542 / 2019-01-15 11:04:00

Mode investigation of CO2 sorption enhancement for titanium dioxide-bound CaO-based pellets

CO2 sorption; enhanced capability; TiO2-bound pellet; extrusion-spheronization

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The rapid loss-in-capacity and severe attrition are easily encountered for CaO-based pellets during multiple CO2 capture cycles. Hence, it is necessary to prepare highly efficient CO2 capture sorbent with high capability for CO2 uptake and attrition resisting. In this work, TiO2 was selected as the inert binder to prepare TiO2-bound pellets (0.9-1.25 mm) via an extrusion-spheronization. The effect of doping ratio and modifying mode on the cyclic CO2 capture performance of TiO2-bound pellets were investigated. Three modifying modes of dry-mixing, wet-mixing and hydration-mixing were adopted to prepare TiO2-bound pellets, respectively. The results reveal that TiO2-bound pellets prepared via hydration-mixing possess the superior CO2 capture performance and anti-attrition ability compared to other pellets. It is mainly attributed to the porous and stable structure of the TiO2-bound pellets prepared via hydration-mixing results from the combination effect of hydration of CaO and uniformly distributed TiO2 particles.