Chemistry Department Colloquium

"High-energy resolution x-ray emission spectroscopy for catalysis and materials chemistry"

Presented by Olga Safonova, Swiss Light Source & Energy Dept. at Paul Scherrer Institute, Switzerland

Friday, April 13, 2012, 11:00 am — Hamilton Seminar Room, Bldg. 555

New possibilities of high-energy-resolution x-ray emission spectroscopy for structural studies catalysts and applied materials will be discussed and compared to traditional XAS. Based on selected examples it will be shown how improvement of energy resolution of XANES, chemical sensitivity of emission lines and resonance inelastic X-ray scattering (RIXS) can help answering difficult scientific questions.

Interests are focused on the understanding of structure-function relations in heterogeneous catalysis and material science. The highlights include (i) probing of geometry of CO adsorption sites and reactivity on platinum and gold nanoparticles using HERFD XAS at the Pt and Au L3 edges, (ii) application of valence-to-core XES to study the local structure of Cr, Fe, Co and Ni in amorphous metal coatings, and to prove the formation of V-N bonds in V/Al2O3 catalyst for selective propane ammoxidation , (iii) developing of an in situ reactor for the study of the mechanism of deactivation of cobalt and iron Fischer-Tropsch catalysts under conditions mimicking the industrial applications at high pressures using in situ XRD combined with XAS at Co K- Fe K- and Pt K-edges.

Hosted by: Dario Stacchiola

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