Diffusion of propene in DDR crystals studied by interference microscopy

Diffusion of propene in DDR crystals studied by interference microscopy
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通过干涉显微镜研究丙烯在 DDR 晶体中的扩散

DOI:
10.1016/j.ces.2015.07.029
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发表时间:
2015
影响因子:
4.7
通讯作者:
D.M. Ruthven
D.M. Ruthven
中科院分区:
工程技术2区
文献类型:
--
作者:
A. Lauerer;T. Binder;J. Haase;J. Kärger;D.M. Ruthven

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相似文献

本文介绍了用干涉显微镜(IFM)对丙烯在DDR沸石(ZSM-58的纯硅类似物)大晶体中的扩散进行了详细的实验研究的结果。扩散非常缓慢,因为丙烯分子仅小到足以通过DDR结构的扭曲的8环窗口。这使得有可能在可用的时间内测量许多浓度分布,从而在更快的系统中不可能的细节水平上研究扩散行为。在理想的DDR晶体中,扩散应仅在径向方向上发生。在实际的系统中,径向扩散占主导地位,但也有一个小的,但显着的轴向分量,这使实验数据的解释复杂化。扩散率随着载荷的增加而强烈增加,但这种效应的明显幅度可能会因轴向扩散的小贡献而增加。径向扩散的活化能约为34 kJ/mole。
This paper presents the results of a detailed experimental study of the diffusion of propene in large crystals of DDR zeolite (the pure silica analog of ZSM-58) carried out by interference microscopy (IFM). Diffusion is very slow as the propene molecules are only just small enough to pass through the distorted 8-ring windows of the DDR structure. This makes it possible to measure many concentration profiles during the available time and thus to study the diffusional behavior at a level of detail that would be impossible in faster systems. In an ideal DDR crystal diffusion should occur only in the radial direction. In the actual system radial diffusion was dominant but there is also a small but significant axial component which complicates the interpretation of the experimental data. The diffusivity increases strongly with loading but the apparent magnitude of this effect may be increased by the small contribution from axial diffusion. The activation energy for radial diffusion is about 34 kJ/mole.
圆柱对称纳米多孔主体系统中瞬态客体轮廓的显微成像。
DOI: --
发表时间: 2012
影响因子: 4.4
作者:
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DOI: 10.1038/ncomms8697
发表时间: 2015-07-16
影响因子: 16.6
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DOI: --
发表时间: 2013
期刊:
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DOI: --
发表时间: 2003
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DOI: 10.1021/ja211492b
发表时间: 2012-05-09
影响因子: 15
作者:
Hibbe, Florian;Caro, Juergen;Kaerger, Joerg
通讯作者: Kaerger, Joerg