Abstract
AbstractTo promote and maintain the reactivity of calcium‐based sorbents for CO2capture is essential for calcium looping technology. Biomass together with cement was doped with calcium‐based sorbents pellets to promote the reactivity and enhance the sintering resistance for CO2capture. The influence of parameters, such as biomass types, addition, pretreatments, precursors, and cement amounts on CO2capture performance of sorbents are determined and an optimized process is developed for sorbents pellets making. Biomass such as coconut shell doped with calcium‐based sorbents present promising enhancement in CO2capture capacity. Sorbents doped with pretreated biomass exhibit excellent CO2capture performance with a carbonation conversion of 0.6 and 0.73 after 10 cycles, respectively. The microstructures of the sorbents characterized by N2physisorption/desorption and the phase structure determined byin situX‐ray diffraction (XRD) are investigated as a supplement for mechanism study. The release of volatiles and pyrolysis of biomass char in sorbents are the main causes for microstructure improvement for sorbents. The formations of CaAl2O4, CaAl4O7and Ca12Al14O33in sorbents during the carbonation/calcination cycles account for the enhancement of the sorbents’ sintering resistance. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd.
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