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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
KTH, School of Chemical Science and Engineering (CHE), Chemical Engineering and Technology.
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2018 (English)In: Applied Catalysis B: Environmental, ISSN 0926-3373, E-ISSN 1873-3883, Vol. 220, 506-511 p.Article 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 B.V. , 2018. Vol. 220, 506-511 p.
Keyword [en]
Active catalytic, Diesel oxidation catalyst, In-situ, NAP-XPS, Phase, Platinum
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-216814DOI: 10.1016/j.apcatb.2017.08.047ISI: 000412957200049Scopus ID: 2-s2.0-85028524837OAI: oai:DiVA.org:kth-216814DiVA: diva2:1162674
Note

Export Date: 24 October 2017; Article; CODEN: ACBEE; Correspondence Address: Bernasek, S.L.; Department of Chemistry, Princeton UniversityUnited States; email: steven.bernasek@yale-nus.edu.sg; Funding details: Energimyndigheten; Funding text: This work was partially supported by the National Science Foundation Division of Materials Research, grant NSF-DMR1506989. The Swedish Energy Agency is gratefully acknowledged for the financial support of the FFI project No 37178-1. Feng Tao acknowledges financial support from the Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy, under Grant No. DE-SC0014561, and U.S. National Science Foundation Career Award NSF-CHE-1462121. QC 20171205

Available from: 2017-12-05 Created: 2017-12-05 Last updated: 2017-12-05Bibliographically approved

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