Abstract
The catalytic properties of H 2-reduced MoO 3 for the isomerization of C 5–C 7 alkanes were compared to those of Pt/HY and Pt/Hβ zeolites. The pentane isomerization activity decreased in the following order: Pt/Hβ>H 2-reduced MoO 3>Pt/HY. In contrast, H 2-reduced MoO 3 exhibited the lowest activity for heptane isomerization among the catalysts tested. H 2-reduced MoO 3 catalyzed the isomerization of heptane more selectively than other catalysts, although no appreciable difference appeared in the selectivity for pentane isomerization. Kinetic parameters on H 2-reduced MoO 3 were identical with those on Pt/zeolites, suggesting that isomerization reactions on H 2-reduced MoO 3 proceeded via the bifunctional mechanism. We suggested from the results of 2-propanol conversion that the low dehydrogenation–hydrogenation activity of H 2-reduced MoO 3 was a reason for its low isomerization activity. Adsorption of heptane was found to be restricted on H 2-reduced MoO 3, leading to the low activity for heptane isomerization.
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