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A kind of rhodium nanocrystal and preparation method thereof

A technology of nanocrystals and rhodium acetylacetonate is applied in the field of preparation of precious metal nanomaterials, and can solve the problems of less research on the morphology control of rhodium nanocrystals, and achieve the effects of easy realization, simple preparation method and cheap reagents.

Active Publication Date: 2016-08-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with nanocrystals of noble metals such as gold, silver, platinum, and palladium, the morphology control of rhodium nanocrystals is relatively less studied.

Method used

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  • A kind of rhodium nanocrystal and preparation method thereof
  • A kind of rhodium nanocrystal and preparation method thereof
  • A kind of rhodium nanocrystal and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Add 40 mg of rhodium acetylacetonate and 55 mg of polyvinylpyrrolidone into 35 mL of benzyl alcohol (concentration of rhodium acetylacetonate: 2.8 × 10 -3 mol / L, the concentration of polyvinylpyrrolidone is: 1.4×10 -2 mol / L), stirred for 20 minutes to fully dissolve the rhodium acetylacetonate and polyvinylpyrrolidone, then added the above solution into a 40mL hydrothermal reaction kettle, and reacted at 180°C for 10 hours.

[0025] After the reaction was completed, a small amount of the reaction solution was centrifuged to prepare a TEM sample, and its morphology was observed through a transmission electron microscope, as shown in figure 1 Figure (a) is shown in Figure (b) and Figure (c) are high-resolution transmission electron microscope images of rhodium icosahedron at different electron beam incident angles, and the lattice spacing marked in the figure shows that the surface of rhodium icosahedron The {111} crystal plane is used as the exposed crystal plane; combi...

Embodiment 2

[0027] Add 12 mg of rhodium acetylacetonate and 99 mg of polyvinylpyrrolidone to 35 mL of benzyl alcohol (concentration of rhodium acetylacetonate: 8.6 × 10 -4 mol / L, the concentration of polyvinylpyrrolidone is: 2.58×10 -2 mol / L), stirred for 20 minutes to fully dissolve rhodium acetylacetonate and polyvinylpyrrolidone, then added the above solution into a 40mL hydrothermal reaction kettle, and reacted at 170°C for 10 hours. After the reaction is completed, take a small amount of the reaction solution and centrifuge to prepare a TEM sample, and observe its morphology as an icosahedron through a transmission electron microscope, such as figure 2 shown.

Embodiment 3

[0029] Add 40 mg of rhodium acetylacetonate and 166 mg of polyvinylpyrrolidone into 35 mL of benzyl alcohol (concentration of rhodium acetylacetonate: 2.8 × 10 -3 mol / L, the concentration of polyvinylpyrrolidone is: 4.2×10 -2 mol / L), stirred for 20 minutes to fully dissolve the rhodium acetylacetonate and polyvinylpyrrolidone, then added the above solution into a 40mL hydrothermal reaction kettle, and reacted at 180°C for 10 hours. After the reaction was completed, a small amount of the reaction solution was taken for centrifugation to prepare a TEM sample, and its morphology was observed by a transmission electron microscope as an icosahedron, and its morphology was as follows: image 3 shown.

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Abstract

The invention discloses a rhodium nanocrystal having an icosahedral morphology with an exposed {111} crystal face. The invention also discloses a preparation method of the rhodium nanocrystal. The method comprises the following steps: dissolving rhodium acetylacetonate and polyvinylpyrrolidone in benzene methanol to obtain a mixed solution, conducting a hydrothermal reaction on the mixed solution at 170-200 DEG C for 5-15 h to obtain the rhodium nanocrystal. The invention for the first time prepares the rhodium nanocrystal having the icosahedral morphology with the exposed {111} crystal face, has important academic and practical significance; and the twin structure of the rhodium nanocrystal having the icosahedral morphology can enhance the adsorption in a catalytic reaction, thereby realizing better catalytic performance in hydrogenation reaction, hydrogenation acylation reaction and alkylation reaction, etc. The preparation method of the invention is simple and easy to realize, and the employed reagents are cheap, non-toxic and harmless.

Description

technical field [0001] The invention relates to the field of preparation of noble metal nanomaterials, in particular to a rhodium nanocrystal and a preparation method thereof. Background technique [0002] Rhodium nanocrystals are noble metal nano single crystal particles, which can be used as catalysts in the fields of hydrogenation reaction, hydroformylation, alkylation and carbon monoxide oxidation, and also have potential applications in surface Raman enhancement. The morphology and size of rhodium nanocrystals have a great influence on the performance of the above applications. Therefore, research in recent years has mainly focused on controlling the morphology and size of rhodium nanocrystals. [0003] At present, great success has been achieved in controlling the size of rhodium nanocrystals. The size of rhodium nanocrystals is mainly reduced by soft template methods such as dendrimers and micelles, and the size control is realized. However, compared with noble meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/02C30B7/14
Inventor 张辉占方伟杨德仁
Owner ZHEJIANG UNIV