English   español  
Please use this identifier to cite or link to this item: http://hdl.handle.net/10261/221004
Share/Impact:
Statistics
logo share SHARE logo core CORE   Add this article to your Mendeley library MendeleyBASE

Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE
Exportar a otros formatos:

Title

Oxygen-promoted hydrogen adsorption on activated and hybrid carbon materials

AuthorsSchaefer, Sébastien; Jeder, Asma; Sdanghi, Giuseppe; Philippe Gadonneix; Abdedayem, Asma; Izquierdo Pantoja, María Teresa CSIC ORCID ; Ouederni, Abdelmottaleb; Celzard, Alain; Fierro, Vanessa
KeywordsActivated carbons
Surface chemistry
Hydrogen adsorption
Acidic groups
Polarised physisorption
Issue Date30-Sep-2020
PublisherElsevier
CitationInternational Journal of Hydrogen Energy 45(55): 30767-30782 (2020)
AbstractThe 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.
Description13 figures.-- Supplementary information available.-- © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher version (URL)http://dx.doi.org/10.1016/j.ijhydene.2020.08.114
URIhttp://hdl.handle.net/10261/221004
DOIhttp://dx.doi.org/10.1016/j.ijhydene.2020.08.114
ISSN0360-3199
Appears in Collections:(ICB) Artículos
Files in This Item:
File Description SizeFormat 
HE-D-20-02876_unmarked_repositorio CSIC.pdf Embargoed until September 30, 2022Artículo principal686,46 kBAdobe PDFThumbnail
View/Open    Request a copy
1-s2.0-S0360319920331189-mmc1.docxInformación suplementaria1,69 MBMicrosoft Word XMLView/Open
Show full item record
Review this work
 

Related articles:


WARNING: Items in Digital.CSIC are protected by copyright, with all rights reserved, unless otherwise indicated.