期刊
JOURNAL OF CATALYSIS
卷 340, 期 -, 页码 368-375出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.06.002
关键词
Core-shell; Diffusion; CO oxidation; Kinetic study; Pt@SiO2
资金
- King Abdullah University of Science and Technology (KAUST)
The mechanism of formation of Pt@SiO2 as a model of core-shell nanoparticles via water-in-oil reverse microemulsions was studied in detail. By controlling the time of growth of Pt precursors, Pt(OH)(x), after hydrolysis in NH3 aq. before adding SiO2 precursor (TEOS), Pt nanoparticles with a narrow size distribution were produced, from ultrafine metal nanoparticles (<1 nm) to 6 nm nanocrystals. Separately, the thickness of SiO2 was controllably synthesized from 1 to 15 nm to yield different Pt@SiO2 materials. The Pt@SiO2 core-shell catalysts exhibited a higher rate of CO oxidation by one order of magnitude with a positive order regarding CO pressure. The SiO2 shell did not perturb the Pt chemical nature, but it provided different coverage of CO in steady-state CO oxidation. (C) 2016 Elsevier Inc. All rights reserved.
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