Pd-Ga model SCALMS: Characterization and stability of Pd single atom sites

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Kettner M, Maisel S, Stumm C, Schwarz M, Schuschke C, Görling A, Libuda J
Zeitschrift: Journal of Catalysis
Jahr der Veröffentlichung: 2019
Band: 369
Seitenbereich: 33-46
ISSN: 0021-9517


Abstract

We have prepared model systems for Pd-Ga supported catalytically active liquid metal solutions (SCALMS) by physical vapor deposition of Pd and Ga in ultrahigh vacuum onto highly oriented pyrolytic graphite (HOPG) pre-modified by Ar+ bombardment. Combining AFM and IRAS with CO as a probe molecule, we investigate the growth behavior, the morphology, the surface chemistry, and the stability of Pd-Ga alloys on HOPG.
Our results prove the single atom character of the active sites in Ga-rich Pd-Ga alloys. We show that upon interaction with CO, Ga is displaced from the surface and CO adsorbs in on-top position on surface Pd atoms. Experimental data on the vibrational frequencies and binding energies of CO are compared to the results of DFT calculations for CO adsorption on four different Pd-Ga models, i.e. PdGa(1 0 0), PdGa( 1 1 1), Pd-doped \textgreeka-Ga(0 0 1), and Pd-doped fcc-Ga(1 0 0). The comparison suggests that widely separated Pd sites are formed in the Ga matrix.


FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Görling, Andreas Prof. Dr.
Lehrstuhl für Theoretische Chemie
Kettner, Miroslav, Ph.D.
Lehrstuhl für Katalytische Grenzflächenforschung
Libuda, Jörg Prof. Dr.
Professur für Physikalische Chemie
Maisel, Sven
Lehrstuhl für Theoretische Chemie
Schuschke, Christian
Lehrstuhl für Physikalische Chemie II
Schwarz, Matthias
Lehrstuhl für Physikalische Chemie II
Stumm, Corinna
Lehrstuhl für Physikalische Chemie II


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Forschungsbereiche

D Catalytic Materials
Exzellenz-Cluster Engineering of Advanced Materials
A3 Multiscale Modeling and Simulation
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Kettner, M., Maisel, S., Stumm, C., Schwarz, M., Schuschke, C., Görling, A., & Libuda, J. (2019). Pd-Ga model SCALMS: Characterization and stability of Pd single atom sites. Journal of Catalysis, 369, 33-46. https://dx.doi.org/10.1016/j.jcat.2018.10.027

MLA:
Kettner, Miroslav, et al. "Pd-Ga model SCALMS: Characterization and stability of Pd single atom sites." Journal of Catalysis 369 (2019): 33-46.

BibTeX: 

Zuletzt aktualisiert 2019-09-04 um 12:01