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Issue 3, 2011
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The role of low-coordinate oxygen on Co3O4(110) in catalyticCO oxidation

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Abstract

A complete catalytic cycle for carbon monoxide (CO) oxidation to carbon dioxide (CO2) by molecular oxygen on the Co3O4(110) surface was obtained by density functional theory plus the on-site Coulomb repulsion (DFT + U). Previously observed high activity of Co3O4 to catalytically oxidize CO at very low temperatures is explained by a unique twofold-coordinate oxygen site on Co3O4(110). The CO molecule extracts this oxygen with a computed barrier of 27 kJ/mol. The extraction leads to CO2 formation and an oxygen vacancy on Co3O4(110). Then, the O2 molecule dissociates without a barrier between two neighboring oxygen vacancies (which are shown to have high surface mobility), thereby replenishing the twofold-coordinate oxygen sites on the surface and enabling the catalytic cycle. In contrast, extracting the threefold-coordinate oxygen site on Co3O4(110) has a higher barrier. Our work furnishes a molecular-level mechanism of Co3O4's catalytic power, which may help understand previous experimental results and oxidation catalysis by transition metal oxides.

Graphical abstract: The role of low-coordinate oxygen on Co3O4(110) in catalyticCO oxidation

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Publication details

The article was received on 09 Jul 2010, accepted on 27 Sep 2010 and first published on 09 Nov 2010


Article type: Paper
DOI: 10.1039/C0CP01138J
Citation: Phys. Chem. Chem. Phys., 2011,13, 978-984
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    The role of low-coordinate oxygen on Co3O4(110) in catalyticCO oxidation

    D. Jiang and S. Dai, Phys. Chem. Chem. Phys., 2011, 13, 978
    DOI: 10.1039/C0CP01138J

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