289427 A Novel KMgAl Sorbent for CO2 Capture in a Fluidized Bed

Tuesday, October 30, 2012
Hall B (Convention Center )
Fukui Xiao and Wei Wei, State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, China

Carbon capture and storage (CCS) is recognized as a promising option for CO2 emission reduction. The post-combustion process is more suitable for CO2 capture for the traditional pulverized coal power plants. However, the considerable cost of CO2 capture approximately accounts 70% of the total cost of CCS. Thus, the key technology of CO2 capture is to reduce the parasitic energy cost of the system. CO2 chemical adsorption using dry regenerable solid sorbents had attracted much attention due to the low cost of raw materials and non-corrosion property. In previous study, we had found that MgO/Al2O3sorbent with 10wt% MgO loading showed a better performance for CO2 capturing at low temperature in the fixed-bed. Nevertheless, the absorption amount of CO2 was not high. Furthermore, in the absorption process, heat control is important to avoid hot spots generated during the highly exothermic carbonation reaction. Thus, a novel solid sorbent impregnated with K2CO3 over MgO/Al2O3 support was prepared and the performance for CO2 capture was investigated in the fluidized bed. The resultshowed that the KMgAlI3010 sorbent had a high CO2 uptake of 109.6 mg CO2/g sorbent at the flow rate of 12 Nm3/h at 60 oC under simulated flue gas conditions, which was larger than those of most K-based sorbents reported before at low temperatures, and the MgO played an important role in the high CO2 capture capacity of KMgAl sorbents,for the forming of thehydrotalcite-like compounds on the surface and in the pore of Al2O3after water vapor pretreatment.

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