Mayenite-supported CaO for thermochemical storage applications: Ageing time effect over conversion

Calcium Looping for Thermochemical Storage: Assessment of Intrinsic Reaction Rate and Estimate of Kinetic/Transport Parameters for Synthetic CaO/Mayenite Particles from TGA Data

“…In the last two decades, many researchers worldwide have focused on the issue of material deactivation in CaO-based materials. The most commonly used approaches include (i) incorporating CaO particles into various inert supports; − (ii) hydration treatment; − (iii) using sintering-resistant calcium precursors; , and (iv) modifying natural calcium minerals by ball milling or acidification. , While most of these approaches have demonstrated some success in enhancing the performance of CaO-based materials for TES, incorporating CaO particles into inert supports is the most extensively studied and effective approach to solving the loss-in-reactivity issue. Basically, adding inert materials that are resistant to sintering can improve the stability of the material during usage cycles by reducing the loss of active sites.…”

“…Although this material has been extensively researched for CO 2 capture applications, 44 there are still several aspects that need to be investigated to determine its suitability for heat storage applications. Previous studies on the CaO/mayenite system have mainly focused on factors affecting reactivity, such as preparation method, calcium and aluminum precursors, CaO/ mayenite ratio, residence time, particle size, carbonatation temperature, calcination temperature, and stability under ambient air 32 conditions.…”

“…The powder obtained from the synthesis was then tested in a thermogravimetric analyzer (TGA) under carbonatation/calcination looping, and the results confirmed that the addition of mayenite effectively stabilizes the material, ensuring high and sustained conversion over time. 32,33 The kinetic characterization of the material for the carbonation and calcination phases was then carried out. The powder was assumed to be made of distinct CaO/CaCO 3 and mayenite grains, and the kinetic behavior of the single CaO/CaCO 3 grain was described using a generalized shrinking core model.…”

Long-stable solar energy capture and storage via negative thermal expansion regulated calcium-based particles

“…4 At present, the inert carriers with good effect mainly include MgO, MgAl 2 O 4 , ZnO, Ca 12 Al 14 O 33 , SiO 2 , Ca 2 MnO 4 , CaZrO 3 , CuO, CoO, Y 2 O 3 , and CaTiO 3 . [12][13][14][15][16][17][18] To improve the recycling efficiency of calcium-based materials, Kasper et al added ZrO 2 (40%), and the CO 2 capacity was 35.5% after 50 cycles, but a lot of energy storage density was lost. 19 Teng et al improved the spectral absorption by doping with multiple inert carriers (Fe-Mn), and the energy storage density was 1057 kJ kg À1 after 15 cycles.…”