Pt/KL芳构化催化剂中载体酸碱性的作用

采用水热脱铝法提高硅铝比使L分子筛的酸性增强，采用离子交换法脱除KL分子筛上部分的K使分子筛的碱性降低。并担载Pt制成芳构化催化剂，考察了具有不同酸碱性的载体及其催化剂的物化性质和催化性能，发现载体的酸碱性对Pt的电子状态及Pt在分子筛孔道内的分散有明显的影响，从而产生不同的芳构化反应活性和选择性；随着载体酸性增强和碱性减弱，催化剂的活性降低，芳构化反应选择性下降。

ROLE OF ACIDITY AND BASICITY OF ZEOLITE SUPPORT IN Pt/KL CATALYSTS FOR AROMATIZATION OF ALKANE

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.