| Type of Document |
Dissertation |
| Author |
St. Clair, Todd P.
|
| Author's Email Address |
tstclair@vt.edu |
| URN |
etd-51898-10285 |
| Title |
Characterization and Reactivity of Mo2C |
| Degree |
PhD |
| Department |
Chemical Engineering |
| Advisory Committee |
| Advisor Name |
Title |
| Cox, David F. |
Committee Chair |
| Dillard, John G. |
Committee Member |
| Hanson, Brian E. |
Committee Member |
| Hochella, Michael F. Jr. |
Committee Member |
| Oyama, Shigeo Ted |
Committee Member |
|
| Keywords |
- single crystal molybdenum carbide
- thiophene desulfurization
|
| Date of Defense |
1998-06-04 |
| Availability |
restricted |
Abstract
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).
|
| Files |
| Filename |
Size |
Approximate Download Time
(Hours:Minutes:Seconds)
|
| 28.8 Modem |
56K Modem |
ISDN (64 Kb) |
ISDN (128 Kb) |
Higher-speed Access |
![[VT]](http://scholar.lib.vt.edu/images/ETD-db/restricted.gif) |
diss.PDF |
1.13 Mb |
00:05:13 |
00:02:41 |
00:02:21 |
00:01:10 |
00:00:06 |
indicates that a file or directory is
accessible from the Virginia Tech campus network only.
|
