期刊
JOURNAL OF CATALYSIS
卷 273, 期 2, 页码 125-137出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2010.05.005
关键词
Doped metal oxide; Methane activation; Dry reforming
资金
- US Department of Energy [DE-FG02-89ER140482008]
- NSF-MRSEC [DMR05-20415]
- NSF [CHE 07-49489]
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- University of California [GCP-128649]
We have studied catalytic activity of Pt-doped CeO2 for the oxidation and the dry reforming of methane. The catalyst was prepared by three methods resulting in ceria containing different ratios of ionic Pt versus Pt. We show that these materials have different catalytic activity for methane oxidation and dry reforming and that they are more active when the fraction of ionic Pt is increased. Density functional theory was used to help understand the role of Pt dopant. It was found that the presence of Pt activates the oxygen atoms next to it in the surface layer and this decreases the activation energy for dissociative adsorption of methane (which is the rate-limiting step in the reaction). (C) 2010 Elsevier Inc. All rights reserved.
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