Effect of Tungsten Oxide Content in Pt/WO3-ZrO2 Catalysts on the Performance Characteristics of the Heptane–Benzene Mixture Hydroisomerization Reaction

The effect of the tungsten oxide content (10–35 wt %) in Pt/WO 3 -ZrO 2 catalysts on hydroisomerization of a heptane–benzene mixture (80 : 20, wt %) has been studied. The catalysts with 15–25 wt % WO 3 are characterized by the highest fraction of the tetragonal phase of zirconia ( t -ZrO 2 , 87–96%), which makes it possible to achieve the highest yield of the sum of heptane isomers, including high-octane di- and trimethyl-substituted isomers (DTMS; 69.4–76.7 and 24.5–27.9 wt %, respectively). In the presence of these catalysts, the yield of methylcyclopentane is 52.1–61.3 wt % at 72.6–90.9% selectivity of isomerization of cyclohexane to methylcyclopentane.