Shang Mengge, Peng Xiaoqian, Zhang Jing, Liu Xiaochan, Yuan Zhipeng, Zhao Xinfu, Liu Sijia, Yu Shimo, Yi Xibin, Filatov Serguei
Shandong Key Laboratory for Special Silicon-containing Material, Advanced Materials Institute, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250014, P. R. China.
Laboratory of Hydrogen Energy, Institute of Heat and Mass Transfer of the National Academy of Sciences of Belarus, Minsk 220072, Belarus.
ACS Appl Mater Interfaces. 2023 Mar 13. doi: 10.1021/acsami.2c19929.
Adsorption natural gas (ANG) is a technology in which natural gas is stored on the surface of porous materials at relatively low pressures, which are promising candidates for adsorption of natural gas. Adsorbent materials with a large surface area and porous structure plays a significant role in the ANG technology, which holds promise in increasing the storage density for natural gas while decreasing the operating pressure. Here, we demonstrate a facile synthetic method for rational construction of a sodium alginate (SA)/ZIF-8 composite carbon aerogel (AZSCA) by incorporating ZIF-8 particles into SA aerogel through a directional freeze-drying method followed by the carbonization process. The structure characterization shows that AZSCA has a hierarchical porous structure, in which the micropores originated from MOF while the mesopores are derived from the three-dimensional network of the aerogel. The experimental results show that AZSCA achieved high methane adsorption of 181 cm·g at 65 bar and 298 K, along with higher isosteric heat of adsorption (Q) throughout the adsorption range. Thus, the combination of MOF powders with aerogel can find potential applications in other gas adsorption.
吸附天然气（ANG）是一种在相对低压下将天然气存储在多孔材料表面的技术，这些多孔材料是吸附天然气的理想候选材料。具有大表面积和多孔结构的吸附剂材料在ANG技术中起着重要作用，该技术有望提高天然气的存储密度，同时降低操作压力。在此，我们展示了一种简便的合成方法，通过定向冷冻干燥法将ZIF-8颗粒引入海藻酸钠（SA）气凝胶中，随后进行碳化过程，从而合理构建海藻酸钠（SA）/ZIF-8复合碳气凝胶（AZSCA）。结构表征表明，AZSCA具有分级多孔结构，其中微孔源自金属有机框架（MOF），而中孔则源自气凝胶的三维网络。实验结果表明，AZSCA在65巴和298K条件下实现了181 cm³·g的高甲烷吸附量，并且在整个吸附范围内具有更高的等量吸附热（Q）。因此，MOF粉末与气凝胶的结合在其他气体吸附方面具有潜在应用。
