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O: Oberflächenphysik
O 40: Adsorption an Oberfl
ächen IV
O 40.1: Vortrag
Dienstag, 8. März 2005, 10:45–11:00, TU EB202
CO adsorption on Ag and Co nanoparticles monitored by SFG and TDS — •Frank Höbel, Günther Rupprechter, and Hans-Joachim Freund — Fritz-Haber-Institut, Faradayweg 4-6, 14195 Berlin
CO adsorption on Al2O3 supported Ag nanoparticles and Nb2O5 supported Co nanoparticles was studied by sum frequency generation (SFG) vibrational spectroscopy from ultrahigh vacuum (UHV) to 100 mbar, at temperatures from 90 K to 450 K. Under UHV conditions CO binding energies and coverages were examined by thermal desorption spectroscopy (TDS).
Under UHV CO adsorbs on silver only at temperatures below 60 K. Adsorption studies at higher temperature therefore require higher gas pressure, e.g. terminal CO was detected at 50 mbar and 150 K. Results of CO adsorption on a Co-Nb2O5 Fischer-Tropsch model catalyst under reaction conditions will be presented.