Abstract: KL zeolite was hydrothermal dealuminated to increase the acidity of zeolite; some of the potassium ions in KL zeolite were removed by ion-exchange method to decrease the basicity of zeolite. Pt/KL catalysts for aromatization of alkane prepared by various acidity and basicity zeolite supports were characterized by a variety of techniques and their catalytic performance was evaluated. Results showed that the electronic states of Pt and the dispersion of Pt in zeolite pores and channels were significantly influenced by the acidity and basicity of zeolite supports, thus, the activities and selectivities of catalysts prepared by different zeolite supports during aromatization of alkane were varied. With the increase of acidity and the decrease of basicity of the support, the activity and the selectivity of the catalyst decreased.

Key words: aromatization, Pt, KL, zeolite, acidity, basicity