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- 저자 : Armandi, M. (검색결과 1 건)
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Study of hydrogen physisorption on nanoporous carbon materials of different origin
Armandi, M.,Bonelli, B.,Cho, K.,Ryoo, R.,Garrone, E. Elsevier 2011 INTERNATIONAL JOURNAL OF HYDROGEN ENERGY - Vol.36 No.13
<P><B>Abstract</B></P><P>Hydrogen adsorption capabilities of different nanoporous carbon, i.e. amorphous carbons obtained by chemical activation (with KOH) of a sucrose-derived char previously ground by ball milling and carbon replicas of NH<SUB>4</SUB>-Y and mesocellular silica foam (MSU-F) inorganic templates, were measured and correlated to their porous properties. The porous texture of the prepared carbon materials was studied by means of N<SUB>2</SUB> and CO<SUB>2</SUB> adsorption isotherms measured at −196°C and 0°C, respectively. Comparison with nanoporous carbons obtained without pre-grinding the sucrose-derived char <ce:cross-ref refid='bib12'>[12]</ce:cross-ref> shows that the ball milling procedure favours the formation of highly microporous carbon materials even at low KOH loadings, having a beneficial effect of the interaction between the char particles and the activating agent. Hydrogen adsorption isotherms at −196°C were measured in the 0.0–1.1MPa pressure range, and a maximum hydrogen adsorption capacity of 3.4 wt.% was obtained for the amorphous carbon prepared by activation at 900°C with a KOH/char weight ratio of 2. Finally, a linear dependence was found between the maximum hydrogen uptake at 1.1MPa and the samples microporous volume, confirming previous results obtained at −196°C and sub-atmospheric pressure <ce:cross-ref refid='bib12'>[12]</ce:cross-ref>.</P>
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