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Novel method for synthesizing nano-hollow silicon sphere supported noble metal catalyst by micro-emulsion method

A technology of microemulsion method and hollow silicon, which is applied in the field of technology, can solve the problems of low photon quantum efficiency and limited application, and achieve the effect of increasing specific surface area, low investment and easy operation

Inactive Publication Date: 2015-04-08
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, TiO 2 It is a wide bandgap semiconductor, which can only absorb limited ultraviolet light, and the photogenerated electron-hole pairs are easy to recombine, and the photon quantum efficiency is low, which limits its application in the field of photoelectrocatalysis

Method used

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  • Novel method for synthesizing nano-hollow silicon sphere supported noble metal catalyst by micro-emulsion method
  • Novel method for synthesizing nano-hollow silicon sphere supported noble metal catalyst by micro-emulsion method
  • Novel method for synthesizing nano-hollow silicon sphere supported noble metal catalyst by micro-emulsion method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Slowly add 1ml of octylphenol polyoxyethylene ether to 20ml of n-hexane, and stir for 1min at room temperature; add 1ml of n-butanol to the above solution, and stir for 1min at room temperature, at this time a microemulsion system is formed; 0.3 Mix ml butyl silicate and 30ul octadecyltrimethyloxysilane to form a precursor solution, slowly add dropwise to the above solution, stir at room temperature for 3min; add 3ml deionized water dropwise at a speed of 0.5ml / min Add to the above solution, stir at room temperature for 10min; drop 0.03ml of ammonia water into the above solution at a rate of 0.5ml / min, stir at room temperature for 5h, and form organic SiO 2 (o) Ball.

[0052] (2) Add 0.8ml butyl silicate to the above solution, stir at room temperature for 25h to form inorganic SiO 2 Coated organic SiO 2 The structure of the ball is SiO 2 (o)SiO 2 (i) Structure.

[0053] (3) Add 50ml of diacetyl to the above solution, let it stand for 20min to obtain a precipita...

Embodiment 2

[0057] (1) 10ml of high-carbon fatty alcohol polyoxyethylene ether is slowly added to 50ml of n-hexane, and stirred at room temperature for 10min; 10ml of n-octanol is added to the above solution, and stirred at room temperature for 10min, at which point a microemulsion system is formed; 0.3ml ethyl silicate and 30ul hexamethyloxydisilane were mixed uniformly to form a precursor solution, slowly added dropwise to the above solution, and stirred at room temperature for 3 minutes; 1.5ml deionized water was added dropwise to the above mentioned solution, stirred at room temperature for 5 minutes; 0.15ml of ammonia water was added dropwise to the above solution at a rate of 0.75ml / min, and stirred at room temperature for 4 hours to form organic SiO 2 (o) the ball;

[0058] (2) Add 0.8ml ethyl silicate to the above solution, stir at room temperature for 25h to form inorganic SiO 2 Coated organic SiO 2 The structure of the ball is SiO 2 (o)SiO 2 (i) structure;

[0059] (3) Add ...

Embodiment 3

[0063](1) Slowly add 5ml of polyethylene glycol p-isooctylphenyl ether to 50ml of n-hexane, and stir at room temperature for 5 minutes; add 5ml of isooctyl alcohol to the above solution, and stir at room temperature for 5 minutes, at which point a microemulsion is formed system; mix 0.05ml propyl silicate and 5ul methyl diphenyl hydroxyethyl silane evenly to form a precursor solution, slowly add it dropwise to the above solution, stir at room temperature for 1min; mix 0.3ml deionized water at 0.5ml / min Add dropwise to the above solution at a speed of 1, and stir at room temperature for 1 min; add 0.3 ml of ammonia water dropwise to the above solution at a speed of 1 ml / min, and stir at room temperature for 5 h to form organic SiO 2 (o) the ball;

[0064] (2) Add 0.01ml propyl silicate to the above solution, stir at room temperature for 20h to form inorganic SiO 2 Coated organic SiO 2 The structure of the ball is SiO 2 (o)SiO 2 (i) structure;

[0065] (3) Add 10ml of propi...

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Abstract

The invention provides a method for synthesizing a nano-hollow silicon sphere supported noble metal catalyst by a micro-emulsion method. The method comprises the following steps: slowly adding a surfactant A into a solvent B to form a solution C; adding a co-surfactant D into the solution C to form a solution E; uniformly mixing a silicate compound F and a saline reagent G to form a precursor solution, and dropwise adding the precursor solution into the solution E to form a solution H; dropwise adding deionized water into the solution H to form a solution I; dropwise adding ammonia water into the solution I to form a solution J so as to form an organic SiO2(o) sphere; adding a silicate compound K into the solution J to form a solution M so as to form a SiO2(o)@SiO2(i) structure; adding a precipitant N into the solution M, standing to obtain precipitate, washing for 1-2 times with O, and dispersing into the deionized water to form a solution P; etching the SiO2(o) layer by a hydrofluoric acid aqueous solution to obtain an SiO2 hollow sphere, centrifugally washing, and drying; reducing the SiO2 hollow sphere into an Si hollow sphere by magnesium powder; supporting noble metal particles Q to the Si hollow sphere to obtain the nano-hollow silicon sphere supported noble metal effective photo-catalyst, and centrifugally drying.

Description

technical field [0001] The invention belongs to the technical field of technology, and in particular relates to a method for synthesizing a noble metal catalyst supported by nanometer hollow silicon spheres by a novel microemulsion method. Background technique [0002] Energy is crucial to the development of human society. In the situation that fossil energy is about to be exhausted, research on new renewable energy is imminent. Hydrogen energy, as a secondary energy source, has many advantages such as cleanness, high efficiency, safety, storability, and transportability. Pay attention to. Since 1972, two professors from the University of Tokyo first reported TiO 2 The possibility of photocatalytic water splitting to produce hydrogen with single crystal electrodes has opened up the research path of using solar energy to photolyze water to produce hydrogen. The key to hydrogen production by photolysis of water is the choice of catalysts. Now more and more people are focus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/52B01J23/42B01J23/50B01J23/44B01J35/08B01J35/10
Inventor 陈卓籍云方
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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