Modification of magnesium and calcium hydroxides with salts: An efficient way to advanced materials for storage of middle-temperature heat

Thermochemical Energy Storage using LiNO3‐Doped Mg(OH)2: A Dehydration Study

“…Thet hermogravimetric analysis (TGA) shows that the pure Mg(OH) 2 cannot be dehydrated at 240 8Ca nd P(H 2 O) = 2.3 kPa ( Figure 3a). Although under these conditions the dehydration is thermodynamically permitted, [35] the driving force is not sufficient for any conversion to be detected for 600 min. Thea dditiono f0 .5 and 2mass %o fL iNO 3 makes the dehydration possible, however, the final conversion a f for these materials is quite low (0.062 and 0.171, respectively) due to the abovementioned incomplete modificationo f Mg(OH) 2 .T he further salt addition increases the final conversion up to 0.8-0.95 and significantlyr educes the half-conversion time (Figure 3a).…”

“…Its promising properties have encouraged numerous fundamental and applied studies aimed at the adaption of this material for TCES including design of lab‐scale prototypes . However, the real temperatures and pressures at which the dehydration proceeds with rate acceptable for practical applications are far from the theoretical equilibrium . This means that the fast dehydration requires either higher temperature or lower vapor pressure as compared with the equilibrium conditions.…”

“…[26][27][28][29][30][31][32][33][34] However, the real temperatures and pressures at which the dehydration proceedsw ith rate acceptablef or practical applications are far from the theoretical equilibrium. [35] This means that the fast dehydrationr equirese ither higher temperature or lower vapor pressure as compared with the equilibrium conditions. Overheating or/and underpressure create ad riving force necessary for essential reconstruction of the crystalline lattice of the hydroxide to that of the oxide.S uch ad riving force may be quite substantial for many solid-gas transformations (e.g., for forward and back reactions (1)), and the overheat can exceed 100 8C.…”

Composite material for high‐temperature thermochemical energy storage using calcium hydroxide and ceramic foam

“…Sakellariou et al studied the improvement in the mechanical durability of pelletized materials during repetitive reactions. Shkatulov and Aristov focused on the change in dehydration temperature, and developed composite materials with lower dehydration temperature . Yan and Zhao focused on lithium‐doped calcium hydroxide and reported the kinetics of dehydration of the composite .…”

The Role of the Solvent in Determining the Surface Texture of Magnesium Hydroxide

“…Solid magnesium oxide and hydroxide is used in various processes and finds many applications in a variety of fields such as water treatment [1][2][3], heat storage [4,5] CO 2 storage [6,7] and sound absorption [8] among many others. As a result its surface chemical and textural properties have been extensively studied by several authors.…”