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Seminars Archive

Operando studies of cobalt oxide by NAP-XPS, XAS and IR: Commercial and model catalysts

Günther Rupprechter (Institute of Materials Chemistry, Technische Universität Wien, 1060 Vienna, Austria)
Thu 14 Nov, at 15:30 - Seminar Room T1

Co3O4 is a promising, noble metal-free oxidation catalyst but a better understanding of the active catalyst is required. We have performed operando studies of functioning catalysts by synchrotron-based near atmospheric pressure X-ray photoelectron spectroscopy (NAP-XPS) and X-ray absorption spectroscopy (XAS), complemented by lab-based infrared (FTIR, PM-IRAS). We employed a two-fold approach, using industrial-grade catalysts (commercial Co3O4 and CoO) as well as surface science based planar model catalysts (ultrathin films of Co3O4 and CoO grown in ultrahigh vacuum (UHV) on Ir(100) single crystals). Based on the in situ surface-specific chemical information a complex network of different reaction pathways unfolded.

(Referer: L. Gregoratti)
Ultima modifica il Martedì, 24 Aprile 2012 15:21