Abstract
Abstract The surface area of H2-reduced Pt/MoO3 decreased with increasing the flow rate of H2 in the reduction process at 773 K, while the opposite tendency was observed at 523 and 623 K. The surface area was found to depend on the extent of reduction, which was raised by an increase in the H2 flow rate. The largest surface area, about 300 m2 g-1, was obtained at a reduction degree of 64%. A study of reduction with a mixture of H2 and H2O showed that the extent of reduction declined in the presence of H2O. We suggest from these results that the reduction of Pt/MoO3 was prohibited by the action of H2O produced by the reduction. The pentane isomerization activity of H2-reduced Pt/MoO3 was also dependent on the extent of reduction. The highest isomerization activity was obtained at a reduction degree of 76%. H2-reduced Pt/MoO3 exhibited a comparable catalytic activity for pentane isomerization to Pt/H-mordenite.
Published Version
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