Autori: G. Kummerlöwe, I. Balteanu, Z. Sun, O. P. Balaj, V. E. Bondybey, and M. K. Beyer
Editorial: Int. J. Mass Spectrom., 254, p.183-188, 2006.
Bimolecular reactions of cationic platinum clusters Pt(n)+, n = 1–24, and anionic platinum clusters Pt(n)−, n = 3–22, with CH(4) and CD(4) are studied under low pressure conditions in an FT-ICR mass spectrometer, using an isotopically enriched 195Pt sample. Strongly size-dependent dehydrogenation and formation of Pt(n)CH(2)+/− is observed for both charge states. Starting with n = 12, cationic clusters also afford stabilization of a [Pt(n), CH(4)]+ adduct, presumably the HPt(n)CH(3)+ insertion compound. Deuteration shifts the lower limit for adduct formation to n = 8. It is suggested that the strong reactivity fluctuations over a wide size range are the gas phase fingerprint of a good heterogeneous catalyst material.
Cuvinte cheie: Catalysis, Platinum, C–H activation, Methane, Dehydrogenation kinetics