STEAM HYDRATION ACTIVATION OF CELLULOSE TEMPLATE MODIFIED Ca-BASED CO2 SORBENT
The modified Ca-based sorbent particles were prepared by the extrusion-spheronization method.The cyclic CO2 capture capacity was tested using the dual fixed bed reaction system.After 20 cycles,the CO2 uptake of the sorbents with 5％cement and 10％cellulose added was 0.19 g/g.The modified Ca-based absorbents were treated with separate hydration after the calcination under different steam volume fraction and temperature,to regenerate the CO2 capture performance.The CO2 sorption of the modified sorbent was 0.59 g/g after 20 cycles,which was realized by the hydration with 30％steam of 300 ℃.The 1st,10th,20th carbonation of the sorbent treated with steam hydration was examined by using the thermal gravimetric analyzer,in order to investigate the effect of hydration treatment on the reaction kinetics of the carbonation stage of the sorbent.It was found that steam hydration reactivation improves the reaction rate of the product layer diffusion control stage of carbonation.Furthermore,the test results of the micro-morphology,pore structure,and mechanical properties of the sorbent particles before and after hydration reactivation showed significant cracks on the surface of the adsorbents after activation,and the crushing force and anti-abrasion properties also decreased remarkably.
CO2 captureCa-based sorbentscellulose templatesteam hydrationmechanical property
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