Type of Document Dissertation Author York, Steven C. Author's Email Address firstname.lastname@example.org URN etd-082199-084653 Title Halocarbon Reactions on the Chromium (III) Oxide (1012) Surface 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 Marand, Eva Committee Member Oyama, Shigeo Ted Committee Member Keywords
- oxygen adsorption
- chromium oxide
- single crystal
Date of Defense 1999-08-13 Availability restricted AbstractA nearly stoichiometric, (1x1) Cr2O3 (1012) surface
was prepared from a single crystal of alpha-Cr2O3.
The five-coordinate cations exposed at the stoichiometric
surface dissociatively adsorb molecular oxygen to
form a (1x1), terminating chromyl (Cr=O) layer
that is stable to >1100 K. TDS and AES were used
to investigate the reactivity of the halo-alkanes
CFCl2CH2Cl, CF2ClCH2Cl, CF3CH2Cl, and CF2CH2F, in
addition to the halo-alkenes CFCl=CH2 and CF2=CH2.
The halo-alkanes CFCl2CH2Cl, CF2ClCH2Cl, and CF3CH2Cl
undergo 1,2-dihalo elimination similar to the Zn-catalyzed
dehalogenation of vicinal dihalides to form alkenes.
Some acetylene is also formed. The halo-alkenes
CFCl=CH2 and CF2=CH2 decompose to yield acetylene.
Halogen removed from the molecules remains bound
to the surface following TDS experiments and
eventually terminates the surface chemistry due
to site blocking of the cations. Reactivity is
directly related to the chlorine content of the
molecules investigated. Only CFCl2CH2Cl was
reactive on a chromyl-terminated surface.
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