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Catalysts Examined by Electron Spin Resonance-Examples from Hydrodesulfurization Catalysis

Published online by Cambridge University Press:  15 February 2011

Bernard G. Silbernagel
Bernard G. Silbernagel*
Affiliation:
Corporate Research-Science Laboratories, Exxon Research and Engineering Co., Linden, New Jersey 07036
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Abstract

The utility of electron spin resonance (ESR) for catalyst characterization is illustrated for the desulfurization catalysts used to remove sulfur, nitrogen, and organically bound metals from petroleum. These catalysts consist of active metals (Mo, W, Co, Ni) in mixed oxide and sulfide phases on high surface area alumina supports. Coordinated studies of unsupported sulfide and oxide model systems determine the chemical form and number of defect sites on the actual catalysts. Parallel catalysis studies correlate ESR defects and catalytic activity for many reactions.

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