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Coherent analysis of disordered mesoporous adsorbents using small angle X-ray scattering and physisorption experiments

Stoeckel, Daniela ; Wallacher, Dirk ; Zickler, Gerald A. ; Perlich, Jan ; Tallarek, Ulrich ; Smarsly, Bernd M.

Originalveröffentlichung: (2014) Physical Chemistry Chemical Physics 16(14):6583-6592 doi:10.1039/C3CP55072A
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URN: urn:nbn:de:hebis:26-opus-114044

Sammlung: RSC Open Access Artikel
Universität Justus-Liebig-Universit√§t Gie√üen
Institut: Institute of Physical Chemistry
Fachgebiet: Chemie
DDC-Sachgruppe: Chemie
Dokumentart: Aufsatz
Sprache: Englisch
Erstellungsjahr: 2014
Publikationsdatum: 25.03.2015
Kurzfassung auf Englisch: Characterization of mesoporous adsorbents is traditionally performed in terms of the pore size distribution with bulk methods like physisorption and mercury intrusion. But their application relies on assumptions regarding the basic pore geometry. Although novel tools have enabled the quantitative interpretation of physisorption data for adsorbents having a well-defined pore structure the analysis of disordered mesoporosity still remains challenging. Here we show that small angle X-ray scattering (SAXS) combined with chord length distribution (CLD) analysis presents a precise and convenient approach to determine the structural properties of two-phase (solid-void) systems of mesopores. Characteristic wall (solid) and pore (void) sizes as well as surface areas are extracted without the need to assume a certain pore shape. The mesoporous structure of modern, commercially available fully porous and core-shell adsorbent particles is examined by SAXS/CLD analysis. Mean pore size and surface area are compared with results obtained from nitrogen physisorption data and show excellent agreement.
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