Synthesis of carbon Nano-Adsorbent for Guard Bed in ANG Vehicles

Natural gas is considered as a main energy resource. This type of fuel is clean and inexpensive, so during the recent years has been kept sustained attention in order to utilize in transportation field as a fuel. Natural gas in mostly composed of methane, but it also contains some heavier hydrocarbons like ethane thatgradually occupy the micro-pore volume which should be available for methane fraction in an ANG tank in an automobile. Consequently, this issue poses aserious challenge in storage system and brings the net capacity of storage down. Purpose is high adsorption of ethane in the guard bed and high adsorption ofmethane in the adsorption tank. To solve this problem, heavier hydrocarbons are separated clearly in the guardbed before the natural gas enters the storage tank. Then reunify with the gas fractions during discharge cycle and use in automobile. In this research six kinds of activated carbons were prepared as guard-bed adsorbents, which the temperature of activation and the mesh size of walnut, as raw material, were studies in the synthesis process. In this research the main idea is adsorption and separation of ethane from natural gas. The sample which the mesh size for its raw material was more than 0.046 μm and the activation temperature was 600 °C has considerable ethane /methane adsorption ratio, which was 3.4165. The surface area is 1770.6069 m2/gr and the mean pore size diameter is 3.41888 nm for this optimum activated carbon obtained which can be acceptable adsorbent to be used in guard beds.

کلیدواژه ها:

ANG vehicle ، Nano-adsorbent ، Guard bed