Manganese Oxide Overlayers Promote CO Oxidation on Pt,ACS Catalysis

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Manganese Oxide Overlayers Promote CO Oxidation on Pt
ACS Catalysis ( IF 11.3 ) Pub Date : 2021-11-02 , DOI: 10.1021/acscatal.1c04214
Siwon Lee _{1,

2} , Chao Lin ₂ , Seunghyun Kim ₁ , Xinyu Mao ₂ , Taeho Kim _{3,

4} , Sang-Joon Kim _{3,

4} , Raymond J. Gorte ₂ , WooChul Jung ₁

Affiliation

The influence of manganese oxide on CO oxidation over Pt was investigated. Pt/Al₂O₃ catalysts were modified by the atomic layer deposition (ALD) of MnO_x with deposition before or after addition of Pt, and the results were compared to those with an unmodified Pt/Al₂O₃ catalyst. The addition of MnO_x improved the catalyst durability, mitigating the agglomeration of Pt particles after thermal aging at 1073 K. The addition of MnO_x also promoted CO oxidation rates by creating active Pt–MnO_x 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 MnO_x after calcination. The implications of these results with regard to understanding the MnO_x promotion of Pt catalysts are discussed.

中文翻译：

氧化锰覆盖层促进 Pt 上的 CO 氧化

研究了锰氧化物对 Pt 上 CO 氧化的影响。Pt/Al ₂ O ₃催化剂通过MnO _x原子层沉积(ALD) 改性，在添加Pt 之前或之后进行沉积，并将结果与未改性Pt/Al ₂ O ₃催化剂的结果进行比较。MnO _{x 的添加}提高了催化剂的耐久性，在 1073 K 热老化后减轻了 Pt 颗粒的团聚。MnO _{x 的添加}还通过产生活性 Pt-MnO _x提高了 CO 氧化速率尽管在高温煅烧后抑制了 CO 吸附，但界面位点仍然存在。透射电子显微镜 (TEM) 显示 Pt在煅烧后被MnO _x薄膜均匀覆盖。讨论了这些结果对理解Pt 催化剂的 MnO _x促进作用的影响。

更新日期：2021-11-19

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