2007, №4

сс. 60-69

n-Pentane Isomerization under Supercritical Conditions over Pt-Modified Solid Acid Catalysts

2007, №4

сс. 60-69

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V.I. Bogdan, A.E. Koklin, V.B. Kazansky

Key words: supercritical n-pentane, catalytical isomerization, zeolite catalysts

The study of n-pentane isomerization under supercritical conditions over unmodified and Pt-modified acid catalysts (WO3- and H4[Si(W3O10)4]-loaded TiO2, different types of zeolites) was carried out in continuous flow reactor in the range of temperature 220÷350 °С and pressure 50÷130 atm, liquid hourly space velocity was varied between 6 and 30 h-1. Base acid catalysts were either not active (WO3/TiO2), or subjected to quick deactivation (H4[Si(W3O10)4]/TiO2). Their platinum modification leads to dramatic increase of total conversion up to 50% and to decrease of poison rate during 3÷5 hours. The most active and selective catalyst for n-pentane isomerization under supercritical conditions among examined zeolites systems was H-form of mordenite, but platinum modification decreases the catalyst activity. Process of cracking was prevailing over H-ZSM-5, but its modification with platinum leads to gain of iso-pentane yield.
Key words: supercritical n-pentane, catalytical isomerization, zeolite catalysts.