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Theses/Dissertations

Chemical engineering

1991

Petroleum Engineering

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Reduced Molybdenum Oxidation States In Hydrodesulfurization Catalysis By Chevrel Phases , Mark Eugene Ekman Jan 1991

Reduced Molybdenum Oxidation States In Hydrodesulfurization Catalysis By Chevrel Phases , Mark Eugene Ekman

Retrospective Theses and Dissertations

The catalytic activities of reduced (relative to Mo[superscript]4+) molybdenum sulfides, known as Chevrel phases, have been evaluated for thiophene and benzothiophene hydrodesulfurization (HDS) and 1-butene hydrogenation (HYD). These materials have been found to have HDS activities comparable to, or greater than, model unpromoted and cobalt-promoted MoS[subscript]2 catalysts; in contrast, Chevrel phases exhibit low activities for 1-butene HYD;X-ray powder diffraction and laser Raman spectroscopy analysis of the used (10 hours of thiophene reaction) catalysts indicated that the bulk structures were stable under reaction conditions. XPS analysis demonstrated that reduced molybdenum oxidation states were present at the ...