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Memory-dictated dynamics of single-atom Pt on CeO 2 for CO oxidation.

Authors :: Zhang Z
Tian J
Lu Y
Yang S
Jiang D
Huang W
Li Y
Hong J
Hoffman AS
Bare SR
Engelhard MH
Datye AK
Wang Y
Source :: Nature communications [Nat Commun] 2023 May 09; Vol. 14 (1), pp. 2664. Date of Electronic Publication: 2023 May 09.
Publication Year :: 2023
Abstract: Single atoms of platinum group metals on CeO <subscript>2</subscript> represent a potential approach to lower precious metal requirements for automobile exhaust treatment catalysts. Here we show the dynamic evolution of two types of single-atom Pt (Pt <subscript>1</subscript> ) on CeO <subscript>2</subscript> , i.e., adsorbed Pt <subscript>1</subscript> in Pt/CeO <subscript>2</subscript> and square planar Pt <subscript>1</subscript> in Pt <subscript>AT</subscript> CeO <subscript>2</subscript> , fabricated at 500 °C and by atom-trapping method at 800 °C, respectively. Adsorbed Pt <subscript>1</subscript> in Pt/CeO <subscript>2</subscript> is mobile with the in situ formation of few-atom Pt clusters during CO oxidation, contributing to high reactivity with near-zero reaction order in CO. In contrast, square planar Pt <subscript>1</subscript> in Pt <subscript>AT</subscript> CeO <subscript>2</subscript> is strongly anchored to the support during CO oxidation leading to relatively low reactivity with a positive reaction order in CO. Reduction of both Pt/CeO <subscript>2</subscript> and Pt <subscript>AT</subscript> CeO <subscript>2</subscript> in CO transforms Pt <subscript>1</subscript> to Pt nanoparticles. However, both catalysts retain the memory of their initial Pt <subscript>1</subscript> state after reoxidative treatments, which illustrates the importance of the initial single-atom structure in practical applications.<br /> (© 2023. The Author(s).)