Isomerization of Hexane and Heptane Mixtures in the Presence of Platinum-Containing Tungstated Zirconia Catalysts

The isomerization of heptane and hexane and their mixtures in the presence of Pt/WO 3 –ZrO 2 catalysts with a tungsten oxide content of 10–35 wt % has been studied. It has been shown that the best parameters of the isomerization of a mixture of C 6 –C 7 alkanes are achieved in the presence of catalysts containing 15–20 wt % WO 3 . According to temperature-programmed desorption of ammonia, this range of tungsten oxide content is characterized by an increase in the number of acid sites, which, according to IR spectroscopy of adsorbed CO molecules, occurs mostly due to an increase in the number of Brønsted acid sites.