Bell type platinum-based magnetic space confinement catalyst and preparation method thereof

A catalyst and platinum-based technology, applied in the field of catalyst and its preparation, can solve the problems of reducing structural stability, increasing the agglomeration and loss of noble metal nanoparticles, and limiting large-scale industrial applications, so as to avoid collision, avoid agglomeration or loss, The effect of improving catalytic activity

Active Publication Date: 2018-07-20
铜陵市科达生产力促进中心有限公司
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the construction process of the outer porous protective shell increases the probability of agglomeration and loss of noble metal nanoparticles, while the continuous collision between the magnetic core and met

Method used

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  • Bell type platinum-based magnetic space confinement catalyst and preparation method thereof

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Embodiment 1

[0021] In 40mL ethylene glycol, add 1.08g FeCl successively 3 ·6H 2 O. 0.108g of polyacrylic acid and 9g of anhydrous sodium acetate, after completely dissolving to form a homogeneous mixture, add to a 50mL reactor, react at 200°C for 14 hours, wash the product alternately with absolute ethanol and distilled water three times, and dry the product at 60°C After 12 hours, a polyacrylic acid-modified Fe with a particle size of 250 nm was obtained 3 o 4 Nanoparticles;

[0022] The above polyacrylic acid modified Fe 3 o 4 The nanoparticles were dispersed in a mixed solvent of ethanol and water at a ratio of 4:1 to form polyacrylic acid-modified Fe at a concentration of 1 g / L 3 o 4 Nanoparticle dispersion, then according to the mixed solvent and ammonia water volume ratio of 15:1, add ammonia water with a mass concentration of 28wt%, after mechanical stirring at 30°C for 10 minutes, according to the volume ratio of ammonia water to tetraethyl orthosilicate of 10:1 Tetraethyl ...

Embodiment 2

[0027] In 40mL ethylene glycol, add 1.08g FeCl successively 3 ·6H 2 O. 0.108g of polyacrylic acid and 9g of anhydrous sodium acetate, after completely dissolving to form a homogeneous mixture, add to a 50mL reactor, react at 200°C for 14 hours, wash the product alternately with absolute ethanol and distilled water three times, and dry the product at 60°C After 12 hours, a polyacrylic acid-modified Fe with a particle size of 250 nm was obtained 3 o 4 Nanoparticles;

[0028] The above polyacrylic acid modified Fe 3 o 4 The nanoparticles were dispersed in a mixed solvent of ethanol and water at a ratio of 4:1 to form polyacrylic acid-modified Fe at a concentration of 1 g / L 3 o 4 Nanoparticle dispersion, then according to the mixed solvent and ammonia water volume ratio of 20:1, add ammonia water with a mass concentration of 28wt%, after mechanical stirring at 30°C for 10 minutes, according to the volume ratio of ammonia water to tetraethyl orthosilicate is 10:1 Add tetraet...

Embodiment 3

[0034] In 40mL ethylene glycol, add 1.08g FeCl successively 3 ·6H 2O. 0.108g of polyacrylic acid and 9g of anhydrous sodium acetate, after completely dissolving to form a homogeneous mixture, add to a 50mL reactor, react at 200°C for 14 hours, wash the product alternately with absolute ethanol and distilled water three times, and dry the product at 60°C After 12 hours, a polyacrylic acid-modified Fe with a particle size of 250 nm was obtained 3 o 4 Nanoparticles;

[0035] The above polyacrylic acid modified Fe 3 o 4 The nanoparticles were dispersed in a mixed solvent of ethanol and water at a ratio of 4:1 to form polyacrylic acid-modified Fe at a concentration of 1 g / L 3 o 4 Nanoparticle dispersion, then add ammonia water with a mass concentration of 28wt% according to the volume ratio of the mixed solvent to ammonia water at 25:1, and mechanically stir at 30°C for 10 minutes, then add ammonia water to tetraethyl orthosilicate at a volume ratio of 10:1 Tetraethyl orthos...

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Abstract

The invention provides a bell type platinum-based magnetic space confinement catalyst. The bell type platinum-based magnetic space confinement catalyst is a platinum-based magnetic space confinement catalyst which is prepared by taking a Fe3O4 nanoparticle as a core, a thermo-crosslinking poly 3,4-ethylene dioxythiophene/platinum composite material as a hollow shell layer and dispersing and distributing small-sized platinum nanoparticles in the hollow shell layer structure. The preparation method of the catalyst mainly comprises the following steps: synchronously building poly 3,4-ethylene dioxythiophene/platinum composite shell layers on the surfaces of Fe3O4@SiO2 nanoparticles by utilizing redox reaction of a conductive polymer monomer 3,4-ethylene dioxythiophene and noble metal-derivedpotassium chloroplatinite to synthesize a three-layer core-shell structure platinum-based magnetic composite material, crosslinking poly 3,4-ethylene dioxythiophene chains through thermal treatment, and etching by strong base to remove a silicon dioxide middle shell layer to prepare the bell type platinum-based magnetic space confinement catalyst. The synthesis process is simplified, the agglomeration and loss phenomenon of the noble metal nanoparticles in the catalytic process is effectively avoided, the stability of the platinum nanoparticles in the catalytic process is reinforced, and highcatalytic activity is presented.

Description

technical field [0001] The invention belongs to the technical field of nanocomposite materials, and in particular relates to a catalyst and a preparation method thereof. Background technique [0002] Noble metal-based magnetically supported catalysts have both the high catalytic activity of noble metal nanoparticles and are easy to magnetically separate and recover, making them the most promising type of catalysts. Among them, the use of core-shell magnetic nanocarriers (with magnetic particles as the core and inorganic or organic materials as the shell) to directly anchor noble metal nanoparticles has become the focus of researchers' attention because of its simplicity and ease of use and the large number of exposed active sites. . However, during the catalytic process, the noble metal nanoparticles immobilized on the surface of the magnetic carrier will change their size, shape and structure due to their own high surface energy and the collision of the reaction substrate,...

Claims

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Application Information

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IPC IPC(8): B01J31/28
CPCB01J31/28B01J35/0013B01J35/0033B01J35/006B01J35/008
Inventor 郭万春李瑞飞夏启迪吴月豪田克松李雪爱徐朝鹏王海燕
Owner 铜陵市科达生产力促进中心有限公司
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