Institut de Chimie des Milieux et Matériaux de Poitiers (IC2MP), UMR 7285 CNRS/Université de Poitiers, 4 Rue Michel Brunet, 86022 Poitiers Cedex, France.
J Chromatogr A. 2012 Oct 19;1260:206-14. doi: 10.1016/j.chroma.2012.08.079. Epub 2012 Aug 30.
The mass transfer phenomena of isobutane (i-C4) were investigated at 343K on three protonic BEA zeolites. Defined by their crystallites sizes and degrees of aggregation, these samples were characterized by Reversed-Flow Inverse Gas Chromatography (RF-GC). This simple technique, used in conjunction with numerical computation, allowed the determination of physicochemical quantities like local monolayer capacities, probability density functions and diffusion coefficients in a time-resolved way. This study enabled to conclude that the effective diffusion coefficient was affected by the size of the zeolite agglomerate whereas the surface diffusion depended on the zeolite crystallite size.
在 343K 下，对三种质子 BEA 沸石进行了异丁烷（i-C4）的传质现象研究。这些样品通过反相流动反向气相色谱法（RF-GC）根据其晶粒尺寸和聚集度来定义。该简单技术与数值计算结合使用，可以以时间分辨的方式确定局部单层容量、概率密度函数和扩散系数等物理化学量。这项研究的结论是，有效扩散系数受到沸石团聚体大小的影响，而表面扩散则取决于沸石晶粒尺寸。
