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AuthorBader, Najoua
AuthorZacharia, Renju
AuthorAbdelmottaleb, Ouederni
AuthorCossement, Daniel
Available date2017-05-10T10:34:19Z
Publication Date2017-04-27
Publication NameJournal of Porous Materials
Identifierhttp://dx.doi.org/10.1007/s10934-017-0436-8
CitationBader, N., Zacharia, R., Abdelmottaleb, O. et al. "How the activation process modifies the hydrogen storage behavior of biomass-derived activated carbons" Journal of Porous Materials, Available online 27 April 2017
ISSN1380-2224
URIhttp://hdl.handle.net/10576/5488
AbstractMicroporous activated carbons (ACs) derived from biomass residues, by virtue of their low-cost, good thermo-mechanical stability and easy adsorbent regeneration, are widely considered as hydrogen storage materials for near-term applications. The hydrogen uptake performance of activated carbons is known to depend on the pore-textural and surface characteristics, such as size and distribution of micropores and specific surface area. Here, we present a detailed investigation on how the activation processes using KOH, CO2, K2CO3, and H3PO4 modify the microstructure of olive stones-derived ACs and how they affect the ACs’ hydrogen storage behavior. The KOH-activation results in the formation of exfoliated graphene sheets, which are not common in lignocellulose-derived ACs. In addition, the KOH-activation forms supermicropores (1–2 nm) that enhance the hydrogen uptake capacity at high pressures (200 bar). The absolute hydrogen adsorption of KOH-activated sample at 200 bar and 77 K is 6.11 wt%, which is among the highest reported for activated carbon samples. The best hydrogen uptake density per surface area of the carbon we obtained is 2.1 × 10−3 wt% m−2 g which is very close to the theoretical maximum hydrogen uptake density on a single graphene sheet. CO2 and H3PO4 activations are more effective on the creation of ultramicropores (d ≤ 0.7 nm) in the carbon matrix. This order of pore size is useful when hydrogen adsorption is performed at sub-atmospheric pressures. Our study suggests that activated carbons with a homogenous pore size distribution centered at narrow range are not as efficient H2 adsorbents as the ACs with a bimodal PSD.
Languageen
PublisherSpringer US
SubjectOlive pomace
Activation process
Biomass
Activated carbons
Adsorption
Hydrogen storage
TitleHow the activation process modifies the hydrogen storage behavior of biomass-derived activated carbons
TypeArticle
ESSN1573-4854
dc.accessType Abstract Only


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