample was washed twice with water and twice with ethanol, and the obtained product was dispersed in ethanol. The product characterization results were as follows: Figure 4 .

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Abstract

The invention belongs to the technical field of inorganic materials, and particularly discloses an in-situ synthesizing method of a chirally-modified palladium nanometer material of different morphologies. A traditional surface covering agent is replaced with a chirally modifying agent (such as chiral amino acid, chiral carboxylic acid and chiral cinchona alkaloid) with amido groups, carboxyl groups and other functional groups, the growth speed of different palladium crystal faces is controlled, ascorbic acid, benzaldehyde and the like serve as a reducing agent to reduce metal precursors of palladium, and the chirally-modified palladium nanometer material is synthesized in situ. By adjusting the type of the chirally modifying agent, the type of a reducing agent and the reaction temperature, the chirally-modified palladium nanometer material of different morphologies such as cuboid shape, flower shape, polyhedron, dendrite and cluster shape can be obtained. The synthesized chirally-modified palladium nanometer material serves as the chirally-modified metal catalyst and has wide application prospects in multi-phase asymmetrical catalysis.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a synthesis method of chiral modified palladium nanometer materials with different shapes. Background technique [0002] Chiral modified metal catalysts have important applications in heterogeneous asymmetric catalysis (J. Am. Chem. Soc., 2015, 137, 12121; Chem. Soc. Rev., 2015, 44, 7449). Metal nanocrystals with controllable morphology are ideal model catalysts due to their single shape and measurable arrangement of surface atoms. However, so far, the research on the catalytic performance of metal nanocrystals is more focused on electrochemical tests, and the research on heterogeneous catalysis is limited, and there is no report on heterogeneous asymmetric catalysis. The surface cleanliness cannot meet the requirements of heterogeneous asymmetric catalysis. As we all know, in the synthesis process of metal nanocrystals, in order to control the morpholog...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F9/24B82Y40/00B01J23/44
CPCB82Y40/00B01J23/44B22F9/24B22F1/054B22F1/145
Inventor 高秀云陈雪莹贺鹤勇
Owner FUDAN UNIV
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