Dehydration of 2-propanol was carried out at 398 K using molybdenum ox
ides as a catalyst. The parent MoO3 exhibited a low activity. H-2 redu
ction at 623 K increased the dehydration activity. After the reduction
for 4 h, the MoO3 became more active than USY zeolites, although the
catalytic activity of MoO3 declined with time on stream. We suggest th
at the acidity of MoO3 was enhanced by H-2 reduction at 623 K.