New mesoscopic hollow sphere sorbents composed of CaO/Ca12Al14O33 with tunable cavity size are successfully synthesized using sulfonated polystyrene (PS) as hard template. The monodispersed hollow nanostructure provides the void space that can buffer against the large volume change during the carbonation/calcination cycles. The as-prepared high temperature CO2 sorbents have large specific surface areas, fast adsorption kinetics, significantly improved CO2 adsorption capacity and cyclic reaction stability. This method opens up new opportunities in the development of high performance next-generation high temperature CO2 sorbents.
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Liu et al. (2013) studied this question.
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