title: Hydrogen and methane sorption in dry and water-loaded multiwall carbon nanotubes.
abstract: Both H2 and CH4 are clean energy sources. Adsorption was considered a measure to enhance their storage, and many efforts have been dedicated to creating novel materials including carbon nanotubes as efficient carriers for them. In order to understand the uptake mechanism and the viability of practical application, eight adsorption isotherms of H2 on a sample of multiwall carbon nanotubes were collected. The heat of adsorption was determined and an isotherm model was presented. Isotherms of CH4 on the same sample were also collected. While the adsorption on dry samples behaves similarly to that of H2, the sorption behavior of CH4 in the water-loaded sample is quite different and five times higher uptake capacity was observed in the wet sample due to the formation of methane hydrates. However, carbon nanotubes are unlikely to be used as an energy carrier due to its limited surface area and pore volume.
authors.affiliation: High Pressure Adsorption Laboratory, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China. zhouli@public.tpt.tj.cn
authors.forename: Li
authors.initials: L
authors.lastname: Zhou
authors.forename: Yan
authors.initials: Y
authors.lastname: Sun
authors.forename: Zhiguan
authors.initials: Z
authors.lastname: Yang
authors.forename: Yaping
authors.initials: Y
authors.lastname: Zhou
mesh_terms: D000327:Adsorption; D006859:Hydrogen / Q000737:chemistry*; D008697:Methane / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D014867:Water / Q000737:chemistry
chemical_list: D037742:Nanotubes, Carbon; D014867:Water; D006859:Hydrogen; D008697:Methane