正构烷烃在LTL和ZSM-12分子筛中共振扩散的实验证明
Experimental proof for resonant diffusion of normal alkanes in LTL and ZSM-12 zeolites
摘要：
采用重量法研究了正构烷烃在LTL和ZSM-12分子筛中的晶内扩散行为。发现扩散系数随烷烃中碳原子数的变化呈周期性变化，为共振扩散提供了实验依据。在已有的共振扩散理论的基础上，得到了烷烃-沸石相互作用和沸石振动的几个重要参数。在所考虑的温度范围内的扩散系数遵循阿克里尼乌斯定律的指前因子和活化能的碳原子数在烷烃中的周期依赖性。同时增加的指前因子和活化能的补偿效应也成立。
英文摘要：
The intra-crystalline diffusion of normal alkanes in LTL and ZSM-12 zeolite was experimentally studied via gravimetric measurements performed at different temperatures. A periodic dependence of the diffusion coefficient on the number of carbon atoms in alkane was detected, which is an experimental proof for resonant diffusion. The present observations were described on the base of the existing theory of the resonant diffusion and several important parameters of the alkane-zeolite interaction and zeolite vibrations were obtained. In the considered temperature region the diffusion coefficient follows the Arrhenius law with periodic dependences of the pre-exponential factor and activation energy on the number of carbon atoms in alkanes. A compensation effect of simultaneous increases of the pre-exponential factor and the activation energy was also established.
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