Single crystal surfaces can be used as substitutes or
models for the actual reactive surfaces of heterogeneous
catalysts. The advantage in using such models is that the
reaction of interest can be isolated on the particular
face of the crystal that is thought to be catalytically
active. A variety of ordered chlorine covered Ti surfaces
were prepared which should be useful as model surfaces for
studying Ziegler-Natta reactions. These include a
chlorine covered Ti(100) surface on which a 4x6 LEED
pattern was observed and a chlorine covered Ti(001)
surface, on which a chlorine coincidence lattice was
formed.
The reactivity of clean and partially chlorine
covered Ti(001) and (100) surfaces toward ethylene was
also studied. During the investigation of ethylene uptake
an epitaxial layer of TiC(lll) was produced on the clean
Ti(001) surface. Ethylene uptake curves and carbon
segregation to the chlorine covered crystal face are
reported for various fractional chlorine coverages.
Sulfur segregation from the bulk, to the surface of a
Ti single crystal was studied and ordered LEED patterns
recorded on ,both the Ti(001) and Ti(100) surfaces. The
sulfur covered surfaces were in turn used in additional
experiments designed to investigate the uptake of chlorine
and the thermal desorption of chlorine from a sulfur
covered surface. / Graduation date: 1991
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/37473 |
| Date | 10 August 1990 |
| Creators | Mischenko, John |
| Contributors | Watson, Philip R. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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