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Experiments were carried out following two different O2 exposures at 400 K (10 L and 50 L) and for 10 L of O2 exposure at varying temperatures (Tsurf = 200, 300, and 400 K). for the first time, a clear, one-to-one correlation between size-dependent CO oxidation activity of Pdn/TiO2(110) (n ¡Ü 25) and the Pd electronic structure as probed by X-ray photoemission (XPS).(12) Pd 3d binding energies (BEs) generally decrease with increasing size but fluctuate about this general trend. Clusters with higher-than-trend-BEs (Pd7, Pd4) show low activity, while clusters with high activity (Pd20) have lower-than-trend BEs |
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