Abstract
Two coal samples collected from Makum coal field, Assam, India were studied by XRD and FT-IR techniques. The X-ray diffractogram shows the existence of some crystalline carbons in Assam coals as proven by the appearance of peaks. The radial distribution functional (RDF) method was applied for the determination of structural aspects of the coals. The study indicates that the coals are lignite in type and there is no evidence of graphite-like structures. The maximum in the G(r) plots of function of radial distribution of atoms (FRDA) relates to different distances between carbon atoms of aliphatic chains. The first significant maximum relates to the C-C bond (type C-CH=CH-C), the second maximum relates to the distance between carbon atoms of aliphatic chains that are located across one carbon atom. The curve intensity profiles obtained from FRDA show quite regular molecular packets for this coal. The coals were found to be lignite in nature. FT-IR study shows the presence of aliphatic carbon, C=O and C-O stretching associated with -OH and -NH stretching vibrations. Kaolinite and quartz were also found to be major minerals in Assam coals by FTIR spectroscopy. The difference in intensities of carbonyl groups of the coal samples is likely to relate with the rank.
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References
Alvarez A G, Molina-Sabio M and Rodriguez-Reinoso F 1998 Carbon 36 67
Barooah P K and Baruah M K 1996 Fuel Process. Technol. 46 85 (references therein)
Baruah B P, Saikia B K, Kotoky P and Rao P G 2006 Energy & Fuel 20 1550
Blayden H E, Gibson J and Riley H L 1944 Proc. conf. on ultrafine structure of coals and cokes (London: BCURA) p. 176
Cartz L and Hirsch P B 1960 Proc. R. Soc. (London) A252 557
Cartz L, Diamond R and Hirsch P B 1956 Nature 117 500
Cooke N E, Fuller M and Gaikwad R P 1986 Fuel 65 1254
Das T K 2001 Fuel 80 489
Diamond R 1958 Acta Crystallogr. 11 129
Elliot Martin A (ed.) 1981 Chemistry of coal utilization, second supplementary volume (New York: John Wiley & Sons) p. 89
Given P N, Davis A, Kuchn D, Painter P and Spackman W 1985 Int. J. Coal Geol. 5 247
Gorbaty M L and Ouchi K 1981 Coal structure (Washington, DC: American Chemical Society) pp 1–2
Grigoriew G 1990 Fuel 69 840
Haenel M W 1992 Fuel 71 1211
Himus G W (ed.) 1954 Fuel testing, laboratory methods in fuel technology (London: Leonard Hill) pp 67–78
Hirsch P B 1954 Proc. R. Soc. (London) A226 143
Iino M 2002 Energy & Fuel 16 1
Karr C Jr. 1978a Analytical methods for coal and coal products (New York: Academic Press) Ch. 6, Vol. I
Karr C Jr. 1978b Analytical methods for coal and coal products (New York: Academic Press) Vol. II
Kashimura N, Hayashi J, Li Cz, Sathe C and Chiba T 2004 Fuel 83 97
Klug P H and Alexander L E 1974 X-ray diffraction procedure (New York: Wiley Interscience, John Wiley) p. 791
Kruh R F 1962 Chem. Rev. 62 319
Mahadevan C 1929 Fuel 8 462
Mahadevan C 1930 Fuel 9 574
Maity S and Mukharjee P 2006 Curr. Sci. 91 337
Marzec A 2002 Fuel Process. Technol. 77–78 25
Myers R A (ed.) 1981 Coal handbook (New York: Marcel Dekker Inc.) pp 1–2
Myers R A (ed.) 1982 Coal structure (New York: Academic Press) p. 8
Mitra G B 1953 Acta Crystallogr. 6 610
Nelson J B 1954 Fuel 33 381
Ruland W 1968 Chemistry and physics of carbon (ed.) P C Walker Jr. (New York: Marcel Dekker Inc.) Vol. 4, p. 1
Saikia B K, Boruah R K, Baruah B P and Gogoi P K 2005 34th National seminar on crystallography (Guwahati: Gauhati University) p. 63
Scheinman F 1970 An introduction to spectroscopic methods for the identification of organic compounds (Oxford: Pergamon Press) Vol. 1
Schoening F R L 1982 Fuel 61 695
Schoening F R L 1983 Fuel 62 1315
Speight J G 1973 Appl. Spectrosc. Rev. 5 211
Vasin I O and Gladyshera G I 1983 Kristallographie 28 446
Vogel A I 1969 A textbook of quantitative inorganic analysis, including elementary analysis (New York, London: Longman)
Wertz D L 1998 Fuel 77 43
Wertz D L and Bisell M 1994 Energy & Fuel 8 613
Wertz D L and Bisell M 1995 Fuel 74 1431
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Saikia, B.K., Boruah, R.K. & Gogoi, P.K. XRD and FT-IR investigations of sub-bituminous Assam coals. Bull Mater Sci 30, 421–426 (2007). https://doi.org/10.1007/s12034-007-0068-8
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DOI: https://doi.org/10.1007/s12034-007-0068-8