A quantitative online analysis of gases evolved during biochar pyrolysis by TG-MS coupled to micro gas chromatography
The paper presents an in-depth study on the dynamics of formation of permanent gases (H2, CO, CO2) and light hydrocarbon gases (CH4, C2H4, C2H6) during biochar pyrolysis. The study employs a TG-MS system coupled to a micro gas chromatograph (micro-GC). Short analysis period allows for qualitative and quantitative online evaluations of gases released every minute during the TG-MS analysis. Six biochar samples derived from pinewood and wheat straw at torrefaction and carbonization temperatures of 300, 400, and 500 °C were investigated, and the MS and GC data were compared. The findings reveal that the thermal decomposition of lignin is the key driver of H2 production, as hydrogen formation starts at temperatures ranging from 550 to 600 °C across all samples. The analysis also shows that with an increase in lignin content, the yield of hydrogen rises as well. For biochars produced at 400 and 500 °C, hydrogen yield is 2.7–3.4 times higher than for biochars produced at 300 °C. CO and CO2 yields are only slightly dependent on biochar preparation temperature; however, for all wheat straw biochars, CO2 yields are nearly twice as high. For methane and C2 hydrocarbons, the maximum yield is observed for biochars obtained at 400 °C. © 2026 Elsevier B.V. All rights are reserved, including those for text and data mining, AI training, and similar technologies.
Библиографическая ссылка
Penzik M.V., Gubiy E.V., Badenko V.V., Kozlov A.N. A quantitative online analysis of gases evolved during biochar pyrolysis by TG-MS coupled to micro gas chromatography // Thermochimica Acta. Vol.762. No.180349. 2026. DOI: 10.1016/j.tca.2026.180349
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