Steps and catalytic reactions: CO oxidation with preadsorbed O on Rh(553)

SURFACE SCIENCE

卷:715

Article

Zhang, Chu¹  Wang, Baochang²  Hellman, Anders²  Shipilin, Mikhail³  Merte, Lindsay R.⁴  Blomberg, Sara⁵  Wang, Xueting^6,7  Carlsson, Per-Anders^6,7  Lundgren, Edvin¹  Weissenrieder, Jonas⁸  Resta, Andrea⁹  Mikkelsen, Anders¹  Andersen, Jesper N.¹  Gustafson, Johan¹ 

[1] Lund Univ, Synchrotron Radiat Res, Box 118, S-22100 Lund, Sweden

[2] Chalmers Univ Technol, Dept Phys, S-41296 Gothenburg, Sweden

[3] Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, S-10691 Stockholm, Sweden

[4] Malmo Univ, Mat Sci & Appl Math, S-20506 Malmo, Sweden

[5] Lund Univ, Dept Chem Engn, Box 124, S-22100 Lund, Sweden

[6] Chalmers Univ Technol, Dept Chem & Chem Engn, S-41296 Gothenburg, Sweden

[7] Chalmers Univ Technol, Competence Ctr Catalysis, S-41296 Gothenburg, Sweden

[8] KTH Royal Inst Technol, Dept Appl Phys, Mat & Nano Phys, S-10044 Stockholm, Sweden

[9] Synchrotron SOLEIL, St Aubin, State Two, France

关键词: Rhodium;    Steps;    Catalysis;    CO Oxidation;    X-Ray photoelectron spectroscopy;    Density functional theory;   

DOI  :  10.1016/j.susc.2021.121928

来源: Elsevier

【 摘 要 】

Industrial catalysts are often comprised of nanoparticles supported on high-surface-area oxides, in order to maximise the catalytically active surface area and thereby utilise the active material better. These nanoparticles expose steps and corners that, due to low coordination to neighboring atoms, are more reactive and, as a consequence, are often assumed to have higher catalytic activity. We have investigated the reaction between CO and preadsorbed O on a stepped Rh(553) surface, and show that CO oxidation indeed occurs faster than on the flat Rh(111) surface at the same temperature. However, we do find that this is not a result of reactions at the step sites but rather at the terrace sites close to the steps, due to in-plane relaxation enabled by the step. This insight can provide ways to optimize the shape of the nanoparticles to further improve the activity of certain reactions.

【 授权许可】

Free