Natural gas sorption evaluation on microporous materials
Natural gas sorption evaluation on microporous materials
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DOI：
10.1016/j.micromeso.2016.08.013
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发表时间：
2016-11
影响因子：
5.2
通讯作者：
Jingmei Shen;A. Dailly;M. Beckner
中科院分区：
文献类型：
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作者：
Jingmei Shen;A. Dailly;M. Beckner
在这项工作中，详细比较了天然气（NG）混合物的吸附容量，循环稳定性和物理性能的10个微孔样品进行。吸附剂的BET比表面积和BET体积显示与其在298 K和高达70 bar下的最大过量NG吸附容量相关，而与材料的化学性质和功能无关。循环稳定性高度依赖于材料的孔径和孔径分布。已知最佳孔宽为8-11 μ m的窄孔径分布可提高最大过量甲烷吸附。然而，当考虑NG共混物含有具有更高的结合能和更慢的扩散速率比甲烷的组件，我们表明，大的微孔，甚至中孔是必要的，以提供容易的扩散路径的吸附物分子被解吸和扩散出的孔隙网络。太小的孔（例如< 5 μ m）是不期望的，因为大物质很可能被捕获，导致随着循环存储容量降低。天然气储存应用的吸附剂定制和开发似乎明显不同于纯甲烷。
In this work, detailed comparisons of the natural gas (NG) mixture adsorption capacity, cycling stability and physical properties of ten microporous samples were conducted. The BET specific surface area and micropore volume of the adsorbents are shown to correlate to their maximum excess NG adsorption capacity at 298 K and up to 70 bar, irrespective of the chemistry and functionalities of the materials. The cycling stability highly depends on the material's pore size and pore size distribution. A narrow pore size distribution with an optimum pore width of 8–11 Å is known to improve the maximum excess methane adsorption. However, when considering NG blends containing components with higher binding energies and slower diffusion rates than methane, we show that large micropores and even mesopores are necessary to provide easy diffusion paths for the adsorbate molecules to be desorbed from and diffuse out of the pore network. Pores which are too small, e.g. < 5 Å, are not desired since it's highly possible that the large species can be trapped in, resulting in a decrease in storage capacity with cycling. Adsorbent tailoring and development for NG storage applications appears to be sensibly different than for pure methane.