2.細孔内凝縮水および細孔表面水酸基をプローブとする水含有石炭の細孔構造評価

概要

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As-received and partially dried Yallourn coal (YL) and Beulah Zap coal (BZ) were subjected to a magnetic resonance relaxation analysis employing a Carr-Purcel/Meiboom-Gill (CPMG) pulse sequence. The analysis detected the protons undergoing transverse relaxation with different time constants, arisen from bulk water, pore water and coal hydroxylic groups, respectively. The relaxation of the pore water, described by that of a single component, indicated the coexistence of freezable bound water and non-freezable water in the individual pores, thus suggesting no micropores involving the latter type of water exclusively. Based on a theory on the relaxation of liquid in porous systems, the relaxation characteristics of pore water and hydroxylic groups were further analyzed. Assumin slit-like pores, their averaged dimensions were estimated as 2.9-3.1nm for YL and 2.2nm for BZ, unless the bound water is removed.
2000-09-28