Evidence of Single-File Diffusion by tracer ZLC Method

With growing interest for the use of one-dimensional (1-D) zeolites in separation and reaction processes, the need to understand diffusion and transport properties of molecules within the channels of these materials is becoming more eminent. The mechanism used to describe passage of molecules inside narrow 1-D micropores is called single-file diffusion. Typically, this behavior is observed within 1-D pore structures with channel diameters comparable to size of diffusing molecules. Under this circumstance, molecules cannot pass over one another resulting into high degree of mutual correlation between the movements of different molecules. In this paper, we report an experimental confirmation of single-file mechanism in toluene/ZSM-12 system using tracer Zero Length Column (TZLC) technique. Experimental Details