New molecular probe technique for the assessment of ultramicroporous structure
Abstract
Adsorption–desorption isotherms of nitrogen and especially hydrogen at 18 °C and pressures up to 1 atm have been found to be good molecular probes to assess specifically ultramicroporous carbon structures such as constrictions and other restricted regions that are responsible for the molecular sieving property of these carbons. Adsorption on larger pores under these conditions is negligible and does not interfere with the study of ultramicroporous structure. The small low-pressure hystereses found previously (J. E. Koresh, J. Chem. Soc., Faraday Trans., 1993, 89, 935) with nitrogen sorption at 77 K are amplified by sorption of nitrogen and hydrogen at 18 °C.
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