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Composite Material for Thermochemical Energy Storage Using CaO/Ca(OH)2

AuthorsÁlvarez Criado, Yolanda ; Alonso Carreño, Mónica ; Abanades García, Juan Carlos
Issue Date6-Sep-2015
PublisherAmerican Chemical Society
CitationIndustrial and Engineering Chemistry Research 54(38): 9314-9327 (2015)
AbstractThis work describes a material that has improved mechanical and reactivity properties for use in thermochemical energy storage systems based on CaO/Ca(OH)2 reversible reactions. The composite material uses sodium silicate as a binder of active CaO particles. The observed mechanical stability of the material is due to the formation of hard Ca silicates resulting from the reaction of the binder with the exterior of the CaO particles. A screening of the main synthesis variables affecting the composite was carried out, including Ca precursors of different particle size, a range of molar Ca/Si ratios, as well as the curing and calcination conditions. The most suitable material (containing CaCO3 with a particle size of 36–63 μm as calcium precursor and a molar Ca/Si ratio of 4.8–6.2, calcined in air at 850 °C) was tested over many hydration/dehydration cycles (up to 500) in a thermogravimetric apparatus. The material sustained high molar hydration conversions (between 0.6 and 0.7) and crushing strength values of >2 N after 200 cycles, when dehydrated in pure steam.
Publisher version (URL)http://dx.doi.org/10.1021/acs.iecr.5b02688
Appears in Collections:(INCAR) Artículos
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