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
CN102836710AInactive Publication Date: 2012-12-26HEILONGJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HEILONGJIANG UNIV
Publication Date
2012-12-26
Estimated Expiration
Not applicable · inactive patent

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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.
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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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