title: Thermally stable single-atom platinum-on-ceria catalysts via atom trapping.
abstract: Catalysts based on single atoms of scarce precious metals can lead to more efficient use through enhanced reactivity and selectivity. However, single atoms on catalyst supports can be mobile and aggregate into nanoparticles when heated at elevated temperatures. High temperatures are detrimental to catalyst performance unless these mobile atoms can be trapped. We used ceria powders having similar surface areas but different exposed surface facets. When mixed with a platinum/aluminum oxide catalyst and aged in air at 800°C, the platinum transferred to the ceria and was trapped. Polyhedral ceria and nanorods were more effective than ceria cubes at anchoring the platinum. Performing synthesis at high temperatures ensures that only the most stable binding sites are occupied, yielding a sinter-resistant, atomically dispersed catalyst.
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: John
authors.initials: J
authors.lastname: Jones
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Haifeng
authors.initials: H
authors.lastname: Xiong
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Andrew T
authors.initials: AT
authors.lastname: DeLaRiva
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Peterson
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Hien
authors.initials: H
authors.lastname: Pham
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
authors.forename: Sivakumar R
authors.initials: SR
authors.lastname: Challa
authors.affiliation: General Motors Global R&D, 30500 Mound Road, Warren, MI 48090, USA.
authors.forename: Gongshin
authors.initials: G
authors.lastname: Qi
authors.affiliation: General Motors Global R&D, 30500 Mound Road, Warren, MI 48090, USA.
authors.forename: Se
authors.initials: S
authors.lastname: Oh
authors.affiliation: General Motors Global R&D, 30500 Mound Road, Warren, MI 48090, USA.
authors.forename: Michelle H
authors.initials: MH
authors.lastname: Wiebenga
authors.affiliation: Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA.
authors.forename: Xavier Isidro
authors.initials: XI
authors.lastname: Pereira Hernández
authors.affiliation: Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA. Institute for Integrated Catalysis, Pacific Northwest National Laboratory, Richland, WA 99354, USA.
authors.forename: Yong
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA. datye@unm.edu.
authors.forename: Abhaya K
authors.initials: AK
authors.lastname: Datye