环戊烷和环己烷在silicalite-1分子筛上的热脱附行为

采用智能质量分析仪(IGA)及TG/DTG法研究了环戊烷和环己烷在硅沸石silicalite-1上的热脱附行为。当环戊烷在silicalite-1上吸附量小于4 m/uc时，TG/DTG曲线表明环戊烷在silicalite-1上存在一个脱附过程。吸附量大于4 m/uc，TG曲线显示热脱附过程明显分为两个阶段，DTG曲线中出现两个明显的脱附峰，彼此分离。环己烷在silicalite-1上只存在一种脱附过程，DTG曲线只出现一个脱附峰。从环戊烷和环己烷的热脱附曲线中也可看出，随着吸附量的增加脱附峰温逐渐向高温方向偏移。

Thermal desorption behavior of cyclopentane and cyclohexane in silicalite-1 zeolites

The thermal desorption behaviors of cyclopentane and cyclohexane in silicalite-1 was studied by using IGA and TG/DTG mehods. Only one thermal desorption course was observed in TG profiles when the initial adsorption loading of cyclopentane in silicalite-1 is lower than 4 m/uc. However, two obvious thermal desorption courses appeared in TG profiles when the initial adsorption loadings is higher than 4 m/uc. And there is an inflection at about 4 m/uc on the TG curves. The DTG profiles of cyclopentane exhibited two distinctive peaks separated each other. Only one thermal desorption course for cyclohexane in silicalite-1 appeared and the DTG profile show only one peak. From the thermal desorption profiles of cylopentane and cyclohexane, it can be seen that the desorption peaks move to higher temperature with the increase of the initial adsorption loadings. The temperature of desorption peak for cyclohexane is higher than that for cyclopentane at the same loading.