Kidena, KohMurata, SatoruArtok, LeventNomura, Masakatsu04.01. Department of Chemistry04. Faculty of Science01. Izmir Institute of Technology2016-04-182016-04-181999Kidena, K., Murata, S., Artok, L., and Nomura, M. (1999). Estimation of the average aromatic cluster size based on solid-state NMR measurement of coal. Nihon Enerugi Gakkaishi/Journal of the Japan Institute of Energy, 78(10), 874-876. doi:10.3775/jie.78.8690916-87530916-87531882-6121http://doi.org/10.3775/jie.78.869https://hdl.handle.net/11147/4513This article is the original language of Japanese.Measurements of solid-state NMR of eight Argonne Premium Coal Samples were conducted to estimate the average aromatic cluster size in these coals. Firstly, the carbon distribution was obtained from SPE/MAS 13C-NMR. Secondary, 1H-CRAMPS NMR spectra gave the hydrogen aromaticity of coal. Combination use of the hydrogen aromaticity and elemental analysis data could afford the amount of tertiary aromatic carbon. The parameter of χ b, the mole fraction of aromatic bridgehead carbons in all aromatic carbons, could be derived from above NMR data and elemental analysis of coal. χ b is directly correlated to the number of aromatic carbon atoms per aromatic cluster, C. In this study, the value of C varied from 10 (corresponding to the size of naphthalene) for Beulah-Zap and Wyodak coals to 23 (corresponding to the size of coronene) for Pocahontas No. 3 coal.otherinfo:eu-repo/semantics/openAccessCarbonHydrogenNuclear magnetic resonance spectroscopyAverage aromatic cluster sizeCoalArticle2-s2.0-003335597910.3775/jie.78.86910.3775/jie.78.869