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Title: Thermally stable single-atom platinum-on-ceria catalysts via atom trapping

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:
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Publication Date:
OSTI Identifier:
1290385
Report Number(s):
PNNL-SA--119148
Journal ID: ISSN 0036-8075; KC0302010
DOE Contract Number:
AC05-76RL01830; FG02-05ER15712; EEC-0813570
Resource Type:
Journal Article
Resource Relation:
Journal Name: Science; Journal Volume: 353; Journal Issue: 6295
Publisher:
AAAS
Research Org:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English