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Probing the Oxidation/Reduction Dynamics of Fresh and P-, Na-, and K-Contaminated Pt/Pd/Al2O3 Diesel Oxidation Catalysts by STEM, TPR, and in Situ XANES
Yale NUS Coll, Sci Div, Singapore 138529, Singapore.;Princeton Univ, Dept Chem, Princeton, NJ 08540 USA..
KTH, School of Engineering Sciences in Chemistry, Biotechnology and Health (CBH), Chemical Engineering, Chemical Technology.
ASTAR, ICES, Singapore Synchrotron Light Source, Singapore 117603, Singapore..
ASTAR, ICES, Singapore Synchrotron Light Source, Singapore 117603, Singapore..
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2020 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 124, no 5, p. 2945-2952Article in journal (Refereed) Published
Abstract [en]

This study examines the oxidation and reduction behavior of Pt/Pd/Al2O3 diesel oxidation catalysts at temperatures and gas compositions that model the conditions of the working diesel oxidation catalyst in a truck exhaust system. In situ measurements using Pt L-3 X-ray edge absorption spectroscopy are coupled with temperature-programmed reduction (TPR) and scanning transmission electron microscopy measurements to characterize the catalyst. The fresh catalyst is compared with chemically aged catalysts, exposed to Na, K, and P contaminants. Phosphorus exhibits strong, spatially localized interactions with the Pt/Pd catalyst nanoparticles that are reflected in a strong shift to lower energy of the Pt L-3 edge under CO oxidation conditions. The Na and K poisons are spread more uniformly throughout the catalyst washcoat and do not strongly affect the edge spectra or the TPR-determined catalyst reducibility.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2020. Vol. 124, no 5, p. 2945-2952
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Physical Chemistry
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URN: urn:nbn:se:kth:diva-269037DOI: 10.1021/acs.jpcc.9b07655ISI: 000512222000022Scopus ID: 2-s2.0-85079736963OAI: oai:DiVA.org:kth-269037DiVA, id: diva2:1413780
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QC 20200311

Available from: 2020-03-11 Created: 2020-03-11 Last updated: 2020-03-11Bibliographically approved

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Granestrand, JonasKienkas, LienePettersson, Lars

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