Oxidative Dehydrogenation of Cyclohexane by Cu vs Pd Clusters: Selectivity Control by Specific Cluster Dynamics

0523057 - ÚFCH JH 2021 RIV DE eng J - Journal Article
Halder, A. - Ha, M.-A. - Zhai, H. - Yang, B. - Pellin, M. J. - Seifert, S. - Alexandrova, A. N. - Vajda, Štefan
Oxidative Dehydrogenation of Cyclohexane by Cu vs Pd Clusters: Selectivity Control by Specific Cluster Dynamics.
ChemCatChem. Roč. 12, JAN 2020 (2020), s. 1307-1315. ISSN 1867-3880. E-ISSN 1867-3899
EU Projects: European Commission(XE) 810310
Institutional support: RVO:61388955
Keywords : size * catalysts * reactivity * ensemble * ethylene * route * tio2 * cluster dynamics * cyclohexane oxidative dehydrogenation * deposited clusters * selectivity control * size-selected subnanometer clusters
OECD category: Physical chemistry
Impact factor: 5.686, year: 2020
Method of publishing: Open access

Supported subnanometer clusters can exhibit catalytic properties not observed in their bulk analogues. Partially-oxidized Pd and Cu clusters are reported to catalyze the oxidative dehydrogenation of cyclohexane with high activity, and with distinctly different selectivity, producing primarily benzene or cyclohexene, respectively. Under the appliedreaction conditions, the structure and oxidation state of the two catalysts evolve differently, which leads to either the desorption of the cyclohexene intermediate or to its deeper dehydrogenation. Under the applied reaction conditions, the initially oxidized Pd and Cu clusters undergo partial reduction, which we show to be required for the selectivity to emerge. Both systems also have thermal access to multiple distinct structural forms yielding statistical ensembles. The structures within these ensembles evolve with the changing nature of the bound reaction intermediates differently for the two metals. The evolution is found pronounced in the Cu clusters, but only modest in Pd. Ultimately, the different selectivity observed experimentally for the Cu versus Pd clusters is controlled by differences in the collective structural and redox dynamics of their ensembles.
Permanent Link: http://hdl.handle.net/11104/0307465