Low Temperature Physics: 32, 1097 (2006); https://doi.org/10.1063/1.2389021 (7 pages)
Физика Низких Температур: Том 32, Выпуск 11 (Ноябрь 2006), c. 1441-1448 ( к оглавлению , назад )
The polymerization of acetylene on supported metal clusters
S. Gilb, M. Arenz, and U. Heiz
Technische Universitüt München, Lehrstuhl für Physikalische Chemie Lichtenbergstr. 4, 85747 Garching, Germany
Received May 29, 2006, revised August 29, 2006
The polymerization of acetylene was studied by thermal programmed reaction on model catalysts consisting of size-selected Ag, Rh, and Pd atoms and Pdn (1 ≤ n ≤ 30) clusters on well-characterized MgO(111) thin films. In a single-pass heating cycle experiment, benzene,
butadiene, and butane were catalyzed with different selectivities as function of cluster size: palladium and rhodium atoms selectively produce benzene, and the highest selectivity for butadiene is observed for Pd6, whereas Pd20 reveals the highest selectivity for butane. Ag atoms are inert. These results provide an atom-by-atom observation of the selectivity of small cluster catalysts.
Ключевые слова: small clusters catalysts, cyclotrimerization reaction, Ag, Rh, and Pd atoms, dependent reactivity, polymerization selectivity.