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The Synthesis of SiO 2 @AuAg@CeO 2 Sandwich Structures with Enhanced Catalytic Performance Towards CO Oxidation
Author(s) -
Yang Hongxiao,
Liu Wei,
Wang Zhaohui,
Sun Guoxin
Publication year - 2019
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201901792
Subject(s) - bimetallic strip , catalysis , materials science , chemical engineering , nanoparticle , transmission electron microscopy , adsorption , thermal stability , nanotechnology , chemistry , organic chemistry , engineering
Novel sandwich structure SiO 2 @AuAg@CeO 2 nanospheres (SACs), as low‐temperature CO oxidation catalysts, were designed and prepared in this work. The SACs include SiO 2 nanosphere support, embedded bimetallic AuAg nanoparticles, and CeO 2 shell. The transmission electron microscope (TEM), elemental mapping images, and ultraviolet‐visible (UV‐vis) spectroscopy indicated the successful fabrication of the SACs sandwich structure. The catalytic performance of SACs varies with the AuAg composition and achieves the best catalytic activity when Au/Ag atomic ratio is 2:1. The strong synergistic effect of AuAg alloy remarkably promotes the CO oxidation through facilitating the adsorption of CO and O 2 on the AuAg nanoparticles. The CeO 2 non‐compact shell not only provides effective protection for AuAg nanoparticles from aggregation but also gives CO full access to the catalysts. With unique sandwich structure and specific chemical composition, the SiO 2 @Au 2 Ag 1 @CeO 2 nanospheres with CeO 2 shell thickness of 5 nm present excellent low‐temperature catalytic activity and high‐temperature thermal stability.