Au, @ZrO₂ yolk-shell catalysts for CO oxidation: Study of particle size effect by ex-post size control of Au cores

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• 作者：Robert Gü ; ttel ; Michael Paul ; Carolina Galeano ; Ferdi Schü ; th ; ^{schueth@kofo.mpg.de}
• 关键词：Yolk&ndash ; shell catalysts ; Gold ; Carbon monoxide oxidation ; Particle size effect ; Nanoparticles
• 刊名：Journal of Catalysis
• 出版年：2012
• 期刊代码：97_00219517
• 类别：ce
• 出版时间：May, 2012
• 卷：289
• 期：Complete
• 页码：100-104
• 文件大小：229 K

摘要

Gold nanoparticles supported on transition metal oxides are found to exhibit a pronounced particle size effect in CO oxidation. However, the preparation of comparable supported gold nanoparticles with different sizes remains challenging, since the catalytic behavior of these materials is very sensitive to the preparation conditions. To overcome this difficulty, Au, @ZrO₂ catalysts with gold core sizes between 5 and 15 nm were prepared by partial leaching of gold in an ex-post manner. The material obtained offers a unique comparability for particle size effect studies in CO oxidation. No effect of gold particle size was observed in the studied size range.