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A gold nanocatalyst with multi-level structure and multiple encapsulation and its synthesis method

A synthesis method, gold nanotechnology, applied in chemical instruments and methods, physical/chemical process catalysts, preparation of aminohydroxy compounds, etc., can solve the problems of low stability, poor cyclability, etc., achieve short synthesis cycle, solve easy blockage, Realize the effect of multiple fixed loads

Inactive Publication Date: 2017-10-24
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a gold nanocatalyst with multi-level structure and multiple encapsulation and its synthesis method to solve the problems of low stability and poor cycle performance in traditional nanocatalytic systems

Method used

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  • A gold nanocatalyst with multi-level structure and multiple encapsulation and its synthesis method
  • A gold nanocatalyst with multi-level structure and multiple encapsulation and its synthesis method
  • A gold nanocatalyst with multi-level structure and multiple encapsulation and its synthesis method

Examples

Experimental program
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Embodiment 1

[0030] A kind of synthetic method of the gold nano-catalyst of multiple encapsulation of multilevel structure, comprises the steps:

[0031] (1) Synthesis of mesoporous SiO by sol-gel method 2 Nanospheres: Use 64mL deionized water, 9g ethanol, 10.4g cetyltrimethylammonium chloride aqueous solution with a mass fraction of 25wt%, and 0.2g diethanolamine to mix and add to a 250mL round-bottomed flask. Stir for 30min, add 7.3mL tetraethyl orthosilicate, stir vigorously, the reaction temperature is 60°C, and the reaction time is 2 hours, to obtain mesoporous SiO 2 Nanospheres; then reflux extraction with Soxhlet extractor to remove mesoporous SiO 2 The surfactant contained in the nanospheres, the reflux liquid extracted by the Soxhlet extractor is a mixture of ethanol / concentrated hydrochloric acid with a volume ratio of 3:1, the temperature of reflux extraction is 130°C, and the washing time of reflux extraction is 8h ;

[0032] (2) Preparation of gold nanocluster solution: Dis...

Embodiment 2

[0043] This example is roughly the same as Example 1, except that 40 μL of tetramethyl orthosilicate is used in step 5), and the structure, performance and catalytic stability of the prepared catalyst are similar to those of Example 1.

[0044] The SEM figure of the multi-level structure multiple encapsulation gold nanocatalyst synthesized in this embodiment 2 is shown in Figure 7 ,from Figure 7 It can be seen from the SEM picture of the multi-level structure multi-encapsulation gold nanocatalyst prepared in Example 2 is similar to the material prepared in Example 1, the diameter of the macropore is about 500nm, and the pore wall of the macropore is made of small-sized Composed of small balls, the size of the small balls is uniform, and the size is about 30nm.

Embodiment 3

[0046] This example is roughly the same as Example 1, except that 50 μL of tetramethyl orthosilicate is used in step 2), and the structure, performance and catalytic stability of the prepared catalyst are similar to those of Example 1.

[0047] The SEM figure of the multi-level structure multiple encapsulation gold nanocatalyst synthesized in this embodiment 3 is shown in Figure 8 ,from Figure 8 It can be seen from the SEM picture that the multi-level structure multi-encapsulation gold nanocatalyst prepared in Example 3 is similar to the material prepared in Example 1, the macropores are relatively uniform, the pore diameter is about 500nm, and the pore walls of the macropores are made of Composed of small-sized balls, the size of the balls is uniform, and the size is about 30nm.

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Abstract

The invention belongs to the technical field of catalysis, and in particular relates to a gold nano-catalyst with multi-level structure and multiple encapsulation and a synthesis method thereof. The gold nanocatalyst is synthesized by the following method: first synthesize mesoporous SiO2 nanospheres, gold nanocluster solution and polystyrene bead emulsion respectively; then mesoporous SiO2 nanospheres are dispersed in deionized water, adding excess Gold nanocluster solution, after being fully loaded, the aqueous solution of mesoporous SiO2 beads loaded with gold nanoclusters is obtained; the polystyrene bead emulsion is mixed with the mesoporous SiO2 bead solution loaded with gold nanoclusters, and ultrasonically dispersed into it A silicon source is added, placed in an oven to stand for aging, and then calcined to obtain a gold nano-catalyst with multiple encapsulations in a hierarchical porous structure. The invention realizes the construction of a macroporous-mesoporous multi-stage catalytic system, solves the problems of easy blockage of traditional catalytic carrier materials and easy loss of catalysts, and the synthesis method is simple and easy to operate, and the synthesis period is short.

Description

technical field [0001] The invention belongs to the technical field of porous material synthesis and the technical field of catalysis, and specifically relates to a gold nano-catalyst with multi-level structure and multiple encapsulation and a synthesis method thereof. Background technique [0002] Nanocatalyst refers to a catalyst whose particle size is nanoscale. Due to its unique volume effect, surface effect, quantum size effect and macroscopic quantum tunneling effect, noble metal nanocatalysts have very important applications in the fields of physical chemistry, energy chemical industry, pollution control, etc., and have become a research topic in recent years. hotspot. Because noble metal nanoparticles have a quantum size effect, when the size of the nanoparticles drops to a certain value, the nanoparticles have outstanding optical nonlinearity, specific catalytic activity and other properties, and this effect leads to the smaller the size of the nanocatalyst, the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J35/08B01J35/10C07C215/76C07C213/02
Inventor 阳晓宇耿伟彭春蕾覃宏伟米凯峰苏宝连
Owner WUHAN UNIV OF TECH
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