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Transition of surface phase of cobalt oxide during CO oxidation

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Abstract

In situ/operando studies of a heterogeneous catalyst are particularly valuable for achieving a fundamental understanding of catalytic mechanisms at a molecular level by establishing a correlation between the observed catalytic performance and the corresponding surface chemistry during catalysis. Herein, CO oxidation on cobalt oxides was studied via ambient pressure X-ray photoelectron spectroscopy (AP-XPS). During CO oxidation on CoO in the temperature range of 140–180 °C, the active surface phase of CoO progressively transforms to Co3O4. Kinetic studies of CO oxidation on the surface phase CoO at 80–120 °C and on the formed Co3O4 at 160–220 °C show that CoO and Co3O4 exhibit different activation barriers: 49.3 kJ mol−1 for CoO and 36.9 kJ mol−1 for Co3O4. This study demonstrates the transition of the active surface phase of a transition metal oxide-based catalyst under catalytic conditions with no change in the bulk phase of the catalyst.

Graphical abstract: Transition of surface phase of cobalt oxide during CO oxidation

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Publication details

The article was received on 01 Nov 2017, accepted on 24 Dec 2017 and first published on 02 Jan 2018


Article type: Paper
DOI: 10.1039/C7CP07407G
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Transition of surface phase of cobalt oxide during CO oxidation

    Y. Tang, L. Ma, J. Dou, C. M. Andolina, Y. Li, H. Ma, S. D. House, X. Zhang, J. Yang and F. (. Tao, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C7CP07407G

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