Title:
Partial Oxidation of Methanol on Gold: How Selectivity Is Steered by Low-Coordinated Sites
Author(s):
Eltayeb, Salma; Carroll, Lenard L.; Dippel, Lukas; Mostaghimi, Mersad; Riedel, Wiebke; Moskaleva, Lyudmila V.; Risse, Thomas
Year of publication:
2024
Available Date:
2024-05-30T08:15:04Z
Abstract:
Partial methanol oxidation proceeds with high selectivity to methyl formate (MeFo) on nanoporous gold (npAu) catalysts. As low-coordinated sites on npAu were suggested to affect the selectivity, we experimentally investigated their role in the isothermal selectivity for flat Au(111) and stepped Au(332) model surfaces using a molecular beam approach under well-defined conditions. Direct comparison shows that steps enhance desired MeFo formation and lower undesired overoxidation. DFT calculations reveal differences in oxygen distribution that enhance the barriers to overoxidation at steps. Thus, these results provide an atomic-level understanding of factors controlling the complex reaction network on gold catalysts, such as npAu.
Part of Identifier:
e-ISSN (online): 2155-5435
Keywords:
gold
methanol
oxidation
Au(111)
Au(332)
low-coordinated sites
DDC-Classification:
540 Chemie und zugeordnete Wissenschaften
Publication Type:
Wissenschaftlicher Artikel
URL of the Original Publication:
DOI of the Original Publication:
Journaltitle:
ACS Catalysis
Department/institution:
Biologie, Chemie, Pharmazie
Institut für Chemie und Biochemie
Comments:
Die Publikation wurde aus Open Access Publikationsgeldern der Freien Universität Berlin gefördert.