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説明:

Steric effects in O2 chemisorption and catalytic CO oxidation on stepped Pt(111) surfaces have been investigated by scanning a narrow alignment-controlled O2 beam across a curved Pt(111) surface, on which the densities of \{100\} (A-type) and \{111\} (B-type) steps vary smoothly with the distance from the center of the crystal. The contribution of trapping-mediated and activated chemisorption to these processes on the terraces and steps were discussed based on the dependence of these processes on the kinetic energy (80-500 meV) and alignment of O2. The results indicate that (i)the probability of activated O2 chemisorption on surfaces with type-B steps is slightly lower than that on surfaces with type-A steps, (ii) CO oxidation proceeds both at terraces and steps at the sample temperature of 693 K while it happens only at terraces at 423 K. The results of CO oxidation experiments at 423 K indicate that the rate of CO2 production at terraces of the stepped Pt(111) surface is lower than at a flat (111) surface and depends on the step structure.

権利情報:

• Creative Commons BY-NC Attribution-NonCommercial 4.0 International
  

キーワード: molecular oxygen , platinum, step, alignment, CO oxidation

刊行年月日: 2024-12-19

出版者: American Chemical Society (ACS)

掲載誌:

• The Journal of Physical Chemistry C (ISSN: 19327447) vol. 128 issue. 50 p. 21430-21437

研究助成金:

• Japan Society for the Promotion of Science 20H02623
• Japan Society for the Promotion of Science 24K01349
• Iketani Science and Technology Foundation 0361245-A

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5191

公開URL: https://doi.org/10.1021/acs.jpcc.4c06503

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更新時刻: 2025-12-06 12:30:27 +0900

MDRでの公開時刻: 2025-12-06 08:33:58 +0900