Abstract
ESR studies on ZrO 2-supported Mo oxide catalysts indicate the presence of two types of paramagnetic Mo 5+ species on the support surface. The oxygen uptake capacities (at -78;°C), as well as the hydrodesulfurization and hydrogenation activities of the catalysts are found to correlate with the Mo loadings on the support. The results are explained with the help of a “patch” model of the Mo oxide phase.
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