Activated carbons(ACs)with controlled microporosity have been developed from oil palm shell and their H2 storage performances been have tested at 77 K.Such adsorbents are the natural agricultural by-products of chemically activated with KOH.N2 adsorption-,desorption at 77 K was used to investigate the pore structure of the ACs produced with different weight ratio of KOH/oil palm shell charcoal.The results showed that the developed oil palm shell ACs achieved surface areas(Sbet)as high as 3508 m2/g and micropores volumes(Vdr)as high as 1.10 cm~3Vg.Outstanding storage capacities of hydrogen,as high as 6.8 wt.% have been obtained at 4 MPa and 2.86 wt.% have been obtained at 1 bar for some of these adsorbents at 77 K.These values of hydrogen adsorption are among the best that ever published so far,which well above those of some reference commercial materials,e.g.Maxsorb-3,and also the ACs from the open literature.
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