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Method for fast modifying surface of palladium catalyst

A palladium catalyst and a catalyst technology, applied in the field of nanoscience, can solve the problems of inability to optimize treatment, difficult to prepare in large quantities, complicated methods, etc., and achieve the effects of convenient large-scale modification, low cost, and simple modification process

Inactive Publication Date: 2017-12-01
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, so far, the above work still has shortcomings: the second expensive metal modification is used to regulate the metal surface, the method is more complicated, it is difficult to prepare in large quantities, and the cost is high
Second, it is more practical to optimize the surface of commercial palladium carbon and supported palladium catalysts. However, the above methods cannot directly optimize the surface of commercial palladium carbon and supported palladium catalysts.

Method used

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  • Method for fast modifying surface of palladium catalyst
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  • Method for fast modifying surface of palladium catalyst

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Effect test

Embodiment 1

[0043] The method for the rapid modification palladium catalyst surface of the present invention comprises the following steps:

[0044] 1) Disperse 10 mg of palladium cubic nanocrystals in 5 mL of oleylamine to obtain a reaction solution, wherein the concentration of palladium in the reaction solution is 2 mg / mL;

[0045] 2) The reaction solution was stirred in an oil bath at 180° C., and 0.4 mL of tri-n-octyl phosphorus was added to react for 20 seconds, then centrifuged and washed to obtain a modified palladium catalyst, wherein the thickness of the palladium phosphorus layer was 0.3 nm.

Embodiment 2

[0047] The method for the rapid modification palladium catalyst surface of the present invention comprises the following steps:

[0048] 1) Disperse 10 mg of palladium cubic nanocrystals in 5 mL of oleylamine to obtain a reaction solution, the concentration of palladium in the reaction solution is 2 mg / mL;

[0049] 2) The reaction solution was stirred in an oil bath at 180° C., and 0.4 mL of tri-n-octylphosphine was added to react for 1 minute, and then centrifuged and washed to obtain a modified palladium catalyst, wherein the palladium-phosphorus layer The thickness is 0.5 nm.

Embodiment 3

[0051] The method for the rapid modification palladium catalyst surface of the present invention comprises the following steps:

[0052] 1) Disperse 10 mg of palladium cubic nanocrystals in 5 mL of oleylamine to obtain a reaction solution, the concentration of palladium in the reaction solution is 2 mg / mL;

[0053]2) The reaction solution was stirred in an oil bath at 180°C, and 0.4 mL of tri-n-octylphosphine was added to react for 2 minutes, and then centrifuged and washed to obtain a modified palladium catalyst, wherein the palladium-phosphorus layer The thickness is 0.7 nm.

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Abstract

The invention relates to a method for fast modifying the surface of a palladium catalyst. The method comprises the following steps of (1) weighing the palladium catalyst and a dispersing agent; then, dispersing the palladium catalyst into the dispersing agent to obtain reaction liquid; (2) adding a phosphorus source into the reaction liquid for reaction during the stirring; after the reaction is completed, performing centrifugation and washing on reaction products; obtaining the modified palladium catalyst. The method has the advantages that electron structures on the surface of the palladium catalyst are changed; the operation is simple; the cost is low; the mass preparation is convenient; meanwhile, the method is applicable to the optimization of the surface of the commercial palladium carbon catalysts.

Description

technical field [0001] The invention belongs to the field of nano science and relates to a method for quickly modifying the surface of a palladium catalyst. Background technique [0002] Palladium nano-catalysts are widely used in petrochemical, automobile exhaust treatment, fuel cells and other fields. Palladium is scarce in the earth's crust, so it is expensive. my country's palladium metal resources are even more scarce, mainly distributed in Yunnan and Gansu provinces. How to improve the activity, selectivity and stability of noble metal palladium catalyst is of great significance to the efficient utilization of rare resources and the development of national economy in our country. For catalytic reactions, catalysis mainly occurs on the few layers of atoms on the surface of the catalyst. Therefore, the electronic structure state of several layers of atoms on the surface of the catalyst largely determines its activity and selectivity. In order to improve the electronic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/185B01J37/28
CPCB01J27/1856B01J37/28B01J35/393B01J35/30B01J35/23
Inventor 金明尚李祥刘亚明
Owner XI AN JIAOTONG UNIV
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