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The zeolite composite shows a similar linear decrease, but up to the 35th cycle, no sudden additional drop in the reactivity was observed. Water adsorption on the zeolite during hydration accounts for a higher heat output during the first 2 cycles, but the dehydration temperature used (130°C) was not sufficient to desorb the additionally adsorbed water. Zeolite A, therefore, shows a certain effect as a structure supporting agent, but the actual results are not indicating a practicable use as an additive for MgCl2 * 6 H2O, as dehydration temperatures for MgCl2 * 6 H2O should not exceed 120°C to avoid thermal decomposition. At these temperatures, the used zeolite A acts as a more or less inert material, where thermal storage capacity is concerned. The structure stabilizing effect possibly can be enhanced using improved methods to prepare the composite, for example wet impregnating and evaporation, as well as possibly better suited zeolites then zeolite A. Also, further work must be done in testing composites using different additives. In a first screening, we found a recovery of around 90% of the energy stored in the transition of MgCl2*6 H2O -> MgCl2*2 H2O + 4 H2O during rehydration using a MgCl2 * 6 H2O : Graphite (1:1) composite (figure 8) and a per-cycle decrease of 1-3 % in reactivity or heat storage capacity, respectively. The plot shows, that the per-cycle reduction in reactivity is decreasing with an increasing number of cycles. It is still necessary, though, to investigate the cycling stability of the graphite and other composites using a number of cycles at least similar to those used for investigation of pure MgCl2 * 6 H2O and the zeolite composite, as shown in figure 7. Furthermore, switching off the moist nitrogen earlier or later can be used to investigate methods to avoid overhydration by controlled hydration of the material in real applications. Figure 8: Heat quantities during dehydration and hydration, cycle efficiency and cycling stability using the transition of MgCl2 * 6 H2O -> MgCl2 * 2 H2O + 4 H2O of a MgCl2 * 6 H2O : Graphite (1:1) composite.PDF Image | THERMOCHEMICAL STORAGE MATERIALS RESEARCH
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