Atom by atom built subnanometer copper cluster catalyst for the highly selective oxidative dehydrogenation of cyclohexene

0556027 - ÚFCH JH 2023 RIV US eng J - Journal Article
Valtera, Stanislav - Jašík, Juraj - Vaidulych, Mykhailo - Olszówka, Joanna Elżbieta - Zlámalová, Magda - Tarábková, Hana - Kavan, Ladislav - Vajda, Štefan
Atom by atom built subnanometer copper cluster catalyst for the highly selective oxidative dehydrogenation of cyclohexene.
Journal of Chemical Physics. Roč. 156, č. 11 (2022), č. článku 114302. ISSN 0021-9606. E-ISSN 1089-7690
EU Projects: European Commission(XE) 810310 - J. Heyrovsky Chair
Institutional support: RVO:61388955
Keywords : cyclic hydrocarbons * thin films * hydrogenation
OECD category: Physical chemistry
Impact factor: 4.4, year: 2022
Method of publishing: Open access

The effect of particle size and support on the catalytic performance of supported subnanometer copper clusters was investigated in the oxidative dehydrogenation of cyclohexene. From among the investigated seven size-selected subnanometer copper particles between a single atom and clusters containing 2–7 atoms, the highest activity was observed for the titania-supported copper tetramer with 100% selectivity toward benzene production and being about an order of magnitude more active than not only all the other investigated cluster sizes on the same support but also the same tetramer on the other supports, Al2O3, SiO2, and SnO2. In addition to the profound effect of cluster size on activity and with Cu4 outstanding from the studied series, Cu4 clusters supported on SiO2 provide an example of tuning selectivity through support effects when this particular catalyst also produces cyclohexadiene with about 30% selectivity. Titania-supported Cu5 and Cu7 clusters supported on TiO2 produce a high fraction of cyclohexadiene in contrast to their neighbors, while Cu4 and Cu6 solely produce benzene without any combustion, thus representing odd–even oscillation of selectivity with the number of atoms in the cluster.
Permanent Link: http://hdl.handle.net/11104/0330392