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In situ synthesis of chiral modified palladium nanomaterials with different morphologies

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

Inactive Publication Date: 2019-07-05
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 synthesis of chiral modified palladium nanomaterials with different morphologies
  • In situ synthesis of chiral modified palladium nanomaterials with different morphologies
  • In situ synthesis of chiral modified palladium nanomaterials with different morphologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

Embodiment 2

[0025] Example 2: Add 75 mg of tartaric acid to 100 mL of deionized water, stir and dissolve at 40 °C under normal pressure nitrogen atmosphere, add 5 mL of 10 mM chloropalladic acid after 20 min, stir for 5 min, and add 1 mL of 0.1 M ascorbic acid, 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. The obtained product was dispersed in ethanol, and the product characterization results were as follows: image 3 .

Embodiment 3

[0026] Example 3: Add 75 mg of tartaric acid to 100 mL of deionized water, stir and dissolve at 90 °C under normal pressure nitrogen atmosphere, add 5 mL of 10 mM chloropalladic acid after 20 min, stir for 5 min, and add 1 mL of 0.1 M ascorbic acid, 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. The obtained product was dispersed in ethanol, and 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 specifically relates to an in-situ synthesis method of chiral-modified palladium nanometer materials with different shapes. In the present invention, chiral modifiers (such as chiral amino acids, chiral carboxylic acids, or chiral cinchonaine) containing functional groups such as amine groups and carboxyl groups are used to replace traditional surface covering agents, and the growth rates of different crystal planes of palladium are investigated. Regulation, ascorbic acid, benzaldehyde, etc. are used as reducing agents to reduce palladium metal precursors, and in situ synthesize chiral-modified palladium nanomaterials. By adjusting the type of chiral modifier, the type of reducing agent and the reaction temperature, chiral modified palladium nanomaterials with different shapes can be obtained, such as cubes, flowers, polyhedrons, dendrites, clusters, etc. The synthesized chiral modified palladium nanomaterials have broad application prospects in heterogeneous asymmetric catalysis as chiral modified metal catalysts.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and particularly relates to a synthesis method of chiral modified palladium nanomaterials 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 have the advantages of single shape and measurable surface atomic arrangement, which are ideal model catalysts. However, so far, the research on the catalytic performance of metal nanocrystals has focused more on electrochemical tests, and the research on heterogeneous catalysis is limited, and there is no report in heterogeneous asymmetric catalysis. The main reason is that metal nanocrystals The surface cleanliness cannot meet the requirements of heterogeneous asymmetric catalysis. It is well known that in order to control the...

Claims

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Application Information

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Patent Type & Authority Patents(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