Anisotropic EPR and ENDOR studies of sulfur-containing heterocyclic compounds adsorbed on silica-alumina surfaces
Youn, Dennis James
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https://hdl.handle.net/2142/19506
Description
Title
Anisotropic EPR and ENDOR studies of sulfur-containing heterocyclic compounds adsorbed on silica-alumina surfaces
Author(s)
Youn, Dennis James
Issue Date
1989
Doctoral Committee Chair(s)
Belford, R. Linn
Department of Study
Chemistry
Discipline
Chemistry
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Physical
Language
eng
Abstract
The physical phenomenon of an organic molecule adsorbing onto a silica-alumina surface is a topic of great interest. Many questions concerning exactly how this phenomenon occurs still remain unanswered. Although Electron Paramagnetic Resonance and Electron-Nuclear Double Resonance techniques are sensitive to the radical species that are often produced upon adsorption of these molecules onto these surfaces, the analysis is very difficult and forbidding. Anisotropic interactions that are present in these systems makes characterization of the experimental spectra a very challenging problem. It is possible, however, to obtain crucial information about the interaction between the molecule and the catalyst surface through the analysis of these complex spectra. This thesis examines and analyzes an adsorbate/catalyst system with special qualities which are of interest to high-sulfur coal researchers. It also presents a general method which was developed to perform the analysis of spectra of highly anisotropic systems correctly.
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