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G. Gravogl, C. Knoll, W. Artner, E. Eitenberger, G. Friedbacher, A. Werner, M. Harasek, P. Weinberger, D. Müller, R. Miletich:
"Moisture-triggered ambient-temperature carbonatization of main group II metal oxides under elevated CO₂ pressure";
ISES Solar World Congress Proceedings, 1 (2017), 799 - 810.

The reversible reaction of metal oxides with CO₂ forming metal carbonates with concomitant release of energy is considered as a promising concept for thermochemical energy storage. One major advantage of thermochemical energy storage materials is the possibility of a lossless mid-term and long-term storage of waste heat. Metal carbonates provide high-energy densities and were so far investigated for their application in high-temperature processes. Inspired by the carbonatization of (main group II) metal oxides in nature during mineralization and CO₂ fixation in the presence of moisture under elevated pressures, the Me (II) oxides (Me = Mg, Ca, Sr, Ba) were investigated with respect to their reactivities with CO₂ at pressures up to 55 bar and ambient temperature. Whereas
for MgO none of the applied conditions yielded any formation of a carbonate phase, the other oxides revealed appropriate reactivities by forming corresponding carbonates under considerably mild reaction conditions.

main group II oxides, main group II carbonates, low-temperature carbonatization, in-situ powder XRay diffraction, thermochemical energy storage

http://dx.doi.org/10.18086/swc.2017.14.01