Diffusion of n-alkanes in mesoporous 5A zeolites by ZLC method |
| |
Authors: | Zhiping Liu Weiming Fan Zhaoteng Xue Jinghong Ma Ruifeng Li |
| |
Institution: | 1. College of Chemistry and Chemical Engineering, Taiyuan University of Technology, Taiyuan, 030024, China 2. Institute of Special Chemicals, Taiyuan University of Technology, Taiyuan, 030024, China
|
| |
Abstract: | Diffusion properties of mesostructured zeolite 5A were investigated by employing n-alkanes as probe molecules using the zero length column (ZLC) method. The mesopores were found to enhance molecule diffusion. Moreover, the effective diffusion time constant (D eff/R 2) increased with mesoporosity in the zeolites between 308 K and 393 K, whereas the activation energy decreased with increasing mesopore volume. The effective diffusivity values of n-alkanes in mesoporous zeolite 5A were generally higher than that the microporous zeolite 5A sample. This clearly implied the important role of the mesopore in zeolites crystals in facilitating the transport of reaction molecules due to shorter average diffusion path length and less steric hindrance. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|