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• W3003649575 endingPage "104781" @default.
• W3003649575 startingPage "104781" @default.
• W3003649575 abstract "Thermogravimetry coupled with electron impact mass spectrometry (TG-EI MS) was used to investigate the evolutions of gases and small molecular weight oxygenates during the pyrolysis of a raw lignite and a potassium (K)-impregnated lignite. By clarifying the effects of ionization on the fragmentations of various compounds, it was found that a low ionizing energy of 20 eV was better for detecting oxygenates. The study further proposed a unique approach of the installment of a cold trap between the TG-MS interfaces. This vapor trapping approach is useful to distinguish between some compounds of equal mass in terms of their different boiling points. The real-time release of various oxygenates during the pyrolysis of the raw lignite and the K-impregnated lignite were detected. It was found that some highly volatile oxygenates such as formic acid (46 m/z), acetone (58 m/z) and butanone (72 m/z) started to release at a temperature of 200 °C or lower. Many oxygenates such as furan (68 m/z), methylfuran (82 m/z), cyclopentenone (82 m/z), cyclopentanone (84 m/z), furfural (96 m/z), dimethylfuran (96 m/z), cyclohexenone (96 m/z) and dimethoxyphenol (154 m/z) could be explained as the products degraded from the preserved woody components in this low-maturity lignite. The K impregnation overall facilitated the formations of oxygenates, while it had an inhibitory effect on the formation of CO and an insignificant effect on the formations of some oxygenates such as acetic acid and phenol. The curves of differential thermogravimetry (DTG) were deconvoluted to correspond to the staged release characteristics of main gases and various oxygenates." @default.
• W3003649575 created "2020-02-07" @default.
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• W3003649575 date "2020-03-01" @default.
• W3003649575 modified "2023-10-13" @default.
• W3003649575 title "Thermogravimetric-mass spectrometric characterization of thermal decomposition of lignite with attention to the evolutions of small molecular weight oxygenates" @default.
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• W3003649575 doi "https://doi.org/10.1016/j.jaap.2020.104781" @default.
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