Oxide thin films and bimetallic model catalysts have been studied using metastable
impact electron spectroscopy (MIES), ultraviolet photoelectron spectroscopy (UPS), low
energy ion scattering spectroscopy (LEISS), X – ray photoelectron spectroscopy (XPS),
low energy electron diffraction (LEED), infrared reflection absorption spectroscopy
(IRAS) and temperature programmed desorption (TPD) under ultra high vacuum (UHV)
conditions. Of particular interest in this investigation was the characterization of the
surface morphology and electronic/geometric structure of the following catalysts:
SiO2/Mo(112), Ag/SiO2/Mo(112), Au–Pd/Mo(110), Au–Pd/SiO2/Mo(110), and Pd–
Sn/Rh(100). Specifically, different types of oxide surface defects were directly
identified by MIES. The interaction of metal clusters (Ag) with defects was examined
by work function measurements. On various Pd related bimetallic alloy surfaces, CO
chemisorption behavior was addressed by IRAS and TPD. Observed changes in the
surface chemical properties during the CO adsorption-desorption processes were
explained in terms of ensemble and ligand effects. The prospects of translating this molecular-level information into fundamental understanding of ‘real world’ catalysts are
discussed.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-1058 |
| Date | 15 May 2009 |
| Creators | Wei, Tao |
| Contributors | Goodman, D. Wayne |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Dissertation, text |
| Format | electronic, application/pdf, born digital |
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