Preparation and investigation of model surfaces for the study of Ziegler-natta catalysis Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/gm80hz15j

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  • 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.
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