The transformation of n-alkanes on H-forms of zeolites under supercritical conditionsстатья
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Дата последнего поиска статьи во внешних источниках: 29 ноября 2015 г.
Аннотация:The skeleton isomerization of n-butane, n-hexane, and n-heptane was studied under supercritical conditions on H-forms of zeolites mordenite, beta, and ZSM-5 over the temperature and pressure ranges 260-450A degrees C and 80-130 atm. The isomerization of n-hexane and n-heptane was accompanied by side processes such as oligomerization and cracking. The selectivity of formation of branched isomers of these hydrocarbons did not exceed 70 and 30%, respectively. The catalyst with the most stable operation was pentasil ZSM-5, but the selectivity of formation of branched isomers on it did not exceed 30% even at 260-280A degrees C and decreased to 3% as the reaction temperature increased to 400-450A degrees C. The fraction of aromatization products was then more than 15%. A study of the influence of C(6)-C(7) n-alkane additives on the isomerization of n-pentane on mordenite in the H-form under supercritical conditions at 260A degrees C and 120 atm showed that a gradual decrease in the activity of this catalyst in the isomerization of n-pentane was related to the formation of heavier hydrocarbons.