INFLUENCE OF STRUCTURE AND ACIDITY-BASICITY OF ZEOLITES ON PLATINUM SUPPORTED CATALYSTS OF N-C6 AROMATIZATION

L, Y zeolites were used as carrier to support Pt, and the catalytic pr operties of the supported Pt catalysts in n-hexane aromatization were investigated. The pore system of L zeolite proved to be beneficial for Pt clusters, exhibiting a high benzene selectivity in n-hexane aromat ization. The secondary pores of zeolite L had a negative influence on the aromatization over Pt/BaKL. With these secondary pores blocked, th e 0.4% Pt/BaKL-1 sample could keep up with the excellent aromatization properties of 0.6% Pt/BaKL zeolite. Pt dispersed on KL basic zeolite exhibited dehydrogenation activity in isopropanol decomposition. Pt su pported on NH4L acidic zeolite enhanced the conversion of isopropanol to form water and propene. IR results of linear CO adsorbed on Pt/L ze olites suggested the Pt on NH4L acidic zeolite was ''electron deficien t'', and Pt on KL basic zeolite exhibited some electron excess, which results from the interaction of Pt and zeolites with different acidic- basic properties.