Sandwich-like hollow structure metallic oxide @ noble metal nanoparticles @ metallic oxide catalyst as well as preparation method and use thereof

Abstract

The invention discloses a sandwich-like hollow structure metallic oxide @ noble metal nanoparticles @ metallic oxide catalyst as well as a preparation method and the use of the sandwich-like hollow structure metallic oxide @ noble metal nanoparticle @ metallic oxide catalyst. The method combines a sol-gel method and a hydrothermal method, and comprises the steps of preparing a spherical SO2 template with uniform size by the sol-gel method; then, coating a metallic oxide shell layer on the surface of the spherical SO2 template, adsorbing noble metal nanoparticles to the surface of the shell layer by electrostatic action, and further coating another metallic oxide shell layer on the surface of the spherical SO2 template by the sol-gel method; finally, carrying out crystallization on the amorphous metallic oxide shell layers and removing the SO2 template by adopting the hydrothermal method to obtain the sandwich-like hollow structure catalyst. The existing 'high-temperature calcination and alkali etching' method is replaced by the hydrothermal method; the method has the characteristics of being simple in operation, high in yield and good in monodispersity; the prepared sandwich-like hollow structure material is excellent in activity and stability in a catalytic reaction.

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 (ACS Catal., 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 ...

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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

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