High-Resolution N2 Adsorption Isotherms at 77.4 K: Critical Effect of the He Used During Calibration

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Title: High-Resolution N2 Adsorption Isotherms at 77.4 K: Critical Effect of the He Used During Calibration
Authors: Silvestre-Albero, Joaquín | Silvestre Albero, Ana | Llewellyn, Philip L. | Rodríguez Reinoso, Francisco
Research Group/s: Materiales Avanzados
Center, Department or Service: Universidad de Alicante. Departamento de Química Inorgánica | Universidad de Alicante. Instituto Universitario de Materiales
Keywords: High-resolution | N2 adsorption isotherms
Knowledge Area: Química Inorgánica
Issue Date: 25-Jul-2013
Publisher: American Chemical Society
Citation: The Journal of Physical Chemistry C. 2013, 117(33): 16885-16889. doi:10.1021/jp405719a
Abstract: Accurate characterization of the microporous structure in porous solids is of paramount importance for several applications such as energy and gas storage, nanoconfinement reactions, and so on. Among the different techniques for precise textural characterization, high-precision gas adsorption measurement of probe molecules at cryogenic temperatures (e.g., N2 at 77.4 K and Ar at 87.3 K) is the most widely used, after appropriate calibration of the sample holder with a probe gas, which does not experience physisorption processes. Although traditionally helium has been considered not to be adsorbed in porous solids at cryogenic temperatures, here we show that even at 77.4 K (high above its boiling temperature, 4 K) the use of He in the calibration step can give rise to erroneous interpretations when narrow micropores/constrictions are present.
Sponsor: Authors acknowledge financial support from the MICINN (project PLE2009-0052) and Generalitat Valenciana (PROMETEO/2009/002).
URI: http://hdl.handle.net/10045/39533
ISSN: 1932-7447 (Print) | 1932-7455 (Online)
DOI: 10.1021/jp405719a
Language: eng
Type: info:eu-repo/semantics/article
Rights: © 2013 American Chemical Society
Peer Review: si
Publisher version: http://dx.doi.org/10.1021/jp405719a
Appears in Collections:INV - LMA - Artículos de Revistas

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