Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Thermal Oxidative and Non-Oxidative Degradation Behaviour of Afuze Coal

Version 1 : Received: 13 May 2021 / Approved: 14 May 2021 / Online: 14 May 2021 (17:08:42 CEST)

How to cite: Nyakuma, B.B. Thermal Oxidative and Non-Oxidative Degradation Behaviour of Afuze Coal. Preprints 2021, 2021050355 (doi: 10.20944/preprints202105.0355.v1). Nyakuma, B.B. Thermal Oxidative and Non-Oxidative Degradation Behaviour of Afuze Coal. Preprints 2021, 2021050355 (doi: 10.20944/preprints202105.0355.v1).

Abstract

This study presents a preliminary analysis of the chemical and thermal fuel properties of Afuze (AFZ) coal extracted from coalfields in Owan East Local Government Area of Edo State, Nigeria. The chemical properties of AFZ were examined by combined scanning electron microscopy-energy dispersive X-ray (EDX), whereas the thermal properties were deduced by thermogravimetric analysis (TGA) under flash (50 °C/min heating rate) oxidative (combustion) and non-oxidative (pyrolysis) conditions. The microstructure and morphology analysis of AFZ revealed has a compact structure comprising small-to-large, irregular shaped and exfoliated grains with a vitreous appearance typically ascribed to metal elements (Ti and Fe) kaolinite, quartz, and other clay minerals. Chemical analysis revealed carbon, oxygen, aluminium, silicon, sulphur, calcium, titanium, and iron in major and minor (trace) quantities. Thermal analysis under oxidative and non-oxidative conditions revealed degradation occurs in three stages, namely; drying or demineralisation, devolatilization or maceral degradation and the formation of char/coke or ash. Lastly, the findings showed that the temperature range for the oxidative thermal degradation process (338.58 - 756.76 °C) was higher than the non-oxidative process (378.43 - 615.34 °C). This observation can be explained by the exothermic nature of the oxidative (combustion) process, which ensures greater heat supply required to thermally soften or degrade the maceral coal components. Overall, the oxidative process yielded the residual mass (RM = 21.97%) and mass loss (ML = 78.03%). The lower ML (49.03%) but higher RM (50.97%) observed during non-oxidative degradation of AFZ could be ascribed to the largely endothermic nature of the process.

Subject Areas

Thermogravimetry; Thermal Degradation; Behaviour; Afuze; Coal; Nigeria

Comments (0)

We encourage comments and feedback from a broad range of readers. See criteria for comments and our diversity statement.

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.
We use cookies on our website to ensure you get the best experience.
Read more about our cookies here.