Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials |
| |
| Affiliation: | 1. Université de Lorraine, CNRS, IJL, F-88000, Epinal, France;2. Laboratory of Research: Process Engineering and Industrial Systems (LR11ES54), National School of Engineers of Gabès, University of Gabès, 6026, Gabès, Tunisia;3. Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán, 4. Zaragoza, E-50018, Españal, France;4. Université de Lorraine, CNRS, LEMTA, Vandœuvre-lès-Nancy, F-54500, France;1. Department of Energy Engineering, Gyeongnam National University of Science and Technology (GNTECH), Jinju, 52725, Republic of Korea;2. Fire Protection Laboratory, Chemistry Division, National Institute of Standards, 136, Giza, 12211, Egypt;3. Future Convergence Technology Research Institute, Jinju, 52725, Republic of Korea;1. Department of Environmental Engineering, Engineering Faculty, Karabük University, 78050, Karabük, Turkey;2. Department of Energy Systems Engineering, Technology Faculty, Karabük University, 78050 Karabük, Turkey;1. Key Laboratory for Biobased Materials and Energy of Ministry of Education/Guangdong Provincial Engineering Technology Research Center for Optical Agriculture, College of Materials and Energy, South China Agricultural University, Guangzhou, 510642, China;2. Maoming Branch, Guangdong Laboratory for Lingnan Modern Agriculture, China;1. Institut Jean Lamour, UMR CNRS - Université de Lorraine n°7198, ENSTIB, 27 Rue Philippe Séguin, CS 60036, 88026 Épinal cedex, France;2. Department of Renewable Energies and Environmental Protection, Centro de Investigacion en Materiales Avanzados (CIMAV S.C.), Chihuahua, Chih, Mexico;3. Graduate Department, Facultad de Ciencias Quımicas, Universidad Autonoma de Chihuahua (UACH), Chihuahua, Chih, Mexico;4. Instituto de Carboquímica (ICB-CSIC), Miguel Luesma Castán, 4, Zaragoza, E-50018, Spain |
| |
| Abstract: | The effect of heteroatoms on hydrogen adsorption properties of activated and hybrid carbon materials is critically described. For that purpose, olive stones were activated chemically with KOH, and subsequently washed or not, and oxidised with ozone or not. Olive stones were also activated physically with CO2. A series of activated carbons prepared by chemical activation of sucrose was also investigated for comparison. As a result, many activated carbons with different pore-size distributions, surface areas, average micropore widths, oxygen contents and amounts of mineral matter could be compared. All were thoroughly characterised by adsorption of N2, CO2 and H2O, elemental analysis, XPS, thermogravimetry, and adsorption of H2 at different pressures. Many correlations between textural parameters, composition and adsorption properties could be evidenced, and were critically discussed. We show that the hydrogen uptake at 77 K is controlled by the following parameters, listed by decreasing order of importance: specific surface area, average micropore size, surface chemistry and shape of the pore size distribution. At room temperature (i.e., at 298 K), the adsorbed hydrogen uptake was in the range of 0.19–0.42 wt %; the presence of large amounts of alkali metals can further improve the hydrogen adsorption properties, but surface chemistry still has a major influence, especially through the acidic surface functions. |
| |
| Keywords: | Activated carbons Surface chemistry Hydrogen adsorption Acidic groups Polarised physisorption |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
