全硅FER沸石上有机吸附物脱附行为的研究

运用热分析技术,研究吸附在体相和表面结构完美的单晶状疏水全硅FER沸石孔道中的有机化合物的脱附行为,测定亲和性指数AT值和负载量。所研究的吸附质为直链烷烃、直链烷基醇、直链烷基胺等,结果显示醇有较低的AT值,而直链烷烃有较高的AT值,胺类有最高的AT值。证明全硅FER沸石骨架对烷基、胺基呈现出强的"亲和性",而对羟基呈现出“憎性”。同时还发现吸附质的链长对脱附性质、AT值也有较大影响。

Study on desorption of organics adsorbed on siliceous FER type zeolite

Thermal analysis was employed to investigate the interaction between the framework of siliceous FER type zeolite sample and the adsorbed organic compounds with various functional groups, such as alkyl-amines, alkyl-alcoholes, n-alkanes. The zeolite sample is in a form of single crystals and possesses perfect framework without Si(1Al) and Si-OH defect confirmed with XRD, FT-IR and 29Si MAS NMR. The affinity index (A_T value) was determined and used to compare the interaction between the adsorbed organic compounds and the framework. The organic molecules containing framework-philic functional group such as amino-group and n-alkanes show very high A_T values. The organics containing framework-phobic functional groups such as hydroxyl group show lower A_T values. On the other hand the chain length of alkyl group also affects on the values of A_T as well.