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Transition of Surface Phase of Cobalt Oxide during CO Oxidation

Abstract

In situ/operando studies of a heterogeneous catalyst under reaction condition and during catalysis are particularly valuable in fundamental understanding of catalytic mechanism at a molecular level through establishing a correlation between observed catalytic performance and its corresponding surface chemistry during catalysis. Here CO oxidation on cobalt oxides was studied with ambient pressure X-ray photoelectron spectroscopy (AP-XPS). During CO oxidation on CoO in the temperature range of 140-180oC, the active surface phase CoO progressively transforms to Co3O4. Kinetic studies of CO oxidation on surface phase CoO at 80-120oC and on the formed Co3O4 at 160-220oC show that CoO and Co3O4 exhibit different activation barriers, 49.3 kJ/mol for CoO and 36.9 kJ/mol for Co3O4. This study illustrated the transition of active surface phase of a transition metal oxide-based catalyst under a catalytic condition although its bulk phase could remain no change.

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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, Accepted Manuscript
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    Transition of Surface Phase of Cobalt Oxide during CO Oxidation

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

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