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Publication | Comparative study on CO2 capture performance of pre-washed agricultural waste-templated, CaO-based pellets subjected to different regeneration conditions

Associate Professor Jian Sun and Professor Chuanwen Zhao published their work in the journal of Energy & Fuels 

Granulation is an effective method to mitigate the issue of CaO-based sorbent elutriation in the calcium looping process. To further enhance CO2 capture performance of CaO-based pellets, pore-forming templates are usually added. In this work, rice straw, wheat straw and corn stalk, were adopted as the pore-forming templates. The effect of different regeneration conditions (mild, moderately severe and severe calcination conditions) on agricultural waste-templated, CaO-based pellets was comparatively investigated. Severe calcination conditions remarkably cause deactivation of the agricultural waste-templated, CaO-based pellets due to the accelerated sintering. Additionally, the existence of alkaline elements within agricultural wastes results in poor CO2 capture performance for agricultural waste-templated, CaO-based pellets. The pretreatment of water- and acid- washing can remove most of the alkaline elements within raw agricultural wastes. The CaO-based pellets added with 10 wt.% of acid-washed rice straw exhibit the highest cumulative CO2 capture capacity of 2.074 g/g during 15 cycles, which is over 2.3 times that of those pellets added with 10 wt.% of raw rice straw. Therefore, water-washing and acid-washing are potential approaches to mitigate the adverse effect of alkaline elements within agricultural wastes, consequently the improved CO2 capture performance for the agricultural waste-templated, CaO-based pellets.