Abstract
The catalytic properties of H2-reduced MoO3 with noble metals for the conversions of pentane and propan-2-ol were studied. No appreciable difference appeared in the pentane isomerization activity and in the propan-2-ol dehydration activity among Pt, Pd, Rh, and Ir/MoO3 catalysts after reduction at 773 K for 12 h. H2-Reduced Ru/MoO3 exhibited lower isomerization and dehydration activities than the other catalysts. The isomerization and the dehydration activities of H2-reduced Ru/MoO3 was improved by an increase in the amount of Ru loading, while those of H2-reduced Pt/MoO3 changed very little. XRD and TPR studies showed that the reduction process of Ru/MoO3 varied with the amount of Ru. By contrast, reduction of Pt/MoO3 involved the formation of a hydrogen molybdenum bronze, HxMoO3, irrespective of the amount of Pt. We suggest from these results that reduction of HxMoO3 can yield the active phase for pentane isomerization and for propan-2-ol dehydration.
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