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Preparation method of SiO2-coated core-shell structure catalyst

A core-shell structure and catalyst technology is applied in the field of preparation of Ni/ZrO2SiO2 core-shell structure catalysts, which can solve the problems of difficulty in controlling the particle size of precious metal nanoparticles, complicated preparation process, complicated operation process, etc.

Inactive Publication Date: 2014-09-24
TAIYUAN UNIV OF TECH +1
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Problems solved by technology

Chinese patent CN101623634 proposes a method for preparing a core-shell nanocatalyst wrapped with noble metal nanoparticles. The general formula of the catalyst is NMPX, where NMP is nanoparticles such as Pd, AgPd or Au, and X is spherical SiO 2 , Hollow SnO 2 Spheres or hollow C spheres, which can produce core-shell structures of noble metal particles smaller than 10 nanometers, but the preparation process is more complicated
The operation process of this method is complicated, and the core part is noble metal. Since the acid solution can only corrode the iron oxide and has no effect on the noble metal, it is difficult to control the particle size of the noble metal nanoparticles.

Method used

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  • Preparation method of SiO2-coated core-shell structure catalyst
  • Preparation method of SiO2-coated core-shell structure catalyst

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0028] Catalyst preparation: weigh 1.45g Ni(NO 3 ) 2 ·6H 2 O and 2.145g Zr(NO 3 ) 4 ·5H 2 O was added to 40ml deionized water to fully dissolve to obtain a mixed solution; weigh 330mg polyethylene glycol and 1.0g NaOH and dissolve them in 100ml deionized water to obtain a mother liquor; add the mixed solution dropwise to the mother liquor while stirring, and stir at room temperature One hour. The hydrogel was collected by centrifugation, washed with water and alcohol, dried in air at 50°C for 24 hours, and then transferred to a muffle furnace for calcination at 500°C for 2 hours to obtain nanoparticles. Weigh 0.2g of nanoparticles and 1.0g of polyvinylpyrrolidone, disperse them in 100ml of ethanol, stir at room temperature for 12 hours, add 10ml of ammonia water, place in an ultrasonic oscillator for 30 minutes of ultrasonic oscillation, add 0.1ml of tetraethyl orthosilicate and 5ml of ethanol, and ultrasonically shake for 1 hour as needed. The product was collected by ...

Embodiment approach 2

[0035] Catalyst preparation refers to Embodiment 1, the reaction temperature is changed to 650°C and 700°C respectively, and the rest of the conditions are the same. The evaluation results are shown in Table 2.

[0036] Table 2 Ni / ZrO 2 SiO 2 Catalytic performance of catalysts at different reaction temperatures

[0037] Example

Embodiment approach 3

[0039] Catalyst Preparation Referring to Embodiment 1, the Ni / Zr ratios are 1:0.5 and 1:1.5 respectively, and the rest of the conditions are the same. The evaluation conditions refer to Implementation Mode 1, and the evaluation results are shown in Table 3.

[0040] Table 3 Ni / ZrO with different Ni / Zr ratios 2 SiO 2 The effect of catalytic performance

[0041] Example

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Abstract

The invention discloses a preparation method of a SiO2-coated core-shell structure catalyst, which belongs to the technical field of natural gas chemical industry and coal chemical industry, and mainly solves the problems of easiness in sintering and carbon deposit of the catalyst in the catalysis process. The preparation method of a SiO2-coated Ni / ZrO2@SiO2 core-shell structure catalyst for synthesis gas obtained by partial methane oxidation is characterized by comprising the following steps: preparing nano-scale Ni / ZrO2 particles by using a co-precipitation method; treating the surfaces of the particles by using polyvinylpyrrolidone, and performing ultrasonic dispersion in the alkaline environment; adding a soluble silicon source; performing centrifugal collection, water washing, alcohol washing, drying, roasting and reduction to obtain the Ni / ZrO2@SiO2 core-shell structure catalyst. The Ni / ZrO2@SiO2 core-shell structure catalyst prepared by using the process method has excellent anti-sintering and anti-carbon deposit performances in the partial methane oxidation reaction of the synthesis gas.

Description

technical field [0001] A kind of SiO of the present invention 2 The invention discloses a method for preparing a wrapped core-shell structure catalyst, which belongs to the technical field of natural gas chemical industry and coal chemical industry. Specifically relate to a kind of SiO that is used for the partial oxidation of methane synthesis gas 2 Coated Ni / ZrO 2 SiO 2 The preparation method of the core-shell structure catalyst. Background technique [0002] With the reduction of oil resources, the development and utilization of natural gas has gradually attracted the attention of scholars. The chemical utilization of methane is mainly realized by catalytic conversion into synthesis gas. The processes for converting natural gas into synthesis gas include steam reforming, carbon dioxide reforming and partial methane oxidation. Compared with the other two methods, the partial oxidation of methane has the advantages of small reactor volume, high efficiency, and low ene...

Claims

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Application Information

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IPC IPC(8): B01J23/755C01B3/40C01B3/36
CPCY02P20/52
Inventor 刘世斌王俊文丁传敏高晓峰韩玉林张红军
Owner TAIYUAN UNIV OF TECH
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