Steam hydration is reported to be an effective method for reactivating spent sorbents in calcium looping applications; however, uncertainties remain regarding the optimal method of returning the hydrated sorbent to the CO 2 capture loop. Carbonation conversions were found to be higher when Ca(OH) 2 was directly carbonated at high temperatures compared to conversions reached when Ca(OH) 2 was dehydrated prior to carbonation. This observation can lead to improved hydration based reactivation techniques for calcium looping applications. Upon heating in CO 2, calcium hydroxide remained stable at temperatures >450 °C and the extent of carbonation was controlled by temperature only. The carbonation mechanism of Ca(OH) 2 at high temperatures appears to be more complex than the expected simple mechanism comprising the dehydration reaction of Ca(OH) 2 and the subsequent carbonation of the resulting CaO. An alternate mechanism was proposed, involving the formation of liquid like layers of water on the surface of Ca(OH) 2 .
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Materić et al. (2011) studied this question.
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