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Nat Commun. 2014 Sep 15;5:4885. doi: 10.1038/ncomms5885.

Low-temperature carbon monoxide oxidation catalysed by regenerable atomically dispersed palladium on alumina.

Author information

1
Department of Chemical and Biological Engineering and Center for Microengineered Materials, University of New Mexico, MSC 01 1120, Albuquerque, New Mexico 87131, USA.
2
Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, China.
3
Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA.
4
Chemical Science and Engineering, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
5
1] Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, USA [2].
6
Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
7
Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003, USA.
8
Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
9
School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.

Abstract

Catalysis by single isolated atoms of precious metals has attracted much recent interest, as it promises the ultimate in atom efficiency. Most previous reports are on reducible oxide supports. Here we show that isolated palladium atoms can be catalytically active on industrially relevant γ-alumina supports. The addition of lanthanum oxide to the alumina, long known for its ability to improve alumina stability, is found to also help in the stabilization of isolated palladium atoms. Aberration-corrected scanning transmission electron microscopy and operando X-ray absorption spectroscopy confirm the presence of intermingled palladium and lanthanum on the γ-alumina surface. Carbon monoxide oxidation reactivity measurements show onset of catalytic activity at 40 °C. The catalyst activity can be regenerated by oxidation at 700 °C in air. The high-temperature stability and regenerability of these ionic palladium species make this catalyst system of potential interest for low-temperature exhaust treatment catalysts.

PMID:
25222116
DOI:
10.1038/ncomms5885

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