Design And Preparation Of Functional Nanoporous Materials And Its Application For Methane Storage

With the continued growth in worldwide consumption of gasoline and diesel and the growing demand for clean energy, natural gas has been more and more important as an alternative transformational fuel. Natural gas powered cars have existed for decades, but their ability to compete with cars powered by liquid fuels has been hampered by the difficulty of storing large amounts of the gas. The traditional natural gas storage technology is carried out under ultra-high pressure (above 200 bar) or low temperature, which requires expensive tanks and a costly multistage compression system.At present, people have begun to use adsorbed natural gas technology (ANG) to replace the traditional compressed natural gas technology (CNG) and liquefied natural gas (LNG) technology. The main compound of natural gas is methane, and the key to realize efficient storage of natural gas is to prepare economical adsorbent with high stability and high capacity. The system with adsorbent can achieve a large number of natural gas storage at lower pressure and room temperature. In order to achieve this, the adsorbent must have high specific surface area,a suitable pore size distribution (0?2 nm) , and high pore volume. In this paper, new nanoporous materials were designed and prepared to realize the efficient storage of methane.The research of this paper mainly includes: (1) preparation of nanoporous polystyrene by external and internal crosslinking; (2)prepare metal organic framework materials with mixed organic ligands(linker). The porous properties of these adsorbents and methane adsorption were studied. Among them, a kind of material obtained by internal hypercrosslinking has very high specific surface area and micropore volume, 2084 m2.g-1, and 0.78 cm3.g-1 respectively. At the condition of 35 bar and 298 K, the methane excess gravimetric capacity of the material can reach to 10.5 wt%, which can significantly increase the system's ability of natural gas storage. At the same time the material also has good stability and moderate adsorption enthalpy.