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In-situ characterization by Near-Ambient Pressure XPS of the catalytically active phase of Pt/Al2O3 during NO and CO oxidation
Princeton University, Science Division, Yale-NUS College, Singapore.
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering. (Process Technology)
University of Kansas. (Department of Chemical and Petroleum Engineering and Department of Chemistry)
Scania CV. (Materials Technology)
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2018 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 220, p. 506-511Article in journal (Refereed) Published
Abstract [en]

This study concerns near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) studies of a Pt/Al2O3 diesel oxidation catalyst used in exhaust aftertreatment. We apply the technique to an industrial-grade porous catalyst, thus bridging both the pressure and materials gap, and probe the shift in binding energy of Pt 4d under different atmospheres. We observe that oxidizing atmospheres induce a shift in binding energy, corresponding to changes in Pt oxidation state, especially pronounced under an atmosphere of NO and O2. Such changes in Pt oxidation state have previously been linked to dynamic changes in NO oxidation activity.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 220, p. 506-511
Keywords [en]
Diesel oxidation catalyst, in-situ, NAP-XPS, active catalytic phase, platinum
National Category
Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-259736DOI: 10.1016/j.apcatb.2017.08.047ISI: 000412957200049OAI: oai:DiVA.org:kth-259736DiVA, id: diva2:1353283
Note

QC 20190923

Available from: 2019-09-22 Created: 2019-09-22 Last updated: 2019-09-23Bibliographically approved

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