Title page for ETD etd-11012008-063455

Type of Document Master's Thesis
Author Lucy, Toby E.
URN etd-11012008-063455
Title Synthesis, characterization and reactivity of tungsten oxynitride
Degree Master of Science
Department Chemical Engineering
Advisory Committee
Advisor Name Title
Oyama, Shigeo Ted Committee Chair
Cox, David F. Committee Member
Davis, Richey M. Committee Member
  • reactivity
  • synthesis
  • catalysis
  • tungsten nitride
  • TPR
Date of Defense 1996-08-30
Availability restricted

High surface area tungsten oxynitride samples have been prepared by the temperature programmed reaction (TPR) of W03 with NH3. All samples were characterized by X-ray diffraction (XRD), nitrogen physisorption, and CO chemisorption. In addition, some sample compositions were determined by elemental analysis. Samples were prepared at various heating rates (β), allowing a Redhead analysis to be carried out giving an activation energy of nitridation of 109 kJ mol-1. A heating rate of 0.016 K S-1 gave optimum synthesis conditions. Solid state intermediates were studied by interruption of the temperature program at various stages. No distinct suboxide phases formed along the synthesis path were found using XRD. An increase in surface area, CO uptake and nitrogen weight content, were found to occur as the reaction progressed. Reactivity experiments showed reasonable hydro deoxygenation (HDO) and hydrodenitrogenation (HDN) activities, but little hydrogenation (HYD) or hydrodesulfurization (HDS) activities.

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