石炭中の無機成分の構造 : 固体NMRによる考察(<特集>黒もの分析の進歩)

概要

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High resolution solid-state NMR spectroscopy has been applied to structural analysis of inorganic matter in natural coals. Clay minerals and silica are distinguished and quantified by using ^<29>Si (I=-1/2) Magic-Angle-Spinning (MAS) NMR, however, peaks of some kinds of minerals are not separated because of relatively broad lines and their close chemical shifts. We have also demonstrated that ^<27>Al (I=-5/2) Multiple-Quantum (MQ) MAS NMR with the high magnetic field is a very effective for characterization of inorganic matter (minerals and clay minerals) in coals, because it averages out the second-order quadrupolar broadening. Natural coals are able to be categorized to several groups according to the minerals types. A simple prediction approach of the minerals types in coals have been proposed from the total contents of silicon and aluminum. In addition, the relationship between minerals types and the mature of carbon in coals have been discussed.
一般社団法人日本エネルギー学会の論文
2009-02-20