重量法测定环戊烷在silicalite-1分子筛上的吸附特性

Determination of the adsorption feature of cyclopentane in silicalite-1 by using intelligent gravimetric analyser

用智能重量分析技术 (IGA)研究了环戊烷在silicalite 1分子筛上的吸附特性。结果表明 ,随着温度的降低 ,环戊烷的吸附等温线从第一类型过渡为第四类型 ,在 2 5 4K和 2 74K温度下吸附等温线呈现滞后环 ,为第四类型 ,而吸附等温线在 30 4K、32 3K下为阶梯形 ,在 35 4K、42 3K温度下呈第一类型 ,其中 42 3K温度下的吸附等温线可准确的用Langmuir方程来描述。本文同时讨论了吸附质分子间以及吸附质和吸附剂间的相互作用、分子结构特性、分子筛对吸附质分子的空间位阻、分子筛的能量不均匀表面等对环戊烷在silicalite

The adsorption feature of cyclopentane in silicalite 1 was studied by using intelligent gravimetric analyser technology.The study result showed that the shape of the isotherm changed from type I to type IV with decreasing temperature. The isotherms at temperatures of 254 K,274 K,in which pronounced loops could be detected, were type IV, while step like isotherms could be observed at temperatures of 304 K,323 K,and the isotherms at 354 K, 423K were type I.The isotherm at 423 K, could well be derived from Langmiur equation. The pronounced impacts of the sorbate-sorbate interactions,the sorbate-sorbent interactions, the structure feature of cyclopentane molecular,the steric hindrance of the framework of silicalite 1 to the sorbed molecules and the energetically heterogeneous sorption sites of silicalite 1 on the adsorption feature of cyclopentane in silicalite 1, were also discussed.