A Kentucky coal sample treated by microwave irradiation (MI) combined with sodium hydroxide solution was performed using a thermo-gravimetric analyzer (TGA) coupled to a Fourier transform infrared spectrometer (FTIR). The combustion properties and structural changes of coal under different conditions were investigated and compared. The results show that the desulfurization efficiency of coal samples increases with the increase of sodium hydroxide solution concentration. Microwave irradiation can significantly improve the desulfurization efficiency. The whole combustion process of the treated coal sample becomes longer; the combustion performance becomes worse. The total mass loss of coal treated samples is significantly reduced, and the temperature corresponding to the maximum weight loss rate decreases with the increase of sodium hydroxide concentration. The infrared spectra of the coal samples treated with microwave and 5% sodium hydroxide solution were basically unchanged, while the O containing groups and aromatic C-H groups increased in the coal samples treated with 20% sodium hydroxide solution.

中文翻译：

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微波与氢氧化钠溶液混合处理对煤燃烧特性的影响

使用与傅里叶变换红外光谱仪 (FTIR) 耦合的热重分析仪 (TGA) 对通过微波辐射 (MI) 和氢氧化钠溶液处理的肯塔基煤样品进行分析。研究比较了不同条件下煤的燃烧特性和结构变化。结果表明，煤样的脱硫效率随着氢氧化钠溶液浓度的增加而增加。微波辐照可显着提高脱硫效率。处理后的煤样整个燃烧过程变长；燃烧性能变差。煤处理样品的总质量损失显着降低，最大失重率对应的温度随着氢氧化钠浓度的增加而降低。微波和5%氢氧化钠溶液处理的煤样的红外光谱基本不变，而20%氢氧化钠溶液处理的煤样中含O基团和芳香族CH基团增加。