Insights into the pore structure of KIT-6 and SBA-15 ordered mesoporous silica - recent advances by combining physical adsorption with mercury porosimetry.

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Details zur Publikation

Autorinnen und Autoren: Guillet-Nicolas R, Ahmad R, Cychosz KA, Kleitz F, Thommes M
Zeitschrift: New Journal of Chemistry
Verlag: Royal Society of Chemistry
Jahr der Veröffentlichung: 2016
Band: 40
Heftnummer: 5
Seitenbereich: 4351-4360
ISSN: 1369-9261


Abstract

A review. The authors have performed a systematic study of N2 adsorption at 77 K and Hg porosimetry expts. at 298 K on highly ordered KIT-6 and SBA-15 silicas exhibiting noticeably different pore structures with pore diams. in the 7-11 nm range. Accurate pore structure anal. was performed by applying appropriate NLDFT methods to the N2 physisorption data. Mercury intrusion/extrusion expts. on KIT-6 silicas (up to 415,000 kPa) showed no collapse of the pore structure quite remarkably. To the best of the authors' knowledge, this is the 1st successful example of Hg porosimetry on KIT-6 materials. Hence, it was possible to use KIT-6 mesoporous mol. sieves for quant. testing the validity of the Washburn equation applied to mercury intrusion for pore size anal. KIT-6 silicas also allowed studying the analogies between condensation/evapn. mechanisms of wetting (N2 at 77 K) and nonwetting (Hg at 298 K) fluids as a function of the pore size confirming the thermodn. consistency between Hg intrusion/extrusion and capillary evapn./condensation. Contrary to KIT-6 silicas, Hg porosimetry expts. on SBA-15 materials of identical pore diams. show an inconsistent behavior in a sense that both reversible Hg intrusion/extrusion data and partial collapse of the pore structure were obsd. The authors' work clearly demonstrates that combining advanced phys. adsorption and Hg porosimetry studies provides a more thorough understanding of textural features and shed some light on the fundamental questions concerning the effect of confinement on the phase behavior of wetting and nonwetting fluids. [on SciFinder(R)]


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Zitierweisen

APA:
Guillet-Nicolas, R., Ahmad, R., Cychosz, K.A., Kleitz, F., & Thommes, M. (2016). Insights into the pore structure of KIT-6 and SBA-15 ordered mesoporous silica - recent advances by combining physical adsorption with mercury porosimetry. New Journal of Chemistry, 40(5), 4351-4360. https://dx.doi.org/10.1039/C5NJ03466C

MLA:
Guillet-Nicolas, Remy, et al. "Insights into the pore structure of KIT-6 and SBA-15 ordered mesoporous silica - recent advances by combining physical adsorption with mercury porosimetry." New Journal of Chemistry 40.5 (2016): 4351-4360.

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