Journal
ACS CATALYSIS
Volume 5, Issue 10, Pages 5714-5718Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.5b01452
Keywords
particle size effect; cobalt nanoparticles; Co3O4 nanoparticles; catalytic CO oxidation; XPS
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Funding
- Fond National de la Recherche Scientifique (FNRS) of Belgium
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Co nanoparticles of well-defined size were synthesized by temperature-controlled injection of Co-2(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(-2) s(-1) at 150 degrees 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.
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