ie9b00944_si_001.pdf (2.35 MB)
Effect of Seawater, Aluminate Cement, and Alumina-Rich Spinel on Pelletized CaO-Based Sorbents for Calcium Looping
journal contribution
posted on 2019-06-26, 11:41 authored by Lorena Morona, María Erans, Dawid P. HanakCalcium
looping (CaL) is considered as an emerging technology to
reduce CO2 emissions in power generation systems and carbon-intensive
industries. The main disadvantage of this technology is reactivity
decay over carbonation/calcination cycles due to sintering. The main
objective of this study was to evaluate the performance of novel sorbents
for CaL. Three types of pelletized CaO-based sorbents for CO2 capture were developed by adding aluminate cement, aluminate cement
with seawater, or alumina-rich spinel to calcined limestone. Different
concentrations of seawater in deionized water solutions were tested:
1, 10, 25, and 50 vol %. All samples were tested in a thermogravimetric
analyzer (TGA) under two different calcination conditions: mild (N2 atmosphere and 850 °C during calcination) and realistic
(CO2 atmosphere and 950 °C during calcination). The
samples were characterized using SEM and EDX. Aluminate cement CaO-based
sorbents exhibited better performance in the TGA tests (25% conversion
after 20 cycles achieved by limestone and 35% with aluminate cement
CaO-based pellets, under mild conditions, and 11% conversion after
20 cycles with limestone compared to 15% utilizing aluminate cement
CaO-based pellets, under realistic conditions). However, doping had
a negative effect on the reactivity of the sorbent. Moreover, alumina
rich spinel CaO-based sorbents showed the worst performance.
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CO 2 atmospherereactivitydeionized water solutionsAluminate cement CaO-based sorbentsseawaterspinel CaO-based sorbentsCaLN 2 atmospherePelletized CaO-Based Sorbentsaluminate cement CaO-based pelletspower generation systemspelletized CaO-based sorbentsCO 2 emissionslimestonecalcinationSEMaluminate cementsampleCalcium Looping Calcium loopingEDXtechnologyconversionTGAperformance20 cycles
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