Catalytic CO Oxidation over Well-Defined Cobalt Oxide Nanoparticles: Size-Reactivity Correlation

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• 作者：Viacheslav Iablokov ; Roland Barbosa ; Glenn Pollefeyt ; Isabel Van Driessche ; Sergey Chenakin ; Norbert Kruse
• 刊名：ACS Catalysis
• 出版年：2015
• 出版时间：October 2, 2015
• 年：2015
• 卷：5
• 期：10
• 页码：5714-5718
• 全文大小：393K
• ISSN：2155-5435

文摘

Co nanoparticles of well-defined size were synthesized by temperature-controlled injection of Co₂(CO)₈ into dichlorobenzene. After intercalation into mesoporous MCF-17 and temperature-programmed oxidation, Co₃O₄/MCF-17 model catalysts were obtained with cobalt oxide particle sizes varying between 3.5 and 12.2 nm. We demonstrate here the occurrence of a distinct particle size effect for the CO oxidation. Maximum reaction rates of about 0.77 nm^鈥? s^鈥? at 150 掳C were observed for Co₃O₄ particles with a size in the range of 5 to 8 nm. The reaction rates decreased for either smaller or larger sizes. X-ray photoelectron spectroscopy allowed establishing a clear correlation between the Co³⁺ trivalent oxidation state and the CO oxidation rate.