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Sandwich-like hollow structure metal oxide noble metal nanoparticle metal oxide catalyst, preparation method and use thereof

A nanoparticle, hollow structure technology, applied in the field of hollow MOMMO catalysts, can solve the problems of difficult to control etching rate, local shell etching, grain shell cracking and other problems, achieve excellent catalytic performance, overcome calcination and alkali etching , the effect of excellent activity and stability

Active Publication Date: 2016-03-30
THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, currently using SiO 2 The preparation of hollow structure metal oxides by the template method usually involves a multi-step process of "sol-gel, calcination and alkali etching", and the process is relatively cumbersome
Moreover, high temperature calcination crystallizes the amorphous metal oxide shell will be accompanied by the fusion growth of grains and the local shell cracking when the crystal phase is formed; and the use of NaOH solution to etch SiO 2 It is difficult to control the etching rate of the template, causing the local shell to be etched, and a certain amount of by-products and waste liquid are generated at the same time

Method used

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  • Sandwich-like hollow structure metal oxide noble metal nanoparticle metal oxide catalyst, preparation method and use thereof
  • Sandwich-like hollow structure metal oxide noble metal nanoparticle metal oxide catalyst, preparation method and use thereof
  • Sandwich-like hollow structure metal oxide noble metal nanoparticle metal oxide catalyst, preparation method and use thereof

Examples

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Effect test

Embodiment 1

[0098] Example 1: Synthesis of gold nanoparticles

[0099] 0.85 mL of 10 mM HAuCl 4 Mix well with 0.32mL sodium citrate with a concentration of 25mM in a round bottom flask, then add ultrapure water to a solution volume of 40mL. Then, 1.05 mL of sodium borohydride with a concentration of 0.1 M was added to the above solution and magnetically stirred at 15° C. for 3 hours to obtain gold nanoparticles with a particle size of 1.3 nm.

Embodiment 2

[0100] Example 2: Synthesis of gold nanoparticles

[0101] 0.85 mL of 10 mM HAuCl 4 Mix well with 0.32mL sodium citrate with a concentration of 25mM in a round bottom flask, then add ultrapure water to a solution volume of 40mL. Then, 1.05 mL of sodium borohydride with a concentration of 0.1 M was added to the above solution and magnetically stirred at 30° C. for 8 hours to obtain gold nanoparticles with a particle size of 1.8 nm.

Embodiment 3

[0102] Example 3: Synthesis of gold nanoparticles

[0103] 0.85 mL of 10 mM HAuCl 4 Mix well with 0.32mL sodium citrate with a concentration of 25mM in a round bottom flask, then add ultrapure water to a solution volume of 40mL. Then 1.05 mL of sodium borohydride with a concentration of 0.1 M was added to the above solution and magnetically stirred at 45° C. for 12 hours to obtain gold nanoparticles with a particle size of 2.1 nm.

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Abstract

The invention discloses a sandwich-like hollow structure metal oxide noble metal nanoparticle metal oxide catalyst, a preparation method and its use. The present invention adopts a combination of sol-gel and hydrothermal methods. First, the sol-gel method is used to prepare a spherical SiO2 template with uniform size, and then the surface is coated with a metal oxide shell layer, and then the precious metal nanoparticles are adsorbed to the surface through electrostatic interaction. The surface of the shell is then coated with another layer of metal oxide shell using the sol-gel method, and finally the hydrothermal method is used to achieve crystallization of the amorphous metal oxide shell and removal of the SiO2 template, thereby obtaining a similar Sandwich hollow structure catalyst. The present invention uses a hydrothermal method to replace the existing "high-temperature calcination and alkali etching" method. It has the characteristics of simple operation, high yield and good monodispersity. The prepared sandwich-like hollow structure material exhibits excellent performance in catalytic reactions. activity and stability.

Description

technical field [0001] The invention relates to a simple and general method for preparing a metal oxide catalyst with a hollow structure metal oxide noble metal nanoparticle with high yield and good monodispersity, in particular to a hollow MOMMO (M is Au, Pt or Pd nanoparticle, MO is TiO 2 , ZrO 2 , CuO, ZnO or CeO 2 )catalyst. Background technique [0002] Noble metal-metal oxide composite nanomaterials have shown superior performance in the fields of catalytic oxidation and hydrogenation due to their special properties, showing potential application value (ACSCatal., 2013, 3, 61-73). At the same time, noble metal-metal oxide hybrid nanomaterials are structurally tunable, which can satisfy people's design, tailoring and optimization of their structure and performance at the nanoscale, and help to explore the size, composition, structure and The internal interaction law between performance. That is to say, the construction of noble metal-metal oxide composites and the e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/52B01J23/42B01J23/44B01J35/02B01J13/02B82Y30/00B82Y40/00C01B3/04C01B31/20B01J35/00C01B32/50
CPCY02E60/36
Inventor 李国栋唐智勇王大为陈杰
Owner THE NAT CENT FOR NANOSCI & TECH NCNST OF CHINA
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