Progress in Studies of Natural Gas Storage with Wet Adsorbents

摘要

Progress in natural gas storage with wet adsorbents is presented. The storage mechanism switched from adsorption for adsorbed natural gas (ANG) to hydrate formation when wet adsorbents were used. The activated carbon with a pore size of 1.6- 3 nm was shown more suitable for the wet storage method, and a larger than 40 wt % gravimetric storage capacity and a deliverable capacity of more than 150 (v/v) were experimentally observed under conditions of 273-283 K and pressure ca. 8 MPa. The stored amount in wet carbon is 2 times higher than that of adsorbed and 1.5 times than that of compressed at the indicated conditions. All of the inherent technical drawbacks of ANG were overcome, and the storage pressure reduced more than half compared to compressed natural gas (CNG). Both investment and energy costs of fuel are expected to reduce, and the safety of the natural gas (NG) vehicle will improve radically.