期刊
JOURNAL OF PHYSICAL CHEMISTRY B
卷 105, 期 25, 页码 5922-5927出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp003899f
关键词
-
The PFG NMR technique is applied to investigate the intracrystalline diffusion of methane and n-butane molecules in MFI-type zeolites at several temperatures (from 123 up to 383 K) and over a wide range of diffusion times (from 2 to 35 ms). The intracrystalline self-diffusion coefficients of the guest molecules recorded at low temperatures were observed to decrease with increasing root-mean-square displacements. The comparison of the experimental results with the results of the Monte Carlo simulations of diffusion allowed us to rule out the restriction of diffusion by crystal boundaries as a possible explanation of the observed dependencies of the diffusivities on the root-mean-square displacement. These dependencies are tentatively attributed to the existence of intracrystalline transport barriers in MFI-type crystals. The intersections between the elementary building blocks of the crystals and/or intergrowth sections of MFI crystals are suggested as the possible candidates for the transport barriers.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据