title: Low-temperature carbon monoxide oxidation catalysed by regenerable atomically dispersed palladium on alumina.
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.
authors.affiliation: Department of Chemical and Biological Engineering and Center for Microengineered Materials, University of New Mexico, MSC 01 1120, Albuquerque, New Mexico 87131, USA.
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Peterson
authors.affiliation: Department of Chemical and Biological Engineering and Center for Microengineered Materials, University of New Mexico, MSC 01 1120, Albuquerque, New Mexico 87131, USA.
authors.forename: Andrew T
authors.initials: AT
authors.lastname: DeLaRiva
authors.affiliation: Research Institute of Photocatalysis, State Key Laboratory of Photocatalysis on Energy and Environment, Fuzhou University, Fuzhou 350002, China.
authors.forename: Sen
authors.initials: S
authors.lastname: Lin
authors.affiliation: Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA.
authors.forename: Ryan S
authors.initials: RS
authors.lastname: Johnson
authors.affiliation: Department of Chemistry and Chemical Biology, University of New Mexico, Albuquerque, New Mexico 87131, USA.
authors.forename: Hua
authors.initials: H
authors.lastname: Guo
authors.affiliation: Chemical Science and Engineering, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, Illinois 60439, USA.
authors.forename: Jeffrey T
authors.initials: JT
authors.lastname: Miller
authors.affiliation: 1] Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, USA [2].
authors.forename: Ja
authors.initials: J
authors.lastname: Hun Kwak
authors.affiliation: Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, USA.
authors.forename: Charles H F
authors.initials: CH
authors.lastname: Peden
authors.affiliation: Department of Physics, New Mexico State University, Las Cruces, New Mexico 88003, USA.
authors.forename: Boris
authors.initials: B
authors.lastname: Kiefer
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: Lawrence F
authors.initials: LF
authors.lastname: Allard
authors.affiliation: School of Chemical Engineering, Purdue University, West Lafayette, Indiana 47907, USA.
authors.forename: Fabio H
authors.initials: FH
authors.lastname: Ribeiro
authors.affiliation: Department of Chemical and Biological Engineering and Center for Microengineered Materials, University of New Mexico, MSC 01 1120, Albuquerque, New Mexico 87131, USA.
authors.forename: Abhaya K
authors.initials: AK
authors.lastname: Datye