Abstract Gas translation diffusion is proposed to compete with surface diffusion for describing the permeation of light gases (He, H2, CO2 and CO) through zeolite membranes. The analysis for both DD3R and NaY zeolite membranes shows some differences in H2, CO and CO2 permeation for both binary/ternary gas mixture and single gas. The permeation description through gas translation of weakly adsorbed species such as, e.g., H2, specifically at low temperatures, is more accurate than that obtained by Knudsen diffusion in a previous work. Gas translation paired to surface diffusion well reproduces the maximum in H2 flux, which was missed by the Knudsen diffusion (Caravella et al., 2016) [13]. The strongly adsorbed species are less dependent on gas translation or Knudsen diffusion since the surface diffusion is very significant in the whole temperature range investigated. The gas translation was demonstrated to reproduce the permeation through zeolite membranes better than Knudsen diffusion. This paper attempts to discriminate the operating mechanisms among gas translation, surface and Knudsen diffusion in gas mixture permeation through zeolite membranes.

中文翻译：

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分子筛膜渗透中气体平移、表面扩散和克努森扩散的区别

摘要 气体平移扩散被提议与表面扩散竞争以描述轻气体（He、H2、CO2 和 CO）通过沸石膜的渗透。DD3R 和 NaY 沸石膜的分析表明，二元/三元气体混合物和单一气体在 H2、CO 和 CO2 渗透方面存在一些差异。通过弱吸附物质（例如 H2）的气体转换进行的渗透描述，特别是在低温下，比在先前的工作中通过 Knudsen 扩散获得的描述更准确。与表面扩散配对的气体平移很好地再现了 H2 通量的最大值，而 Knudsen 扩散忽略了这一点（Caravella 等人，2016 年）[13]。强吸附物质较少依赖于气体平移或 Knudsen 扩散，因为表面扩散在研究的整个温度范围内非常显着。气体平移被证明比克努森扩散更好地再现了通过沸石膜的渗透。本文试图区分气体混合物在沸石膜渗透中的气体平移、表面和 Knudsen 扩散之间的运行机制。