SiO₂–Ag–SiO₂core/shell structure with a high density of Ag nanoparticles for CO oxidation catalysis (original) (raw)

Nanotechnology, 2016

Abstract

SiO2-Ag-SiO2, a sandwiched core/shell structure with a layer of Ag nanoparticles (∼4 nm) encapsulated between a shallow SiO2 surface layer and a SiO2 submicrosphere substrate (∼200 nm), has been synthesized from [Formula: see text] and SiO2 spheres by a facile one-pot hydrothermal method. The composite is proposed to result from the dynamic balance between the [Formula: see text] reduction and the dissolution-redeposition of SiO2 in mild basic media. The synthetic mechanism and the roles of the reaction time, temperature, and the amount of ammonia in the formation of this unique structure are investigated and discussed. The composite structure shows superior catalytic performance in CO oxidation to the control Ag/SiO2 structure prepared by impregnation. Pre-treatment by O2 at 600 °C significantly improves the catalytic performance of the composite structure and preserves the nanocomposite structure well.

Hongmo Li hasn't uploaded this paper.

Let Hongmo know you want this paper to be uploaded.

Ask for this paper to be uploaded.