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Palladium nanocrystals and synthesis method thereof

A synthesis method and nanocrystal technology, applied in crystal growth, chemical instruments and methods, single crystal growth, etc., can solve problems such as large energy consumption, and achieve the effects of increased reaction rate, high yield, and good purity

Inactive Publication Date: 2016-02-17
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in today's industrial systems, most of the catalytic reactions are driven by heat, which consumes a lot of energy in production

Method used

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  • Palladium nanocrystals and synthesis method thereof
  • Palladium nanocrystals and synthesis method thereof
  • Palladium nanocrystals and synthesis method thereof

Examples

Experimental program
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preparation example Construction

[0040] The invention provides a method for synthesizing palladium nanocrystals, which comprises the following steps of mixing and reacting a palladium source compound, a ruthenium source compound and a surface modification reducing agent in a solvent to obtain palladium nanocrystals.

[0041] The palladium source compound in the present invention is preferably a compound containing chloropalladate; the ruthenium source compound is preferably a compound containing trivalent ruthenium. The present invention is not particularly limited to the compound containing chloropalladate group, and the compound containing chloropalladate group well known to those skilled in the art can be used. The present invention preferably includes potassium chloropalladate, sodium chloropalladate and chlorine One or more of ammonium palladium, more preferably potassium chloropalladate and / or sodium chloropalladate. The present invention is not particularly limited to the compound containing trivalent ...

Embodiment 1

[0053] Irregular palladium nanocrystals with high-index facets

[0054] 210 mg of PVP (polyvinylpyrrolidone), 120 mg of AA (ascorbic acid) and 600 mg of KBr were dissolved in 16 ml of distilled water. Place in a three-necked flask with a volume of 50 ml, heat to 80° C., and keep the temperature constant for 5 minutes to obtain a mixed solution.

[0055] 63 mg K 2 PdCl 4 Dissolved in 3 ml of distilled water, and then 5 mg of ruthenium chloride (RuCl 3 ) was dissolved in 1 ml of distilled water. K 2 PdCl 4 solution and RuCl 3 The solution was quickly injected into the mixed solution for reaction, and after constant temperature reaction for 10 minutes, PVP, AA and KBr were removed by centrifugation and distilled water washing, and irregular palladium nanocrystals with high-index crystal planes were obtained.

[0056] The irregular palladium nanocrystals with high index crystal faces prepared by the above method are detected, and the detection results show that, see figur...

Embodiment 2

[0060] 210 mg of PVP (polyvinylpyrrolidone), 120 mg of AA (ascorbic acid) and 600 mg of KBr were dissolved in 16 ml of distilled water. Place in a three-neck flask with a volume of 50 ml, heat to (100)° C., and keep the temperature constant for 5 minutes to obtain a mixed solution.

[0061] 63 mg of K2PdCl4 was dissolved in 3 ml of distilled water, and 5 mg of ruthenium chloride (RuCl3) was dissolved in 1 ml of distilled water. The K2PdCl4 solution and the RuCl3 solution were quickly injected into the mixed solution for reaction. After 10 minutes of constant temperature reaction, PVP, AA and KBr were removed by centrifugation and distilled water washing, and irregular palladium nanocrystals with high-index crystal faces were obtained.

[0062] see Figure 8 , Figure 8It is a TEM photo of the palladium nanocrystal prepared in Example 2 of the present invention, and the scale bar is 20 nm. Depend on Figure 8 It can be seen that the palladium nanocrystals prepared by the pr...

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Abstract

The invention provides a synthesis method of palladium nanocrystals. A palladium source compound, a ruthenium source compound and a surface modification reducer perform mixed reaction in a solvent to obtain the palladium nanocrystals. Ruthenium atoms are reduced on the surfaces of the palladium nanocrystals in the nucleation growth process of the palladium nanocrystals in a reducing under-potential deposition mode, accordingly the surface energy of the ruthenium atoms is affected, and formation of high-index crystal faces is prompted. The synthesis method can remarkably improve the reaction rate, has the advantages of being simple in process, moderate in condition, high in yield, good in purity and the like and is suitable for large-scale production. The irregular nanocrystals with the high-index crystal faces are obtained, have rich edge and corner sites, can widely meet the requirements on the catalysis aspect, especially have excellent light absorption characteristics, accordingly achieve the application on the solar energy aspect, can drive a variety of organic reactions under the light condition and achieve conversion from solar energy to chemical energy.

Description

technical field [0001] The invention belongs to the technical field of metal catalysts, in particular to a palladium nanocrystal and a synthesis method thereof. Background technique [0002] Catalyst is one of the most common substances in chemical reactions. It refers to substances that can change the chemical reaction rate of reactants in chemical reactions without changing the chemical balance, and their quality and chemical properties have not changed before and after the chemical reaction. It is called a catalyst, and its relationship with the reaction system is like the relationship between a lock and a key, with a high degree of selectivity. According to statistics, more than 90% of industrial processes use catalysts, such as chemical, petrochemical, biochemical, and environmental protection. Therefore, the research on catalysts in the field has always maintained a high degree of attention. [0003] There are many kinds of catalysts, and there are many classificatio...

Claims

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Application Information

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IPC IPC(8): C30B29/02C30B7/14B01J23/44
Inventor 熊宇杰龙冉
Owner UNIV OF SCI & TECH OF CHINA
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