1. Propane Oxidation over Pt/SrTiO3 Nanocuboids
- Author
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Laurence D. Marks, Kenneth R. Poeppelmeier, Worajit Setthapun, Christopher L. Marshall, Steven T. Christensen, Federico A. Rabuffetti, James A. Enterkin, Jeffrey W. Elam, and Peter C. Stair
- Subjects
chemistry.chemical_classification ,Materials science ,Inorganic chemistry ,chemistry.chemical_element ,General Chemistry ,Combustion ,Epitaxy ,Catalysis ,Atomic layer deposition ,chemistry.chemical_compound ,Hydrocarbon ,Chemical engineering ,chemistry ,Propane ,Hydrothermal synthesis ,Platinum - Abstract
Pt/SrTiO3 shows promise as a low temperature hydrocarbon combustion catalyst for automotive applications. In this study, SrTiO3 nanocuboid supports were synthesized using sol-precipitation coupled with hydrothermal synthesis, and platinum was deposited on the nanocuboids with 1, 3, and 5 cycles of atomic layer deposition (ALD). The platinum particles have a highly uniform distribution both before and after reaction testing, and range from 1 to 5 nm in size, depending upon the number of ALD cycles. These materials have a >50 °C lower light-off temperature for propane oxidation than a conventional Pt/Al2O3 catalyst, turn over frequencies up to 3 orders of magnitude higher, and show improved resistance to deactivation. The increased activity is attributed to the stabilization of a Pt/PtO core/shell structure during operating conditions by the strong epitaxy between the Pt and the SrTiO3 support.
- Published
- 2011
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