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Hi Temp Thermochemical Energy Storage via Solid Gas Reactions

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Hi Temp Thermochemical Energy Storage via Solid Gas Reactions ( hi-temp-thermochemical-energy-storage-via-solid-gas-reaction )

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Energies 2020, 13, 5859 8 of 23 sound-assisted fluidization method of the reactive powder bed. Fine natural limestone (<50 μm) was used in a lab-scale fluidized bed reactor and the effect of sound-assisted fluidization on the carbonation conversion of the material was studied for TCES using CSP conditions. The acoustic perturbations Energies 2020, 13, x FOR PEER REVIEW 8 of 24 applied to the fine limestone particles proved to hinder the agglomeration of the particles and enhanced tpheerfcoarrmboanacteisonofptehrefomrmataernicael.sTohfethfelumidaizteartiaoln. Tqhuealflituyidwiazsateionnhaqnucaelditytowgeatshenrhwainthceadbteotgtetrhseorliwd–itghaas bcoentttearcst.oIlnida–dgdasitcion,tathcte. aIcnoaudsdtiictipoenr,ttuhrebatciounsdtieccpreartsuerdbtahtieodnedaecctirveatsieodntrhaeted.eactivation rate. Figure 4. Thermogravimetry (TG) analysis of SrCO /SrO and BaCO /BaO showing cycling stability Figure 4. Thermogravimetry (TG) analysis of SrCO3/SrO and BaCO3/BaO showing cycling stability improvement of carbonates via the addition of MgO as inert additive [33]. (a) SrCO /SrO (a. commercial improvement of carbonates via the addition of MgO as inert additive [33]3. (a) SrCO3/SrO (a. SrCO , b. commercial SrCO with 20 wt% MgO, c. SrCO synthesized with 20 wt% MgO, d. commercial comm3ercial SrCO3, b. comm3 ercial SrCO3 with 20 wt% M3 gO, c. SrCO3 synthesized with 20 wt% MgO, SrCO with 32 wt% MgO), and (b) BaCO /BaO (a. commercial BaCO with 44 wt% MgO, b. synthesized d. com3 mercial SrCO3 with 32 wt% Mg3O), and (b) BaCO3/BaO (a.3 commercial BaCO3 with 44 wt% BaCO with 30 wt% MgO, c. 30 wt% MgO presenting low porosity, d. 30 wt% MgO presenting 3 MgO, b. synthesized BaCO3 with 30 wt% MgO, c. 30 wt% MgO presenting low porosity, d. 30 wt% high porosity). MgO presenting high porosity). The solar absorption efficiency of the reactive material itself was recently questioned. An innovative The solar absorption efficiency of the reactive material itself was recently questioned. An approach using the CaO/CaCO3 system proposed to use dark calcium carbonate particles, instead of innovative approach using the CaO/CaCO3 system proposed to use dark calcium carbonate particles, the naturally white material, by doping the material with Cu, Fe, Co or Cr via a sol-gel method [51,52]. instead of the naturally white material, by doping the material with Cu, Fe, Co or Cr via a sol-gel The energy storage density of the material was significantly increased by the binary doping using method [51,52]. The energy storage density of the material was significantly increased by the binary Cu and Mn, reaching 1952 kJ/kg, while the energy storage density of pure CaO/CaCO3 is around doping using Cu and Mn, reaching 1952 kJ/kg, while the energy storage density of pure CaO/CaCO3 1061 kJ/kg. A variation in the solar absorptance of the material was noted depending on the doping is around 1061 kJ/kg. A variation in the solar absorptance of the material was noted depending on metal. For example, when doped with Cu only, the CaCO3 particles had a higher solar absorptance the doping metal. For example, when doped with Cu only, the CaCO3 particles had a higher solar absorptance in the visible range while a full-spectrum absorption of solar energy was achieved with Cr doping. An impact on the cycling stability of the material was also observed, as it was enhanced via Mn and Al doping, but reduced with the addition of Cr. The solar absorption capacity of CaCO3 was also addressed via the doping of the system with Mn-Fe oxides [53]. Porous CaCO3 was synthesized using calcium gluconate (Ca(C6H11O7)2), and it was doped with Mn-Fe using two

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