Design of a core–shell Pt–SiO₂ catalyst in a reverse microemulsion system: Distinctive kinetics on CO oxidation at low temperature
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Date
2016
Publication Type
Journal Article, Journal Article
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no
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Abstract
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.
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published
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Journal / series
Volume
340
Pages / Article No.
368 - 375
Publisher
Elsevier
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Subject
Core–shell; Diffusion; CO oxidation; Kinetic study; Pt@SiO2
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02293 - Catalysis Hub / Catalysis Hub