Aromatization and isomerization of n-hexane catalyzed by Pt/zeolite were investigated. For Pt/K-beta and Pt/K-mordenite as well as for Pt/K-L, the addition of KCl resulted in an increase in selectivity for benzene formation accompanied with a decrease in selectivity for hydroisomerization. A parallelism was found between changes in the benzene selectivity with the KCl addition and in the terminal cracking index. The treatment of Pt/K-FSM-16 with K2CO3 resulted in a decrease in cracking products and an increase in benzene selectivity. At 523 K, Pt/H-FSM-16 catalyst showed high selectivity for methylcyclopentane and cyclohexane. At 623 K, it showed high and durable isomerization activity.