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Method for preparing nano palladium metal catalyst

A technology of metal catalysts and nano-palladium, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as complex processes and unfavorable large-scale production, and achieve Easy to recover, not easy to deactivate, high activity effect

Inactive Publication Date: 2014-03-26
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation methods of these nano-palladium catalysts can obtain highly active nano-metal catalysts, but most of the processes are complicated, which is not conducive to large-scale production

Method used

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  • Method for preparing nano palladium metal catalyst
  • Method for preparing nano palladium metal catalyst
  • Method for preparing nano palladium metal catalyst

Examples

Experimental program
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Effect test

Embodiment example 1

[0019]

[0020] Under an argon atmosphere, weigh 0.2g functional additive A1 and dissolve it in 4mL of toluene, stir for 30min, then add 0.8g SiO 2 (Specific surface is 420m 2 / g), stirred at 80°C for 4h, cooled to room temperature, and then added 1mL of Pd(OAc) with a concentration of 0.02g / mL 2 Toluene solution, stirred at 80°C for 6h, filtered, washed the filter cake with toluene, dried the filter cake under vacuum at room temperature, and reduced it under hydrogen atmosphere at 200°C for 3h, added 4mL of toluene to the solid obtained above, and then added 0.1g tetraethyl orthosilicate, Stir at 50°C for another 10h, filter, wash the filter cake with toluene, and vacuum-dry the filter cake at 50°C for 20h to obtain the final catalyst C1.

Embodiment example 2

[0022] Under an argon atmosphere, weigh 0.3g functional additive A1 and dissolve it in 4mL of toluene, stir for 30min, then add 0.7g SiO 2 (Specific surface is 420m 2 / g), stirred at 80°C for 4h, cooled to room temperature, and then added 0.5mL of Pd(OAc) with a concentration of 0.02g / mL 2 Toluene solution, stirred at 50°C for 6h, filtered, washed the filter cake with toluene, dried the filter cake under vacuum at room temperature, and reduced it under hydrogen atmosphere at 200°C for 3h, added 4mL of toluene to the solid obtained above, and then added 0.1g tetraethyl orthosilicate, Stir at 50°C for another 8h, filter, wash the filter cake with toluene, and vacuum-dry the filter cake at 50°C for 20h to obtain the final catalyst C2.

Embodiment example 3

[0024]

[0025] Under an argon atmosphere, weigh 0.1g of functional aid A2 and dissolve it in 4mL of methanol, stir for 30min, then add 0.9g of treated SiO 2 (Specific surface is 420m 2 / g), after stirring at 25°C for 48h, add 0.5mL of Pd(OAc) with a concentration of 0.01g / mL 2 Methanol solution, stirring at 25°C for 8h, filtering, washing the filter cake with methanol, drying the filter cake under vacuum at room temperature, reducing it under hydrogen for 6h at 180°C, adding 4mL of methanol to the reduced catalyst, and then adding 0.1g of orthosilicate Ethyl ester, stirred at 25°C for another 16h, filtered, washed the filter cake with methanol, and vacuum-dried at 50°C for 12h to obtain the final catalyst C3.

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Abstract

The invention discloses a method for preparing a nano palladium metal catalyst. The method for preparing the nano palladium metal catalyst comprises the steps of performing functional grafting pretreatment on a carrier, dipping a palladium salt solution, reducing the palladium salt solution to obtain nano metal particles, and finally coating the nano metal particles separately by using an embedding agent to obtain a final solid-supported nano palladium metal catalyst. The method is characterized by comprising functionally grafting the carrier and separately coating a nano metal catalyst; the effect of the method is shown in a grafting effect of a functional additive, so that forming and dispersing of the nano palladium metal particles are facilitated; through the embedding agent, the stability of the catalyst is improved in the process of using a palladium nanoparticle catalyst; the recycling of the catalyst is facilitated, and the catalyst can be reused. The preparation method of the catalyst is simple and convenient, cheap and easily available in raw materials and applicable to industrial production.

Description

technical field [0001] The present invention relates to a kind of method for preparing nanometer palladium metal catalyst, relate in particular to the method for preparing a kind of immobilized type nanometer palladium metal catalyst, which involves the addition of functional auxiliary agent which has coordination effect with metal, and functional auxiliary agent can be combined with The grafting effect of the carrier is beneficial to the formation and stability of the catalyst. At the same time, the embedding agent of nano-palladium metal is introduced, which can separate and cover the nano-palladium catalyst and prevent the aggregation and deactivation of the metal palladium particles during the reaction process. Background technique [0002] Nanoscale noble metal catalysts are gradually becoming a typical representative of high-efficiency catalysts and a hotspot in catalyst research. However, due to the large specific surface area of ​​nanoparticles, it is very unstable a...

Claims

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Application Information

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IPC IPC(8): B01J23/44B82Y30/00B82Y40/00C07C209/18C07C211/48C07C15/16C07C5/05
CPCY02P20/584
Inventor 黄军陈华席其周
Owner NANJING UNIV OF TECH
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