(737e) Thermal Energy Storage Using Sorption-Assisted Boudouard Processes

This study presents current results on the development of a long term storage of solar heat via chemical conversion of simple carbon-based chemicals using Sorption-Assisted Boudouard Processes [1-3].

2CO + MO ↔ MCO₃ + C ΔH = -350 kJ/mol

where M represents a Group 2A element.

This approach enhances and simplifies our prior design [4] by enabling operation at higher temperatures, and bypassing the need to store CO₂ in addition to CO. Because energy storage occurs at ambient temperature, this approach allows for very long-term storage of the heat without degradation, enabling heat storage at time scales from intra-day to seasonal displacement (i.e., indefinitely) as desired. The system is being examined to enable continuous solar thermal energy storage, as well as for the development of solar thermal industrial process heat.

Current results reflecting system performance, modulating charge and discharge temperatures, and exergetic efficiency will be presented.

References:

[1] Boudouard, O. Influence De La Vapeur D’eau Sur La Réduction De L’anhydride Carbonique Par Le Charbon C. R. Hebd. Acad. Sci. 1905, 141, 252– 253.

[2] Hunt, J.; Ferrari, A.; Lita, A.; Crosswhite, M.; Ashley, B.; Stiegman, A.E. Microwave-Specific Enhancement of the Carbon–Carbon Dioxide (Boudouard) Reaction J. Phys. Chem. C 2013, 117, 26871–26880.

[3] Rout, K.R.; Gilband, M. V.; Chen, D. Highly Selective CO Removal by Sorption Enhanced Boudouard Reaction for Hydrogen Production Catal. Sci. Technol. 2019, 9, 4100–4107.

[4] Miao, Y.; Yokochi, A; AuYeung, N.; von Jouanne, A Thermal Energy Storage Using the Boudouard Reaction 2020 Annual Meeting of the American Institute of Chemical Engineers, Virtual, Nov 16-20 2020, Paper 559f.