Acetylene Cyclotrimerization on Supported Size-Selected PdnClusters (1 ≤n≤ 30): One Atom Is Enough!
Journal of the American Chemical Society2000Vol. 122(14), pp. 3453–3457
Citations Over TimeTop 1% of 2000 papers
Stéphane Abbet, A. Sanchez, Ueli Heiz, Wolf‐Dieter Schneider, Anna Maria Ferrari, Gianfranco Pacchioni, Notker Rösch
Abstract
We studied the cyclotrimerization of acetylene on size-selected Pdn clusters (1 ≤ n ≤ 30) supported on thin MgO(100) films by thermal desorption and Fourier transform infrared spectroscopy. Surprisingly, the production of benzene is already observed on a single palladium atom at low temperature (300 K). Using density functional theory (DFT) calculations we show that free inert Pd atoms are activated by charge transfer from defect sites of the MgO substrate upon deposition. For larger clusters (7 ≤ n ≤ 30) benzene is additionally produced at a temperature of 430 K and our results suggest the existence of a critical ensemble of seven palladium atoms for this high-temperature reaction mechanism.
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