Preparation method of silica core/mesoporous silica shell-supported gold nano-particle microspheres

A technology of mesoporous silica and gold nanoparticles, applied in the field of preparation of gold-loaded nanocatalysts, can solve the problems of poor morphology and uniformity of mesoporous silica-loaded gold catalysts

Inactive Publication Date: 2012-12-26
HEILONGJIANG UNIV
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  • Summary
  • Abstract
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing gold nanoparticle microspheres supported by silica core / mesoporous silica shell in order to solve the problem of poor morphology and uniformity of existing mesoporous silica-supported gold catalysts

Method used

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  • Preparation method of silica core/mesoporous silica shell-supported gold nano-particle microspheres
  • Preparation method of silica core/mesoporous silica shell-supported gold nano-particle microspheres
  • Preparation method of silica core/mesoporous silica shell-supported gold nano-particle microspheres

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specific Embodiment approach 1

[0021] Embodiment 1: In this embodiment, the preparation method of silica core / mesoporous silica shell supporting gold nanoparticle microspheres is implemented according to the following steps:

[0022] 1. Preparation of silica nanoparticle sol solution: Mix 15-35mL of ammonia water with a mass concentration of 28%, 360-600mL of absolute ethanol and 30-60mL of deionized water, stir at room temperature for 20-40min, and then Add 25-50mL tetraethyl orthosilicate, and continue to stir for 5-8 hours to obtain a silica nanoparticle sol;

[0023] 2. Preparation of silica / mesoporous silica nanoparticles with core-shell structure: Dilute 100mL of silica nanoparticle sol with 165-230mL of deionized water, add 20-45mL of deionized water with a concentration of 110mmol / L Hexaalkyltrimethylammonium bromide solution, stirred for 20~40min, then added dropwise 1.6~3.1mL tetraethyl orthosilicate and continued to stir for 10~15h, the product was centrifuged and washed three times, then dried a...

specific Embodiment approach 2

[0028] Embodiment 2: This embodiment differs from Embodiment 1 in that step 2 adds 26-35 mL of cetyltrimethylammonium bromide solution with a concentration of 110 mmol / L. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0029] Embodiment 3: This embodiment differs from Embodiment 1 in that step 2 adds 30 mL of cetyltrimethylammonium bromide solution with a concentration of 110 mmol / L. Other steps and parameters are the same as those in Embodiment 1.

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Abstract

The invention discloses a preparation method of silica core / mesoporous silica shell-supported gold nano-particle microspheres, and relates to a preparation method of a gold-supported nano-catalyst. The preparation method is to solve the problem of poor morphology and uniformity of the existing mesoporous silica-supported gold catalyst. The preparation method disclosed by the invention comprises the following steps: step one, preparing a silica nano-particle sol solution; step two, diluting the sol solution with de-ionized water, adding cetyltrimethylammonium bromide solution, stirring, then dripping tetraethyl orthosilicate, and then obtaining nano-particles having a core-shell structure by drying and calcination; step three, dripping a silane coupling agent, heating for reflux, and obtaining nano-particles with amino groups by centrifugation and ultrasonic washing; and step four, adding chloroauric acid, adjusting the pH value with hydrochloric acid, then dripping sodium borohydride to reduce chloroauric acid. The silica core / mesoporous silica shell-supported gold nano-particle microspheres prepared by the preparation method are uniform in particle size, the distribution of gold nano-particles is uniform, and the gold nano-particle microspheres are mainly applied to adsorption and catalysis reactions.

Description

technical field [0001] The invention relates to a preparation method of a gold-loaded nanometer catalyst. Background technique [0002] Elemental gold (Au) has been considered as an inert metal for a long time, lacking in adsorption and catalytic activity. Japanese scholar Harata pioneered the application of nano-sized Au particles in adsorption and catalytic reactions. At present, it is known that nano-Au particles of a specific size dispersed on the carrier can effectively catalyze CO oxidation, nitrogen oxide reduction, and propylene epoxidation reactions. Therefore, the catalytic effect of Au has attracted extensive attention in catalytic chemistry and other fields. become a hot topic of research. Mesoporous SiO 2 As a carrier for the preparation of nano-Au catalysts, its large specific surface area can improve the dispersion of nano-Au, and the highly dispersed nano-Au particles in its pores are not easy to coalesce and grow, thus improving the stability of nano-Au i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J35/08B01J20/10
Inventor 孙立国吕莉丽汪成张艳红耿文浩
Owner HEILONGJIANG UNIV
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