摘要
采用捏合法和混合法制备得到Pt负载SAPO-11/MOR复合分子筛催化剂,采用XRD、BET及NH3-TPD表征了其物化性质。以正庚烷为模型化合物,考察了捏合法和混合法2种不同方法制备的Pt负载型复合分子筛催化剂Pt-SAPO-11/MOR和Pt-SAPO-11//Pt-MOR的异构化催化性能。结果表明,Pt-SAPO-11/MOR和Pt-SAPO-11//Pt-MOR催化剂的异构化催化性能差异较大。捏合法减少了复合分子筛催化剂的强酸中心,同时,其催化剂中不同类型分子筛间的结合更为紧密,使反应中间体及产物更容易在分子筛间迁移,其协同作用促进了多支链异构体的生成。
The hydroisomerization prepared by kneading method catalysts of Pt-SAPO-11/MOR and Pt-SAPO-11//Pt-MOR were and mixed method of Pt loaded on SAPO-11/MOR. The physicochemical properties of Pt-SAPO-11/MOR and Pt-SAPO-11//Pt-MOR were characterized by XRD, BET and NH3-TPD. The catalytic hydroisomerization performances of these catalysts were evaluated with n-heptane as model compound. The results indicated that the preparation method of the composite zeolite catalyst had much influence on its catalytic activity for n-heptane hydroisomerization. The strong acidity of Pt-SAPO-11/MOR prepared by kneading method was reduced. In addition, the combination between different molecular sieves in Pt-SAPO-11/MOR was stronger, so the migration of reaction intermediates and products was easier between the molecular sieves. The synergistic effect of two zeolites promoted the formation of multibranched isomers.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2015年第3期670-677,共8页
Acta Petrolei Sinica(Petroleum Processing Section)
关键词
复合方式
复合分子筛
协同作用
临氢异构化反应
composite methods
composite zeolites
synergistic effect
hydroisomerization
