title: Textural characterization of micro- and mesoporous carbons using combined gas adsorption and n-nonane preadsorption.
abstract: Porous carbon and carbide materials with different structures were characterized using adsorption of nitrogen at 77.4 K before and after preadsorption of n-nonane. The selective blocking of the microporosity with n-nonane shows that ordered mesoporous silicon carbide material (OM-SiC) is almost exclusively mesoporous whereas the ordered mesoporous carbon CMK-3 contains a significant amount of micropores (~25%). The insertion of micropores into OM-SiC using selective extraction of silicon by hot chlorine gas leads to the formation of ordered mesoporous carbide-derived carbon (OM-CDC) with a hierarchical pore structure and significantly higher micropore volume as compared to CMK-3, whereas a CDC material from a nonporous precursor is exclusively microporous. Volumes of narrow micropores, calculated by adsorption of carbon dioxide at 273 K, are in linear correlation with the volumes blocked by n-nonane. Argon adsorption measurements at 87.3 K allow for precise and reliable calculation of the pore size distribution of the materials using density functional theory (DFT) methods.
authors.affiliation: Department of Inorganic Chemistry, Dresden University of Technology, Bergstrasse 66, D-01062 Dresden, Germany.
authors.forename: Martin
authors.initials: M
authors.lastname: Oschatz
authors.forename: Lars
authors.initials: L
authors.lastname: Borchardt
authors.forename: Soledad
authors.initials: S
authors.lastname: Rico-Francés
authors.forename: Francisco
authors.initials: F
authors.lastname: Rodríguez-Reinoso
authors.forename: Stefan
authors.initials: S
authors.lastname: Kaskel
authors.forename: Joaquín
authors.initials: J
authors.lastname: Silvestre-Albero