摘要
用常压和水热法制备了具有不同交换度的LaHZSM-5沸石,以XPS、IR、XRD及正十五烷裂解对其进行了表征。结果表明,水热法可获得较高交换度的LaHZSM-5沸石。La^(3+)交换的沸石较相同Si/Al比的HZSM-5沸石活性高,对气体的选择性降低,提高了C_(5～10)馏分的选择性。
In this paper LaHZSM-5 zeolites with varying exchange degree were prepared by the conventional and the hydrothermal liquid-solid exchange. The prepared LaHZSM-5 zeolites were characterized by XPS and IR spectroscopy, X-ray diffraction as well as the cracking of pentadecane. The results show that the LaHZSM-5 zeolite samples with higher exchange degree can be prepared by the hydrothermal exchange. LaHZSM-5 zeolite has a higher cracking activity than HZSM-5 zeolite. After the incorporation of La by exchange, the selectivity for gas is decreased and the selectivity for Cs-10 is increased. In addition, the hydrothermal stability of the activity of ZSM-5 zeolite is also enhanced owing to the incorporation of La ion by exchange.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1993年第4期545-547,共3页
Chemical Journal of Chinese Universities
基金
国家稀土化学与物理开放实验室资助
关键词
ZSM-5
沸石
裂解
镧离子交换
ZSM-5 zeolite, La3+ exchange, Cracking, Rare earth
