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Platinum nanometer composite catalyst, preparation and application thereof

A composite catalyst, platinum nanotechnology, applied in the preparation of amino compounds, preparation of organic compounds, catalysts for physical/chemical processes, etc., can solve problems such as limited applications

Active Publication Date: 2014-01-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Unfortunately, the dense inorganic shell coating makes it difficult for reaction molecules to access the coated metal catalytic active centers, which limits the application of this method in catalytic reactions.

Method used

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  • Platinum nanometer composite catalyst, preparation and application thereof
  • Platinum nanometer composite catalyst, preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Preparation of SiO wrapped in mesoporous zirconia shell 2 / Pt / ZrO 2 The composite nano-catalyst of structure, comprises the following steps:

[0013] (1) Preparation of SiO 2 Beads: a mixed solution of tetraethylorthosilicate (6.2mL), 6.5mL ammonia water (28wt%), absolute ethanol (100mL) and deionized water (7mL), stirred at room temperature for 15 hours. Wash twice with deionized water and ethanol respectively to obtain SiO with a diameter of 200-300nm 2 small ball.

[0014] (2) Preparation of Pt nanoparticles: polyvinylpyrrolidone (0.05g), K 2 PtCl 6 (0.068g), deionized water (20mL) mixed in a 25mL three-necked bottle, H 2 By reducing the mixture, Pt nanoparticles can be prepared.

[0015] (3) Amino surface functionalized SiO 2 Small balls: SiO 2 Disperse the pellets (1-3g) into 100mL of isopropanol, then add 3-triethoxysilyl-1-propanamine (1-3mL), heat and stir at 60-80°C for 2 hours. Amine-functionalized SiO 2 small ball.

[0016] (4) Self-assembled SiO ...

Embodiment 2

[0019] Preparation of SiO 2 / Pt core-shell nanocatalysts.

[0020] The preparation steps are the same as steps (1)-(4) in Example 1

[0021] Depend on figure 2 It can be concluded that the SiO wrapped in the mesoporous zirconia shell 2 / Pt / ZrO 2 After the composite catalyst was applied for 20 cycles, the conversion rate decreased slightly and basically remained unchanged. Catalyst SiO without mesoporous zirconia shell encapsulation 2 After 3 reaction cycles of / Pt application, the reaction conversion rate decreased rapidly, which may be due to the transfer of Pt nanoparticles from the carrier SiO 2 Caused by the shedding of the ball surface. Therefore, the SiO wrapped in the mesoporous zirconia shell prepared by the method of the present invention 2 / Pt / ZrO 2 The catalyst can be recycled many times.

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Abstract

The present invention relates to a platinum nanometer composite catalyst, preparation and an application thereof. According to the catalyst, a lot of catalysis activity centers Pt nanoparticles are supported on a SiO2 small sphere carrier to form a SiO2 / Pt core structure, and the outer surface of the SiO2 / Pt core structure is coated with a layer of mesoporous zirconium dioxide shell to form a SiO2 / Pt / ZrO2 core-shell structure. According to the present invention, with application of the catalyst in an aniline preparation reaction through nitrobenzene hydrogenation at a reaction temperature of 200-400 DEG C and a carbon monoxide catalysis oxidation reaction, the catalyst can be continuously and circularly used more than 20 cycles, and the catalysis activity basically remains unchanged; and the catalyst has characteristics of high efficiency, stability, recycling and easy recovery, wherein the catalyst is suitable for high temperature reactions with harsh reaction conditions with the protection effect of the mesoporous zirconium dioxide shell.

Description

technical field [0001] The invention relates to a platinum nanocomposite catalyst and a preparation method thereof. Specifically, the present invention relates to a noble metal catalyst that uses silicon dioxide as a carrier to support a plurality of metal Pt nanoparticles, and uses a stable mesoporous zirconia shell and a preparation method thereof, and relates to a kind of hydrogenation of p-nitrobenzene to prepare aniline reaction and the oxidation of carbon monoxide to carbon dioxide. Background technique [0002] Economic and industrial demands require the development of efficient and stable catalysts. Noble metal nanoparticles have good catalytic activity, and their catalytic activity depends on the composition, size and shape of the particles, and has received extensive attention. Noble metal nanoparticles have high specific surface areas and surface structures with different morphologies, which can be used to design catalysts with good performance. However, due to...

Claims

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Application Information

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IPC IPC(8): B01J23/42C07C211/46C07C209/36C01B31/20C01B32/50
Inventor 王延飞肖占敏梁迎春马晨菲何京陈芬芬曹青余颖龙王飞
Owner PETROCHINA CO LTD
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