Journal
ACS CATALYSIS
Volume 1, Issue 6, Pages 629-635Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs200092c
Keywords
platinum; propane oxidation; SrTiO3; atomic layer deposition; nanocrystal support; nanoparticle catalysis
Categories
Funding
- U.S. Department of Energy, Office of Basic Energy Science through the Institute for Catalysis in Energy Processes [W-31-109-ENG-38, DE-FG02-03-ER15457]
- NSF-NSEC
- NSF-MRSEC
- Keck Foundation
- State of Illinois
- Northwestern University
- U.S. Department of Energy, Office of Science Laboratory under UChicago Argonne, LLC. [DE-AC02-06CH11357]
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Pt/SrTiO3 shows promise as a low temperature using sol-precipitation coupled with hydrothermal synthesis, hydrocarbon combustion catalyst for automotive applications. In this study, SrTiO3 nanocuboid supports were synthesized 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 rim in size, depending upon the number of ALD cycles. These materials have a >50 degrees 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.
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