期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 220, 期 -, 页码 506-511出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2017.08.047
关键词
Diesel oxidation catalyst; In-situ; NAP-XPS; Active catalytic; Phase; Platinum
资金
- National Science Foundation Division of Materials Research [NSF-DMR1506989]
- Swedish Energy Agency [37178-1]
- Chemical Sciences, Geosciences and Biosciences Division, Office of Basic Energy Sciences, Office of Science, U.S. Department of Energy [DE-SC0014561]
- U.S. National Science Foundation Career Award [NSF-CHE-1462121]
This study concerns near ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) studies of a Pt/A1203 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 O-2. Such changes in Pt oxidation state have previously been linked to dynamic changes in NO oxidation activity.
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