High-temperature catalytic transformations of 1-isopropyl-4-methylcyclohexane in presence of hydrogen under pressure

Summary

• 1. At 450° in presence of hydrogen at 20 atm the transformations of 1-isopropyl-4-methylcyclohexane over platinized alumina (0.5% Pt) result in the formation of 1,3-dimethylcyclopentane, methylcyclohexane, toluene, p-cymene, and a mixture of ethylxylenes.

• 2. In presence of platinised zirconia (0.5% Pt) the main reaction in the transformations of 1-isopropyl-4-methylcyclohexane is its dehydrogenation to p-cymene. Its dealkylation to methylcyclohexane and toluene proceeds only to a very slight extent.

• 3. A catalyst containing 0.5% of platinum on zirconium dioxide, while active for the dehydrogenation of a cyclohexane ring, has scarcely any cracking power.