Characterization and Reactivity of Mo2C
St. Clair, Todd P.
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Two types of Mo2C have been investigated: polycrystalline beta-Mo2C and single crystal alpha-Mo2C. The beta-Mo2C material was synthesized via a temperature-programmed method, and then characterized using x-ray diffraction (XRD), x-ray photoelectron spectroscopy (XPS), CO chemisorption, and N2 physisorption. The catalytic activity of the beta-Mo2C was tested for cumene hydrogenation under high pressure conditions, and the effect of sulfur and oxygen poisons on cumene hydrogenation was also investigated. As a complement to the work done on polycrystalline beta-Mo2C, UHV studies of single crystal alpha-Mo2C were undertaken to provide fundamental information about a well-characterized Mo2C surface. The (0001) surface of alpha-Mo2C was investigated using XPS and low energy electron diffraction (LEED). It was found that an ion-bombarded surface could be prepared as either Mo-terminated or C-terminated by choosing either low annealing temperatures (~1000 K) or high annealing temperatures (~1500 K), respectively. CO and O2 adsorption was also studied on alpha-Mo2C (0001) using thermal desorption spectroscopy (TDS), XPS, Auger electron spectroscopy (AES), and LEED. Finally, thiophene adsorption was investigated on alpha-Mo2C (0001).
- Doctoral Dissertations