Abstract
A natural gas car has been expected as an eco-friendly vehicle, as it is relatively clean burning fuel and economical. The adsorbed natural gas (ANG) is considered to be the most suitable option than the compressed gas (CNG) for vehicles because the ANG is available at the lower storage pressure. The preparative conditions including activation methods are crucial for the development of porous structure suitable for the high storage capacity. In this study, a disk type porous carbon adsorbent was developed by pressurized carbonization process using commercial phenol resin. The weight loss and volumetric reduce of the carbonaceous materials were remarkable at the beginning of the CO2 activation and increased the surface area, pore volume of adsorbent. The methane storage performance of the disk type porous carbon sorbent was evaluated by volumetric methane adsorption capacity of a storage vessel (V/Vs). The storage capacity (V/Vs) reached up to 128 (3.5MPa) when CO2 activation was performed at 600°C for 5h. In addition, the excessive activation deteriorated the development of pore structure and V/Vs. It was also found that not only specific surface area but also bulk density was important for improvement of V/Vs. The relationship between the storage capacity of methane and the preparation conditions of the disk type porous carbon adsorbent was discussed.
