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On the catalytic activity of Co3O4 in low-temperature CO oxidation
Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
Chalmers University of Technology.
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2002 (English)In: Journal of Catalysis, ISSN 0021-9517, E-ISSN 1090-2694, Vol. 211, no 2, 387-397 p.Article in journal (Refereed) Published
Abstract [en]

Oxidation of CO over Co3O4 at ambient temperature was studied with flow reactor experiments, and in-situ spectroscopic and structural methods. The catalyst deactivates during the reaction. The rate of deactivation increased with increasing CO or CO2 gas-phase concentration but decreased with increased 02 concentration or increased temperature. Regeneration of the catalyst in 10% O-2/Ar was more efficient than regeneration in Ar alone. The presence of carbonates and surface carbon on the deactivated catalyst was concluded from TPO experiments. None of these species could, however, be correlated with the deactivation of the catalyst. In-situ FTIR showed the presence of surface carbonates, carbonyl, and oxygen species. The change in structure and oxidation state of the catalyst was studied by in-situ XRD, in-situ XANES, XPS, and flow reactor experiments. One possible explanation for the deactivation of the catalyst is a surface reconstruction hindering the redox cycle of the reaction. (C) 2002 Elsevier Science (USA).

Place, publisher, year, edition, pages
2002. Vol. 211, no 2, 387-397 p.
Keyword [en]
cobalt oxide, CO oxidation, in-situ FTIR, in-situ XRD, in-situ XANES, XPS, low-temperature activity, catalyst deactivation
National Category
Other Chemistry Topics
Research subject
Chemistry with specialization in Chemical Physics
Identifiers
URN: urn:nbn:se:uu:diva-235925DOI: 10.1006/jcat.2002.3738ISI: 000178793400011OAI: oai:DiVA.org:uu-235925DiVA: diva2:762444
Available from: 2014-11-11 Created: 2014-11-11 Last updated: 2017-12-05

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Österlund, Lars

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