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Large-pore-size mesoporous carbon/silicon dioxide loaded gold nano-catalyst and synthesis method thereof

A technology of silica and synthesis methods, applied in the direction of metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of easy loss of metal particles, long time-consuming, cumbersome process and other problems, to achieve the effects of easy large-scale production, considerable economic benefits, and simple synthesis methods

Inactive Publication Date: 2017-01-25
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are that it takes a long time, the process is cumbersome, and the energy consumption is high, and the dispersion of the metal introduced in the carrier is poor, the content is low, the metal particles are easy to agglomerate under high temperature conditions, and the metal particles are easy to be lost during the reaction process.

Method used

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  • Large-pore-size mesoporous carbon/silicon dioxide loaded gold nano-catalyst and synthesis method thereof
  • Large-pore-size mesoporous carbon/silicon dioxide loaded gold nano-catalyst and synthesis method thereof
  • Large-pore-size mesoporous carbon/silicon dioxide loaded gold nano-catalyst and synthesis method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] At 30°C, 4.0 g PS a -PEO b (0.13mmol) was dissolved in 20.00g tetrahydrofuran, stirred for 0.5 hours, added 1mL chloroauric acid solution (0.024mmol); 1.2mmol organic silicon source vinyltrimethoxysilane and 10.8mmol inorganic silicon source TEOS in 1.2g (0.2mol) / L) hydrochloric acid for 30 minutes; mix the two solutions, add 10 g of soluble resole phenolic resin (20 wt %), and stir at 40° C. for 2 hours. The mixed solution was then spread evenly in a petri dish and placed at room temperature for 7 hours to volatilize the organic solvent; finally, it was transferred to a 100°C oven, and after 24 hours, the product was calcined in a nitrogen atmosphere to remove the surfactant.

[0042] The obtained material has a face-centered cubic structure with a pore diameter of 7 nm and a pore volume of 0.38 cm 3 / g, the specific surface area is 325m 2 / g, the gold content is 0.5%, and the gold nanometer size is 5 nm, marked as 0.5Au-SC-7.

[0043] Its X-ray small angle scatte...

Embodiment 2

[0045] At 30°C, 2.0g PS a -PEO b (0.13mmol) was dissolved in 10.00g tetrahydrofuran, stirred for 0.5 hours, added 2mL chloroauric acid solution (0.048mmol); 1.2mmol organic silicon source vinyltrimethoxysilane and 10.8mmol inorganic silicon source TEOS in 1.2g (0.2mol) / L) hydrochloric acid for 30 minutes; mix the two solutions, add 10 g of soluble resole phenolic resin (20 wt %), and stir at 40° C. for 2 hours. The mixed solution was then spread evenly in a petri dish and left at room temperature for 7 hours to volatilize the organic solvent; finally, it was transferred to a 100°C oven, and after 24 hours, the solid was calcined in a nitrogen atmosphere to remove the surfactant.

[0046] The obtained material has a face-centered cubic structure with a pore size of 12 nm and a pore volume of 0.24 cm. 3 / g, the specific surface area is 347m 2 / g, the gold content is 1%, the gold nanometer size is 4 nm, and it is marked as 1Au-SC-12.

[0047] Its characteristic X-ray small a...

Embodiment 3

[0049] At 30°C, 4.0 g PS a -PEO b (0.13mmol) was dissolved in 20.00g tetrahydrofuran, stirred for 0.5 hours, added 5ml chloroauric acid solution (0.072mmol); 1.2mmol organic silicon source vinyltrimethoxysilane and 10.8mmol inorganic silicon source TEOS in 1.2g (0.2mol) / L) hydrochloric acid for 30 minutes; mix the two solutions, add 10.0 g of soluble resole phenolic resin (20 wt %), and stir at 40° C. for 2 hours. The mixed solution was then spread evenly in a petri dish and placed at room temperature for 7 hours to volatilize the organic solvent; finally, it was transferred to a 100°C oven, and after 24 hours, the product was calcined in a nitrogen atmosphere to remove the surfactant.

[0050] The obtained material has a face-centered cubic structure with a pore size of 17 nm and a pore volume of 0.24 cm. 3 / g, the specific surface area is 347m 2 / g, the gold content is 2.5%, and the gold nanometer size is 3 nm, labeled as 2.5Au-SC-17.

[0051] Its characteristic X-ray s...

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Abstract

The invention relates to a large-pore-size mesoporous carbon / silicon dioxide loaded gold nano-catalyst and a synthesis method thereof. The catalyst has a face-centered cubic ordered structure, the specific surface area is 200m<2> / g to 700<2> / g, the pore volume is 0.30cm<3> / g to 0.60cm<3> / g, the pore size is 7.0nm to 20nm, and the mass percent of Au is 0.5% to 2.5%. During preparation, the mesoporous carbon / silicon dioxide loaded gold nano-catalyst is synthesized in one step through mixing a macromolecular surfactant, which serves as a template agent, with a gold source, a carbon source and a silicon source and carrying out solvent-induced volatilization self-assembly. Compared with the prior art, the catalyst provided by the invention has the characteristics of high-ordered mesoscopic structure, adjustable pore size (7.0nm to 20nm), relatively small gold nano particle size (3nm to 5nm), adjustable gold content (0.5wt% to 2.5wt%), and the synthesis method is simple, is low in cost and facilitates the implementation of large-scale production, thereby having very good economic application prospect.

Description

technical field [0001] The invention belongs to the technical field of mesoporous material synthesis, and relates to a catalyst and a synthesis method thereof, in particular to a large-pore mesoporous carbon / silica supported gold nano-catalyst and a synthesis method thereof. Background technique [0002] Ordered mesoporous materials have uniform pore size, high specific surface area and large pore volume, and have broad application prospects in the fields of adsorption, separation, catalysis, and electronic devices. At present, the use of ordered mesoporous materials as supports, such as ordered mesoporous carbon / silica composites, to support metal catalysts and obtain supported metal catalysts has attracted extensive attention of scientists. The uniform mesoporous carrier and the pores with larger size are the monodisperse reaction space, which breaks the pore size limitation of traditional microporous materials. Superior performance. [0003] However, most of the existin...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J35/10B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00B01J23/52B01J35/617B01J35/615B01J35/635B01J35/633B01J35/647
Inventor 陈尚军宋荣荣王亚万颖
Owner SHANGHAI NORMAL UNIVERSITY
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