Investigating the activity of Ca₂Fe₂O₅ additives on the thermochemical energy storage performance of limestone waste

Abstract

Activation energy for CaCO3 calcination reaction was reduced using Ca2Fe2O5 additives which improved the thermochemical cycling capacity of limestone waste.

Reversible sorption of carbon dioxide in Ca–Mg–Fe systems for thermochemical energy storage applications

“…Anwar et al reported that a Ca 2 Fe 2 O 5 additive lowered the decomposition activation energy of limestone waste from 182.3 to 162.3 kJ mol −1 . 36 CaCO 3 –Al 2 O 3 (20 wt%) was also reported with an activation energy of 169 ± 17 kJ mol −1 . 11 Here, the estimated activation energy is closer to the value of 206 kJ mol −1 calculated by Olszak-Humienik et al for the decomposition of natural dolomites and the 234 kJ mol −1 by Ptáček et al for thermal decomposition of ferroan dolomites in inert atmosphere.…”

“…Anwar et al measured a similar conversion for their sample with a Ca : Fe ratio of 1 : 1 after 40 cycles. 36 Information on the reaction kinetics are available in Fig. S1 (ESI†).…”

“…35 Recently, Anwar et al obtained promising results using Ca 2 Fe 2 O 5 as an additive to enhance the conversion and cyclic stability of limestone for TCES. 36…”

Exploring the Role of Additives in Enhancing the Performance of Limestone-Based Thermochemical Energy Storage: A Review

“…Limestone is decomposed into CaO and CO 2 by absorbing heat (calcination), while during the reverse reaction the heat is released (carbonation). This approach offers numerous advantages, including low material cost (approximately $10 per tonne for CaCO 3 /CaO), widespread availability, nontoxicity, exceptionally high energy density (reaching up to 4 GJ m −3 ) and reaction enthalpy (∆H 860 • C = 165.9 kJ) [95], operation at very high temperatures (exceeding 800 • C), catalyst-free operation, byproductfree reactions, and extensive experimental validation from Carbon Capture and Storage (CCS) applications [58].…”