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All Journal Indonesian Journal of Chemistry
Nawi, Nazmi Mat
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Chemical Engineering, Chemistry & Bioengineering Chemistry

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Enhancing the Energy Content of Melawan Coal through H2SO4 and NaOH Demineralization Ngulde, Aliyu Buba; Wan Ab Karim Ghani, Wan Azlina; Nawi, Nazmi Mat; Rashid, Umer; Silas, Kiman
Indonesian Journal of Chemistry Vol 25, No 3 (2025)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.100059

Abstract

The objective of this study was to compare the calorific values, proximate analysis, ultimate analysis, SEM-EDX, XRF, FTIR spectroscopy, and TGA of the control feedstock and coal samples treated with different acid-alkali formulations. We also evaluated the effectiveness of the acid and alkali treatments, individually and in combination, on the structural and chemical properties of Melawan coal. The TGA results indicated that all treated coal samples showed reduced weight loss compared to raw coal, indicating the removal of minerals and volatile components owing to the treatment processes. Based on the DTG curve, the combination treatment (acid followed by base) somewhat stabilizes the coal, leading to a broader and less intense peak. EDS analysis revealed that both H2SO4 and NaOH treatments, individually and in combination, significantly altered the elemental composition of the coal. According to FTIR analysis, the presence of carbonyl groups can affect the performance of coal in processes such as gasification, pyrolysis, or combustion, making it a key functional group of interest for evaluating post-treatment coal properties. The removal of mineral impurities can lead to a higher calorific value, making coal more suitable for energy generation applications.
Co-Authors Ngulde, Aliyu Buba Rashid, Umer Silas, Kiman Wan Ab Karim Ghani, Wan Azlina