Abstract
The so-called turbostatic structure of carbons in coal with randomly oriented stacking of the lamellae (graphene) produces intense peaks, which are the dominant features in its X-ray diffraction profiles. The diffractogram may be conveniently divided into two regions of reciprocal space, the medium S region (1 < S < 3 Å) and a high S region (S > 3 Å) where S = 4πλ −1sinθ. To better understand the molecular level structure of high sulphur Assam coal, two coal samples (Tirap-1 and Tirap-2) from Tirap colliery of Makum coalfield, Assam (India) has been interpreted in this study by using the X-ray diffraction profiles. Random layered (graphene) structural parameters of these coals were determined by using X-ray diffraction technique, which showed that the L a and L c are 64·99 Å and 22·63 Å for Tirap-2 and 55·54 Å and 23·80 Å for that of Tirap-1 coals respectively. The position of γ band was found to be at 4·34 Å and 4·13 Å for Tirap-2 and Tirap-1 coals respectively. The number of layers and average number of carbon atoms (N) per aromatic graphene were found to be 21 and 8 for both the coal samples. Proximate, ultimate and ash analysis of the two coal samples were also carried out in this investigation.
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References
Cartz L, Diamond R and Hirsch P B 1956 Nature 117 500
Wertz D L 1995 Fuel 74 1431
Watanable I, Sakanishi K and Mochida I 2002 Energy and Fuel 16 18
Mochida I and Sakanishi K 2000 Fuel 79 221
Ruland W 1959 Acta. Crystallogr. 12 679
Iwashita N and Inagaki M 1993 Carbon 31 1107
Klug P H and Alexander L E 1974 X-ray diffraction procedures (New York: John Wiley & Sons)
Lowry H H (ed.) 1963 Chemistry of coal utilizations (New York: John Wiley & Sons)
Diamond R Acta Crystallogr. 1958 11 129
Nelson J B 1954 Fuel 33 153
Hirsch P B 1954 Proc. Roy. Soc. (London) A226 143
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Saikia, B.K., Boruah, R.K. & Gogoi, P.K. A X-ray diffraction analysis on graphene layers of Assam coal. J Chem Sci 121, 103–106 (2009). https://doi.org/10.1007/s12039-009-0012-0
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DOI: https://doi.org/10.1007/s12039-009-0012-0