To be technically effective in a commercial separation process, whether this be a bulk separation or purification, an adsorbent material must have a high internal volume which is accessible to the components being removed from the fluid. Such a highly porous solid may be carbonaceous or inorganic in nature, synthetic or naturally occurring, and in certain circumstances may have molecular sieving properties. The adsorbent must also have good mechanical properties such as strength and resistance to attrition and it must have good kinetic properties, that is, it must be capable of transferring adsorbing molecules rapidly to the adsorption sites. In most applications, the adsorbent must be regenerated after use and therefore it is desirable that regeneration can be carried out efficiently and without damage to mechanical and adsorptive properties of the adsorbent. The raw materials and method of producing adsorbents must ultimately be inexpensive for adsorption to compete successfully on economic grounds with alternative separation process (Thomas and Crittenden, 1998). The most important attributes of an adsorbent for any application are: adsorptive capacity, selectivity, regenerability, kinetics, compatibility and cost.