Study of hydrogen physisorption on nanoporous carbon materials of different origin

• Published in: International journal of hydrogen energy Vol. 36; no. 13; pp. 7937 - 7943
• Main Authors: Armandi, M., Bonelli, B., Cho, K., Ryoo, R., Garrone, E.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01-07-2011; Elsevier
• Subjects: Activation; Adsorption; Alternative fuels. Production and utilization; Applied sciences; Carbon; Carbon replicas; CO 2 adsorption; Combustion; Energy; Exact sciences and technology; Fuels; Hydrogen; Hydrogen physisorption; Nanocomposites; Nanomaterials; Nanoporous carbon materials; Nanostructure; Texture; CO 2 adsorption; Nanoporous carbon materials; Hydrogen physisorption; Carbon replicas; adsorption; Sucrose; Hydrogen; Carbon dioxide; Adsorption isotherm; Activation; CO; Physisorption; Silica; Comparative study
• ISSN: 0360-3199; 1879-3487
• DOI: 10.1016/j.ijhydene.2011.01.049

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
4-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
2 and CO
2 adsorption isotherms measured at −196
°C and 0
°C, respectively. Comparison with nanoporous carbons obtained without pre-grinding the sucrose-derived char
[12] 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 0.0–1.1
MPa 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 1.1
MPa and the samples microporous volume, confirming previous results obtained at −196
°C and sub-atmospheric pressure
[12].