Projects per year
Abstract
Single-atom catalysts are potentially ideal model systems to investigate structure-function relationships in catalysis if the active sites can be uniquely determined. In this work, we study the interaction of C2H4 with a model Rh/Fe3O4(001) catalyst that features 2-, 5-, and 6-fold coordinated Rh adatoms, as well as Rh clusters. Using multiple surface-sensitive techniques in combination with calculations of density functional theory (DFT), we follow the thermal evolution of the system and disentangle the behavior of the different species. C2H4 adsorption is strongest at the 2-fold coordinated Rh1 with a DFT-determined adsorption energy of −2.26 eV. However, desorption occurs at lower temperatures than expected because the Rh migrates into substitutional sites within the support, where the molecule is more weakly bound. The adsorption energy at the 5-fold coordinated Rh sites is predicated to be −1.49 eV, but the superposition of this signal with that from small Rh clusters and additional heterogeneity leads to a broad C2H4 desorption shoulder in TPD above room temperature.
Original language | English |
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Pages (from-to) | 15404-15411 |
Number of pages | 8 |
Journal | Journal of Physical Chemistry C |
Volume | 128 |
Issue number | 37 |
DOIs | |
Publication status | Published - 19 Sep 2024 |
Austrian Fields of Science 2012
- 103020 Surface physics
- 103043 Computational physics
- 104017 Physical chemistry
Projects
- 1 Active
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TACO: Taming Complexity in Materials Modeling
Diebold, U., Kresse, G., Mezger-Backus, E. H. G., Dellago, C. & Franchini, C.
1/03/21 → 28/02/25
Project: Research funding