This work investigates the effect of condensable Hg vapour on the transport of N-2 gas across cobalt oxide silica (CoOxSi) membranes. Experimental results suggest that Hg significantly affects N-2 permeation at 100 and 200 degrees C, though this effect is negligible at 300 degrees C. This effect was found to have a correlation with Hg adsorption on CoOxSi xerogels. In order to understand the Hg effect in the transport phenomena of N-2 permeation, the oscillator model was used to model gas transport through pores with different sizes. By including effective medium theory (EMT), the oscillator model fitted well the experimental results and gave good prediction of mass transfer in ultra-microporous materials with a tri-modal pore size distribution, such as silica membranes. It is postulated that Hg seeks lower level potentials in micro-pores, and therefore Hg molecules tend to block small pores (2.5-4 angstrom from 2.9 angstrom), or reduce the average pore size of larger pores (6.7-7.8 angstrom and 12-14 angstrom). Although N-2 permeation decreased with the presence of Hg, it did not decrease when the Hg load was increased by a factor of ten; this strongly suggests the adsorption of Hg molecules in the smaller pores (2.5-4.0 angstrom), or along the pore wall for the larger pore ranges (6.7-7.8 angstrom and 12-14 angstrom). (C) 2018 Elsevier Ltd. All rights reserved.

中文翻译：

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含汞气体在微孔二氧化硅膜中传输的研究与模拟

这项工作研究了可冷凝的 Hg 蒸汽对 N-2 气体穿过氧化钴二氧化硅 (CoOxSi) 膜的传输的影响。实验结果表明，Hg 在 100 和 200 摄氏度时显着影响 N-2 渗透，尽管这种影响在 300 摄氏度时可以忽略不计。发现这种影响与 Hg 在 CoOxSi 干凝胶上的吸附有关。为了理解 N-2 渗透传输现象中的 Hg 效应，使用振荡器模型来模拟气体通过不同尺寸孔隙的传输。通过包括有效介质理论 (EMT)，振荡器模型很好地拟合了实验结果，并对具有三模态孔径分布的超微孔材料（如硅胶膜）中的传质给出了良好的预测。假设 Hg 在微孔中寻找较低水平的电位，因此汞分子往往会阻塞小孔（2.9 埃到 2.5-4 埃），或减小较大孔（6.7-7.8 埃和 12-14 埃）的平均孔径。尽管 N-2 渗透率随 Hg 的存在而降低，但当 Hg 负荷增加 10 倍时，N-2 渗透率并未降低；这强烈表明 Hg 分子在较小的孔（2.5-4.0 埃）中吸附，或沿孔壁吸附较大的孔范围（6.7-7.8 埃和 12-14 埃）。(C) 2018 Elsevier Ltd。保留所有权利。这强烈表明 Hg 分子在较小的孔（2.5-4.0 埃）中吸附，或沿孔壁吸附较大的孔范围（6.7-7.8 埃和 12-14 埃）。(C) 2018 Elsevier Ltd。保留所有权利。这强烈表明 Hg 分子在较小的孔（2.5-4.0 埃）中吸附，或在较大的孔范围（6.7-7.8 埃和 12-14 埃）沿孔壁吸附。(C) 2018 Elsevier Ltd。保留所有权利。