Sorption and Pore Condensation Behavior of Nitrogen, Argon, and Krypton in Mesoporous MCM-48 Silica Materials.
Thommes M, Koehn R, Froeba M (2000)
Publication Type: Journal article, Original article
Subtype: other
Publication year: 2000
Journal
Publisher: American Chemical Society
Book Volume: 104
Pages Range: 7932-7943-7943
Journal Issue: 33
DOI: 10.1021/jp994133m
Abstract
Results of a systematic study on the sorption- and phase behavior of nitrogen, argon, and krypton at 77 and 87 K in different pristine mesoporous MCM-48 silica phases (BJH pore diams. 2-3 nm) and MCM-48 silica/iron(III) host compd., which consists of two interwoven, but unconnected three-dimensional pore systems are presented. Different methods (e.g., BET, BJH, SF) were used to analyze nitrogen (77 K) and argon (87 K) sorption isotherms in order to characterize the MCM-48 silica materials with respect to surface area, pore vol. and pore diam. In contrast to nitrogen, argon, and krypton sorption isotherms on all MCM-48 silica materials reveal phase transitions accompanied by sorption hysteresis of type H1 (IUPAC classification) down to temps. T well below the bulk triple-point temp. TR, i.e., 87 K (TR - T ≈ 28.5 K) in the case of krypton and 77 K (TR - T ≈ 6.5 K) in the case of argon. Details of the sorption hysteresis depend on temp. and pore size, e.g., with increasing temp. and decreasing pore size a shrinkage of the hysteresis loops is obsd. In contrast to the argon/MCM-48 silica system, argon sorption isotherms at TR - T ≈ 6.5 K in controlled-pore glass of BJH pore diam. ca. 16 nm reveal no pore condensation and hysteresis, indicating that in such wide pores the pore condensation line does not extend down to this temp. for pressures up to the corresponding bulk sublimation pressure. [on SciFinder(R)]
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Germany (DE)How to cite
APA:
Thommes, M., Koehn, R., & Froeba, M. (2000). Sorption and Pore Condensation Behavior of Nitrogen, Argon, and Krypton in Mesoporous MCM-48 Silica Materials. Journal of Physical Chemistry B, 104(33), 7932-7943-7943. https://dx.doi.org/10.1021/jp994133m
MLA:
Thommes, Matthias, Ralf Koehn, and Michael Froeba. "Sorption and Pore Condensation Behavior of Nitrogen, Argon, and Krypton in Mesoporous MCM-48 Silica Materials." Journal of Physical Chemistry B 104.33 (2000): 7932-7943-7943.
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