Abstract
The pelletization of CaO for calcium looping process(CLP) are highly desirable for post-combustion capture of CO2. The influence of particle size of the calcium precursor and binder on sorbent CO2 capture performance were investigated. Different calcium precursors: limestone and nano CaCO3, and different binders: calcium aluminate cement, micro Al2O3 and nano Al2O3 were used for pellet preparation. After calcination, CaO mixed with calcium aluminate cements served to produce calcium aluminate (Ca12Al14O33) pinning sites, acting as a thermally stable and mechanically hard support for CaO bulk. XRD and SEM showed that nano calcium precursor led to higher mayenite production and a homogeneous mixture of mayenite and CaO, having a perfect dispersion effect to avoid sintering. Durability studies showed that composite pellet with nano CaCO3/cement captured 0.20 gCO2/g calcined sorbent after 15 cycles, while the capacity of limestone/cement was only 0.14g/g. The influence of binder particle size was further investigated and nano CaCO3/nano Al2O3 showed better CO2 capture performance compared with calcium aluminate cement and micro Al2O3.
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