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

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Abstract
SiO 2 –Ag–SiO 2 , a sandwiched core/shell structure with a layer of Ag nanoparticles (∼4 nm) encapsulated between a shallow SiO 2 surface layer and a SiO 2 submicrosphere substrate (∼200 nm), has been synthesized from Ag ( NH 3 ) 2 + and SiO 2 spheres by a facile one-pot hydrothermal method. The composite is proposed to result from the dynamic balance between the Ag ( NH 3 ) 2 + reduction and the dissolution-redeposition of SiO 2 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/SiO 2 structure prepared by impregnation. Pre-treatment by O 2 at 600 °C significantly improves the catalytic performance of the composite structure and preserves the nanocomposite structure well.
Funding Information
  • the Third Phase of 211 Project for Advanced Materials Science (WS3116205007)
  • Materials Genome Initiative Center, Shanghai Jiao Tong University
  • National Natural Science Foundation of China (51302169)

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