129Xe NMR spectroscopy of adsorbed xenon: Possibilites for exploration of microporous carbon materials |
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| Authors: | K. V. Romanenko O. B. Lapina X. Py J. Fraissard |
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| Affiliation: | (1) Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences, pr. Lavrent’eva 5, Novosibirsk, 630090, Russia;(2) CNRS-PROMES, Processes Materials and Solar Energy Laboratory, Rambla de la Thermodynamique, Tecnosud, 66100, Perpignan Cedex, France;(3) Laboratoire de Physique Quantique, UMR CNRS 7142, Ecole Supérieure de Physique et de Chimie Industrielles (ESPCI), 75231 Paris Cedex 05, France |
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| Abstract: | Despite the extensive use of 129Xe NMR for characterization of high surface-to-volume porous solids, particularly zeolites, this method has not been widely used to explore the properties of microporous carbon materials. In this study, commercial amorphous carbons of different origin (produced from different precursors) and a series of activated carbons obtained by successive cyclic air oxidation/pyrolysis treatments of a single precursor were examined. Models of 129Xe chemical shift as a function of local Xe density, mean pore size, and temperature are discussed. The virial coefficient arising from binary xenon collisions, σXe-Xe, varied linearly with the mean pore size given by N2 adsorption analysis; σXe-Xe appeared to be a better probe of the mean pore size than the chemical shift extrapolated to zero pressure, σS. |
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