The Influence of Zeolite Modul in Catalysts Pt/MOR/Al2O3 on the Performance of the Reaction of n-Heptane Isomerization

Abstract

The influence of acidic module of mordenite (SiO2/Al2O3 – 20 and 30) in catalysts Pt/MOR/Al2O3 on the performance of the reaction of n-heptane isomerization was studied. The zeolite proportion in zeolites was varied from 10 to 50 wt.%; different precursors (H2PtCl6 and [Pt(NH3)4]Cl2) were used for supporting platinum. Methods of TPD of ammonia and IRS (adsorption of NH3, CO) were used to establish that an increase in the module results in a decrease in the total zeolite acidity: the number of Broensted and Lewis acid sites (BAS and LAS, respectively) decreases, the acid strength of LAS being increased. The catalysts were tested using the reaction of n-heptane isomerization. The growth of the acidic module of mordenite from 20 to 30 was shown to lead to a considerable decrease in the selectivity.