Abstract
Activated carbon materials are good candidates for natural gas storage due excellent textural properties that are easy to enhance and modify. Natural gas is much cleaner fuel than coal and other petroleum derivatives. Storage of natural gas on porous sorbents at lower pressure is safer and cheaper compared to compressed and liquefied natural gas. This article reviews some works conducted on natural gas storage on biomass based activated carbon materials. Methane storage capacities and deliveries of the various sorbents were given. The effect of factors such as surface area, pore characteristic, heat of adsorption, packing density on the natural gas storage capacity on the activated carbons are discussed. Challenges, improvements and future directions of natural gas storage on porous carbonaceous materials are highlighted.
Highlights
Natural gas is cheap, clean [1], safe and abundant energy source [2]
Surface area of activated carbon used for natural gas adsorption was in the range of few hundreds to 3000 m2/g [5]
The results showed that the activated carbon modified by potassium carbonate sample has the higher equilibrium selectivity for CO2 over CH4
Summary
Clean [1], safe and abundant energy source [2]. Due to these advantages, its storage, transportation and utilization have attracted global attention [3]. NG is transported overseas as liquefied natural gas (LNG) in ships, LNG requires expensive cryogenic process [4] It is usually stored as a boiling liquid at about (1610C) in a cryogenic tank at a pressure of about 14.7 psia. ANG (Adsorbed natural gas) is viewed as alternative technology to CNG and LNG. Among solid adsorbents, activated carbons have been used and evaluated for methane adsorption They are good candidates for natural gas storage due to large surface area, large pore volume and low density. This paper reviewed the existing literature on natural gas/methane adsorption on biomass based porous carbons. Both single and gas mixture adsorption is discussed, challenges of ANG technology and improvements in the system are given
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