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Open AccessArticle

Thermochemical Conversion of Biomass in the Presence of Molten Alkali-Metal Carbonates under Reducing Environments of N2 and CO2

School of Chemical Engineering, University of Newcastle, Callaghan, NSW 2308, Australia
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Energies 2020, 13(20), 5395; https://doi.org/10.3390/en13205395
Received: 15 September 2020 / Revised: 7 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
(This article belongs to the Special Issue Thermochemical Conversion of Biomass and Waste)
The impact of N2 and CO2 atmospheres on the interaction between Eucalyptus pilularis biomass and a ternary molten carbonate eutectic (Li2CO3: Na2CO3: K2CO3) has been investigated at 600 °C and 900 °C. For lower temperature conversion under CO2, prevention of volatile release in the eutectic treated biomass is slightly higher than under N2 injection; however, similar bubble-shaped morphology of the remnant char is observed under both carrier gases. By increasing the temperature to 900 °C under CO2, the reverse Boudouard reaction begins to consume carbon fuel, while molten carbonate gasification also accelerates the reaction to a lower temperature set point (shifted from ~735 °C to ~640 °C). The mass loss of carbonate under CO2 and N2 at 900 °C is 0 (negligible) and 18 wt.%, respectively. In the absence of carbon particles, the decomposition of carbonate to M2O (l) and CO2 (g), as well as molten salt vaporization, are the sole potential routes of weight loss in an inert gas. Previous observations of biomass and eutectic mixture thermochemical conversion under N2 have suggested carbon/carbonate gasification is dominant at elevated temperatures, with production of CO expected. However, analysis of gas chromatography (GC) suggests that carbon/carbonate gasification is the weaker pathway by producing only 7 vol.% of CO, compared with molten carbonate decomposition with 27 vol.% CO2 emission for this system. View Full-Text
Keywords: slow pyrolysis; Boudouard reaction; carbonate gasification; ternary eutectic; biomass slow pyrolysis; Boudouard reaction; carbonate gasification; ternary eutectic; biomass
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MDPI and ACS Style

Jalalabadi, T.; Moghtaderi, B.; Allen, J. Thermochemical Conversion of Biomass in the Presence of Molten Alkali-Metal Carbonates under Reducing Environments of N2 and CO2. Energies 2020, 13, 5395. https://doi.org/10.3390/en13205395

AMA Style

Jalalabadi T, Moghtaderi B, Allen J. Thermochemical Conversion of Biomass in the Presence of Molten Alkali-Metal Carbonates under Reducing Environments of N2 and CO2. Energies. 2020; 13(20):5395. https://doi.org/10.3390/en13205395

Chicago/Turabian Style

Jalalabadi, Tahereh; Moghtaderi, Behdad; Allen, Jessica. 2020. "Thermochemical Conversion of Biomass in the Presence of Molten Alkali-Metal Carbonates under Reducing Environments of N2 and CO2" Energies 13, no. 20: 5395. https://doi.org/10.3390/en13205395

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