Journal
ACS CATALYSIS
Volume 11, Issue 22, Pages 13935-13946Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acscatal.1c04214
Keywords
platinum; manganese oxide; atomic layer deposition; overcoating layer; undercoating layer; CO oxidation
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Funding
- Korea Institute of Energy Technology Evaluation and Planning (KETEP)
- Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea [20194030202360]
- Department of Energy, Office of Basic Energy Sciences, Chemical Sciences, Geosciences and Biosciences Division [DE-FG02-13ER16380]
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The influence of manganese oxide on CO oxidation over Pt catalysts was investigated. MnOx modification improved catalyst durability and CO oxidation rates by creating active Pt-MnOx interfacial sites. Despite suppressed CO adsorption after high-temperature calcination, TEM showed uniform coverage of Pt by a thin film of MnOx.
The influence of manganese oxide on CO oxidation over Pt was investigated. Pt/Al2O3 catalysts were modified by the atomic layer deposition (ALD) of MnOx with deposition before or after addition of Pt, and the results were compared to those with an unmodified Pt/Al2O3 catalyst. The addition of MnOx improved the catalyst durability, mitigating the agglomeration of Pt particles after thermal aging at 1073 K. The addition of MnOx also promoted CO oxidation rates by creating active Pt-MnOx interfacial sites despite the fact that CO adsorption was suppressed after high-temperature calcination. Transmission electron microscopy (TEM) showed that Pt was uniformly covered by a thin film of MnOx after calcination. The implications of these results with regard to understanding the MnOx promotion of Pt catalysts are discussed.
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