The objective of this study is to analyse the possibility of using lignocellulosic materials for the preparation of activated carbon monoliths which could be used for methane storage. The approach used here will be the chemical activation, incorporating a pressing step to obtain monoliths. The raw material is olive stone wich is chemically activated with solutions of phosphoric acid. The impregnated material is pressed to obtain the monoliths which are carbonised. When low impregnation ratio are used the bulk density increases, due to the action of the phosphoric acid which reduces the production of tars incorporating them into the structure as carbon. For high impregnation ratio the bulk density decreases, as expected, because the action of the chemical agent is more intense. The true density increases with the amount of phosphoric acid because it favours the transformation of lignocellulosic material to carbon. To furher develop the porosity some of the discs were physically activated with CO2. The chemical activation method is appropriate to prepare activated carbon monoliths without binder. They have high microporosity, high density and minimum interparticle space. The activated carbon monoliths prepared by chemical activation alone have methane storage capacities near to 140 v/v, which is increased if they are further activated with gases.
Preparation of activated carbon monoliths for methane storage
Herstellung von Aktivkohlemonolithen für die Speicherung von Methan
2000
2 Seiten, 1 Bild, 1 Tabelle, 4 Quellen
Conference paper
English
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