正戊烷和甲醇共芳构化反应中Zn/ZSM-5催化剂的失活研究

对正戊烷和甲醇共芳构化反应与单独芳构化反应进行了比较，通过催化剂连续反应及再生的方法对共芳构化反应中导致Zn/ZSM-5催化剂失活的因素进行了系统的探究，并采用X射线衍射(XRD)、氨气程序升温脱附(NH3-TPD)、吡啶吸附红外光谱(Py-FTIR)、氮气吸附-脱附等方法对新鲜剂和再生后的催化剂进行了表征。结果表明：共芳构化反应相比于甲醇单独芳构化反应，催化剂失活减慢，共芳构化反应相比于正戊烷单独芳构化反应，可以得到更高的芳烃选择性；共芳构化反应中有甲醇存在时，催化剂除了积炭失活外，还存在分子筛水热脱铝失活，导致再生后的催化剂不能完全恢复原有的活性。

STUDY ON DEACTIVATION OF Zn/ZSM-5 CATALYST IN CO-AROMATIZATION REACTION OF n-PENTANE AND METHANOL

The deactivation factors for Zn/ZSM-5 catalyst in co-aromatization reaction of methanol and n-pentane were investigated by continuous reaction and regeneration experiments. The results were compared with the single compound aromatization. The fresh and the regenerated catalyst were characterized by XRD, NH3-TPD, Py-FTIR, BET techniques. The results showed that compared with methanol aromatization, the deactivation of the catalyst was slower, and the selectivity of aromatics was improved by co-aromatization compared with n-pentane aromatization. When methanol is present in the co-aromatization reaction system, the catalyst was deactivated not only by coke, but also by hydrothermal dealumination of molecular sieve, so that the regenerated catalyst cannot completely recover its original activity.