期刊
CHEMICAL ENGINEERING JOURNAL
卷 334, 期 -, 页码 2343-2355出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2017.11.183
关键词
Calcium Looping; Energy storage; CO2 capture; Concentrated Solar Power; Al-Ca composites
资金
- Spanish Government Agency Ministerio de Economia y Competitividad (MINECO-FEDER) [CTQ2014-52763-C2, CTQ2017-83602-C2]
- VI PPIT-US
- VPPI-US
This work reports the Calcium-Looping (CaL) multicycle performance under energy storage and CO2 capture conditions of different Al-composites prepared by milling mixtures of nanoalumina and natural limestone powders. The micro-and nanostructure of the composites have been analyzed by X-ray diffraction, scanning electron microscopy and high-resolution transmission electron microscopy as affected by the type of CaL conditions employed, either for energy storage in Concentrated Solar Power (CSP) plants or for post-combustion CO2 capture. Two types of calcium aluminates are formed under these diverse CaL conditions. A calcium aluminate with ratio Ca/Al < 1 (Ca4Al6O13) is formed under CaL-CSP conditions, which helps stabilize the CaO microstructure and mitigate pore-plugging. On the other hand, a crystalline phase Ca3Al2O6 is formed (Ca/Al > 1) under CaL-CO2 capture conditions presumably due to the higher calcination temperature, which withdraws from the sorbent a relatively higher amount of active Ca. Moreover, the addition of nano-alumina, and the consequent generation of calcium aluminate, affects in a diverse way the microstructure and morphology of the CaO particles as depending on the CaL application, which critically modifies the performance of the composites.
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