Synthesis, characterization, and high temperature CO2 capture of new CaO based hollow sphere sorbents

Abstract

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.