Thermal Stability of Calcium Oxalates from CO2 Sequestration for Storage Purposes: An In-Situ HT-XRPD and TGA Combined Study
Articolo
Data di Pubblicazione:
2022
Abstract:
Calcium oxalates are naturally occurring biominerals and can be found as a byproduct of
some industrial processes. Recently, a new and green method for carbon capture and sequestration
in stable calcium oxalate from oxalic acid produced by carbon dioxide reduction was proposed.
The reaction resulted in high-quality weddellite crystals. Assessing the stability of these weddellite
crystals is crucial to forecast their reuse as solid-state reservoir of pure CO2 and CaO in a circular
economy perspective or, eventually, their disposal. The thermal decomposition of weddellite obtained
from the new method of carbon capture and storage was studied by coupling in-situ high-temperature
X-ray powder diffraction and thermogravimetric analysis, in order to evaluate the dehydration,
decarbonation, and the possible production of unwanted volatile species during heating. At low
temperature (119–255 °C), structural water release was superimposed to an early CO2 feeble evolution,
resulting in a water-carbon dioxide mixture that should be separated for reuse. Furthermore, the
storage temperature limit must be considered bearing in mind this CO2 release low-temperature
event. In the range 390–550 °C, a two-component mixture of carbon monoxide and dioxide is evolved,
requiring oxidation of the former or gas separation to reuse pure gases. Finally, the last decarbonation
reaction produced pure CO2 starting from 550 °C.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
weddellite; dehydration; decarbonation; thermal decomposition; HT-XRPD; TGA-FTIR
Elenco autori:
Nadia Curetti, Linda Pastero, Davide Bernasconi, Andrea Cotellucci, Ingrid Corazzari, Maurizio Archetti, Alessandro Pavese
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