Skeletal isomerization of n-butane over mordenite and beta zeolites

It was found that the addition of platinum (3 wt.%) substantially increases the total n-butane conversion and selectivity to isobutane over H-Beta zeolite. The same holds for H-Mordenite; however, the conversion significantly decreases in time at 350 degrees C due to the coking of the catalyst. The selectivity to isobutane is the highest at 300 degrees C over both zeolite types with platinum (over Pt/H-Beta 1.8 times higher than over Pt/H-Mordenite at almost the same conversion levels of 30 and 36%, respectively). The I-I-forms of both zeolite types are most selective at 250 degrees C, but the total conversion is low. The results obtained are related to the structural features of both zeolite types.