- Title
- Thermochemical conversion of biomass in the presence of molten alkali-metal carbonates under reducing environments of N2 and CO2
- Creator
- Jalalabadi, Tahereh; Moghtaderi, Behdad; Allen, Jessica
- Relation
- Energies Vol. 13, Issue 20, no. 5395
- Publisher Link
- http://dx.doi.org/10.3390/en13205395
- Publisher
- MDPI AG
- Resource Type
- journal article
- Date
- 2020
- Description
- 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.
- Subject
- slow pyrolysis; Boudouard reaction; carbonate gasification; ternary eutectic; biomass; SDG 7; SDG 13; Sustainable Development Goals
- Identifier
- http://hdl.handle.net/1959.13/1439427
- Identifier
- uon:40921
- Identifier
- ISSN:1996-1073
- Language
- eng
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Goal 13: Climate Change
Goal 7: Ensure access to affordable, reliable, sustainable and modern energy
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