Activation of surface lattice oxygen in single-atom Pt/CeO2 for low-temperature CO oxidation

Lei Nie; Donghai Mei; Haifeng Xiong; Bo Peng; Zhibo Ren; Xavier Isidro Pereira Hernandez; Andrew DeLaRiva; Meng Wang; Mark H Engelhard; Libor Kovarik; Abhaya K Datye; Yong Wang

doi:10.1126/science.aao2109

Activation of surface lattice oxygen in single-atom Pt/CeO₂ for low-temperature CO oxidation

Science. 2017 Dec 15;358(6369):1419-1423. doi: 10.1126/science.aao2109.

Authors

Lei Nie¹, Donghai Mei¹, Haifeng Xiong², Bo Peng¹, Zhibo Ren^{1

3}, Xavier Isidro Pereira Hernandez⁴, Andrew DeLaRiva², Meng Wang¹, Mark H Engelhard¹, Libor Kovarik¹, Abhaya K Datye⁵, Yong Wang^{1

4}

Affiliations

¹ Institute for Integrated Catalysis and Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Post Office Box 999, Richland, WA 99352, USA.
² Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA.
³ State Key Laboratory of Chemical Resources Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
⁴ The Gene and Linda Voiland School of Chemical Engineering and Bioengineering, Washington State University, Pullman, WA 99164, USA.
⁵ Department of Chemical and Biological Engineering and Center for Micro-Engineered Materials, University of New Mexico, Albuquerque, NM 87131, USA. datye@unm.edu yong.wang@pnnl.gov.

PMID: 29242344
DOI: 10.1126/science.aao2109

Abstract

To improve fuel efficiency, advanced combustion engines are being designed to minimize the amount of heat wasted in the exhaust. Hence, future generations of catalysts must perform at temperatures that are 100°C lower than current exhaust-treatment catalysts. Achieving low-temperature activity, while surviving the harsh conditions encountered at high engine loads, remains a formidable challenge. In this study, we demonstrate how atomically dispersed ionic platinum (Pt²⁺) on ceria (CeO₂), which is already thermally stable, can be activated via steam treatment (at 750°C) to simultaneously achieve the goals of low-temperature carbon monoxide (CO) oxidation activity while providing outstanding hydrothermal stability. A new type of active site is created on CeO₂ in the vicinity of Pt²⁺, which provides the improved reactivity. These active sites are stable up to 800°C in oxidizing environments.

Publication types

Research Support, Non-U.S. Gov't
Research Support, U.S. Gov't, Non-P.H.S.