Chemical and Pyrolytic Thermogravimetric Characterization of Nigerian Bituminous Coals

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The discovery of new coal deposits in Nigeria presents solutions for nation’s energy crises and prospects for socioeconomic growth and sustainable development. Furthermore, the quest for sustainable energy to limit global warming, climate change, and environmental degradation has necessitated the exploration of alternatives using cleaner technologies such as coal pyrolysis. However, a lack of comprehensive data on physico-chemical and thermal properties of Nigerian coals has greatly limited their utilization. Therefore, the physico-chemical properties, rank (classification), and thermal decomposition profiles of two Nigerian bituminous coals – Afuze (AFZ) and Shankodi-Jangwa (SKJ) – were examined in this study. The results indicate that the coals contain high proportions of C, H, N, S, O and a sufficiently high heating value (HHV) for energy conversion. The coal classification revealed that the Afuze (AFZ) coal possesses a higher rank, maturity, and coal properties compared to the Shankodi-Jangwa (SKJ) coal. A thermal analysis demonstrated that coal pyrolysis in both cases occurred in three stages; drying (30-200 °C), devolatilization (200-600 °C), and char decomposition (600-1000 °C). The results also indicated that pyrolysis at 1000 °C is not sufficient for complete pyrolysis. In general, the thermochemical and pyrolytic fuel properties indicate that the coal from both places can potentially be utilized for future clean energy applications.

[1] OHIMAIN E. I. Can Nigeria generate 30% of her electricity from coal by 2015. International Journal of Energy and Power Engineering. 2014, 3(1), 28-37.

[2] RYEMSHAK S. A., JAURO A. Proximate analysis, rheological properties and technological applications of some Nigerian coals. International Journal of Industrial Chemistry. 2013, 4(1), 1-7.

[3] COAL INDUSTRY ADVISORY BOARD. The Global Value of Coal. Paris, 2012, 29 pp.

[4] KIM S. K., PARK C. Y., PARK J. Y., LEE S., RHU J. H., HAN M. H., YOON S. K., RHEE Y. W. The kinetic study of catalytic low-rank coal gasification under CO2 atmosphere using MVRM. Journal of Industrial and Engineering Chemistry. 2014, 20(1), 356-361.

[5] SPEIGHT, J. G. The chemistry and technology of coal. 3rd ed. Boca Raton: CRC Press, 2013. ISBN 978-1-4398-3648-4.

[6] JAURO A., HORSFIELD B., WILKES H., ABUBAKAR M. B. Hydrocarbon Generating Potentials of Benue Trough Coals. In Chemistry: The Key to our Sustainable Future. New York: Springer, 2013, 75-91. ISBN 978-94-007-7388-2.

[7] JAURO A., OBAJE N., AGHO M., ABUBAKAR M., TUKUR A. Organic geochemistry of Cretaceous Lamza and Chikila coals, upper Benue trough, Nigeria. Fuel. 2007, 4(86), 520-532.

[8] OGALA J., SIAVALAS G., CHRISTANIS K. Coal petrography, mineralogy and geochemistry of lignite samples from the Ogwashi–Asaba Formation, Nigeria. Journal of African Earth Sciences. 2012, 66, 35-45.

[9] OGALA J. E. The geochemistry of lignite from the neogene ogwashi-asaba formation, niger delta basin, southern nigeria. Earth Sciences Research Journal. 2012, 16(2), 151-164.

[10] SONIBARE O. O., HAEGER T., FOLEY S. F. Structural characterization of Nigerian coals by X-ray diffraction, Raman and FTIR spectroscopy. Energy. 2010, 35(12), 5347-5353.

[11] OLAJIRE A., AMEEN A., ABDUL-HAMMED M., ADEKOLA F. Occurrence and distribution of metals and porphyrins in Nigerian coal minerals. Journal of Fuel Chemistry and Technology. 2007, 35(6), 641-647.

[12] SARWAR A., KHAN M. N., AZHAR K. F. The Physicochemical Characterization of a Newly Explored Thar Coal Resource. Energy Sources, Part A: Recovery, Utilization, and Environmental Effects. 2014, 36(5), 525-536.

[13] BJÖRKMAN A. Projects on coal characterization. Fuel. 2001, 80(2), 155-166.

[14] ODEH, A. O. Exploring the potential of petrographics in understanding coal pyrolysis. Energy. 2015, 87, 555-565.

[15] IEA-WEO. World Energy Outlook FactSheet: How will global energy markets evolve to 2035? 2013 [Date Accessed 05.08.2015]]; Available from:

[16] UNITED NATIONS FRAMEWORK CONVENTION ON CLIMATE CHANGE (UNFCC). Adoption of the Paris Agreement: Draft decision -/COP.21. in Conference of the Parties Twenty-first session Paris, 30th November to 11 December 2015. 2015. Paris, France.

[17] NYAKUMA B. B. Physicochemical characterization of low rank Nigerian coals. arXiv preprint arXiv:1506.02068. 2015.

[18] VASSILEV S. V., VASSILEVA C. G., VASSILEV V. S. Advantages and disadvantages of composition and properties of biomass in comparison with coal: An overview. Fuel. 2015, 158, 330-350.

[19] SONIBARE O., EHINOLA O., EGASHIRA R., KEANGIAP L. An investigation into the thermal decomposition of Nigerian Coal. Journal of Applied Sciences. 2005, 5(1), 104-107.

[20] NYAKUMA B. B., AHMAD A., JOHARI A., TUAN ABDULLAH T. A., OLADOKUN O., AMINU Y. D. Non-Isothermal Kinetic Analysis of Oil Palm Empty Fruit Bunch Pellets by Thermogravimetric Analysis. Chemical Engineering Transactions. 2015, 45, 1327-1332.

[21] OLADOKUN O., AHMAD A., ABDULLAH T. A., NYAKUMA B. B., AL-SHATRI A. H., BELLO A. A. Modelling Multicomponent Devolatilization Kinetics of Imperata cylindrica. Chemical Engineering Transactions. 2015, 45, 919-924.

[22] GOSWAMI, D. Y. The CRC Handbook of Mechanical Engineering. CRC Press. 2004, 2688 pp.

[23] GOSWAMI, D. Y., KREITH, F. Energy conversion. CRC Press/Taylor & Francis Group: Boca Raton, FL, 2007, 900 pp.

[24] SCHUETTE C. N. 1931. Quicksilver: U. S. Bur. Mines Bull. 335, 168 pp.

[25] SAIKIA B. K., BORUAH R. K., GOGOI P. K., BARUAH B. P. A thermal investigation on coals from Assam (India). Fuel Processing Technology. 2009, 90(2), 196-203.

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The Journal of VŠB-Technical University of Ostrava, Faculty of Mining and Geology

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