Abstract
The dispersion and the thermal stability of platinum in Zeolite Y is dramatically increased by non-reducible cations of transition or rare earth metals. These ions basically exert three functions: they can (1) occupy exchange sites in small cages thus forcing platinum ions to stay in supercages; they (2) interact chemically with platinum particles, anchoring them to the zeolite matrix; and (3) they act as catalyst promoters. Accordingly we found that Pt/FeNaY zeolite catalysts exhibit higher activities for benzene hydrogenation and n-hexane hydrogenolysis than Pt/NaY, but the activity for methylcyclopentane (MCP) hydrogenolysis is lower for Pt/FeNaY. Catalysis of Pt/NaY is similar to that of Pt/SiO2, but the ring opening selectivity of MCP is significantly different, presumably due to geometric constraints.
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