Method for preparing high-strength carbon nano tube supported platinum catalyst

A carbon nanotube and platinum catalyst technology is applied in the field of preparation of carbon nanotube-supported platinum hydrogenation catalyst, which can solve the problems of loose carbon tube structure, industrial application limitation, high pressure crushing strength of Pt/CNT catalyst, etc., and achieve high hydrogenation The effect of conversion rate, good selectivity

Inactive Publication Date: 2011-10-12
BEIJING UNIV OF CHEM TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] However, the structure of primary carbon nanotubes is loose, and the existing pretreatment of carbon nanotubes and noble metal loading technology cannot ensure the high crushing strength of the resulting Pt / CNT catalyst, which is limited in industrial applications.

Method used

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  • Method for preparing high-strength carbon nano tube supported platinum catalyst
  • Method for preparing high-strength carbon nano tube supported platinum catalyst

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Embodiment 1-2

[0025] The preparation of embodiment 1-2 carbon nanotube supported platinum (Pt / CNT) catalyst

[0026] 4g primary carbon nanotubes are placed in the mixed acid of 200ml concentrated sulfuric acid and concentrated nitric acid (volume ratio H 2 SO 4 : HNO 3 = 3:1), condensed and refluxed in an oil bath at 120°C and 130°C under mechanical stirring for 1 hour, cooled to room temperature, filtered, washed with deionized water until neutral, and then dried in a clean oven at 110°C for 24 hours . They are denoted as CNT-120 and CNT-130, respectively.

[0027] Weigh 0.24g of the treated carbon nanotubes, add an appropriate amount of water, and ultrasonically treat for 10 minutes to form a carbon slurry, then pipette 0.8ml of chloroplatinic acid solution with a concentration of 0.0772mol / L into the carbon slurry, and adjust to neutral with ammonia water , sonicate evenly, after soaking for 24 hours, add an appropriate amount of ethanol and evaporate the solution to dryness in a rot...

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Abstract

The invention provides a method for preparing high-strength carbon nano tube supported platinum catalyst applicable to industrial application, comprising the following steps: preprocessing, namely heating and refluxing a protogenic carbon nano tube in mixed acid of 98wt% concentrated sulfuric acid and 60-63wt% concentrated nitric acid at a volume ratio of 3:1 and at a temperature of 100-130 DEG C, then filtering, washing and drying; impregnating, namely mixing the preprocessed carbon nano tube and a chloroplatinic acid solution, standing for 24 hours, adding absolute ethyl alcohol the volume of which is no more than 50% of the total volume, evaporating a solvent by utilizing a rotary evaporator, and smashing to obtain particles with the granularity of 80-100 meshes; and reducing, namely processing in a hydrogen flow at the temperature of 350 DEG C for 2 hours, cooling to room temperature, and passivating in 20% nitrogen-air for 1 hour. The obtained catalyst has good catalytic activity on nitrobenzene hydrogenation reaction, and the crushing strength reaches 20N.mm<-1>.

Description

technical field [0001] The invention relates to a preparation method of a carbon nanotube supported platinum hydrogenation catalyst, which is characterized in that the obtained catalyst has high crushing strength and is suitable for industrial application. technical background [0002] Crushing strength is an important parameter for the industrial application of hydrogenation catalysts. In order to avoid severe damage during transportation, loading and use, resulting in increased bed pressure drop during use, the hydrogenation catalyst requires high mechanical (crushing) strength. The mechanical strength of a hydrogenation catalyst depends primarily on the strength of the corresponding support. [0003] On the other hand, as a new type of catalyst carrier, carbon nanotubes (CNTs) have excellent electronic conductivity, special adsorption and desorption properties for reactant species and reaction products, special pore space stereoselectivity, carbon and The strong metal-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42C07C211/46C07C209/36
Inventor 金劭张敬畅骞伟中
Owner BEIJING UNIV OF CHEM TECH
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