Physicochemical,mineralogy,and thermo-kinetic characterisation of newly discovered Nigerian coals under pyrolysis and combustion conditions
Bemgba B.Nyakuma1
Aliyu Jauro2
Segun A.Akinyemi3
Hasan M.Faizal4
Mohammed B.Nasirudeen5
Muhammad Ariff H.M.Fuad4
Olagoke Oladokun1
1.School of Chemical and Energy Engineering,Faculty of Engineering,Universiti Teknologi Malaysia,81310 Skudai,Johor,Malaysia2.National Centre for Petroleum Research and Development,Abubakar Tafawa Balewa University,P.M.B 0248,Bauchi,Bauchi State,Nigeria3.Department of Geology,Faculty of Science,Ekiti State University,P.M.B 5363,Ado-Ekiti,Ekiti State,Nigeria4.School of Mechanical Engineering,Faculty of Engineering,Universiti Teknologi Malaysia,81310 Skudai,Johor,Malaysia5.Department of Chemistry,Faculty of Science,Federal University of Lafia,P.M.B 146,Lafia,Nasarawa State,Nigeria
摘要：In this study,the physicochemical,microstructural,mineralogical,thermal,and kinetic properties of three newly discovered coals from Akunza (AKZ),Ome (OME),and Shiga (SHG) in Nigeria were examined for potential energy recovery.Physicochemical analysis revealed high combustible but low levels of polluting elements.The higher heating values ranged from 18.65 MJ/kg (AKZ) to 26.59 MJ/kg (SHG).Microstructure and mineralogical analyses revealed particles with a rough texture,surface,and glassy lustre,which could be ascribed to metals,quartz,and kaolinite minerals.The major elements (C,O,Si,and Al),along with minor elements (Ca,Cu,Fe,K,Mg,S,and Ti) detected are associated with clays,salts,or the porphyrin constituents of coal.Thermal analysis showed mass loss (ML) ranges from 30.51％ to 87.57％ and residual mass (RM) from 12.44％ to 69.49％ under combustion (oxidative) and pyrolysis (non-oxidative) TGA conditions due to thermal degradation of organic matter and macerals (vitrinite,inertinite and liptinite).Kinetic analysis revealed the coals are highly reactive under the oxidative and non-oxidative conditions based on the Coats-Redfern Model.The activation energy (Ea) ranged from 23.81 to 89.56 kJ/mol,whereas the pre-exponential factor (ko) was from 6.77 × 10-4/min to 1.72 × 103/min under pyrolysis and combustion conditions.In conclusion,the coals are practical feedstocks for either energy recovery or industrial applications.
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论文发表日期：2021-12-30
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：20( 697-716 )
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