Improvement of CO₂ capture performance of calcium-based absorbent modified with palygorskite

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• 作者：Liyuan Shan¹ ; Hui Li¹ ; ² ; Binglu Meng³ ; Youhai Yu³ ; ^{youhai.yu@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Yonggang Min¹ ; ² ; ^{yong686@126.com" class="auth_mail" title="E-mail the corresponding author}
• 关键词：CO2 capture ; Palygorskite modification ; Limestone ; Carbonation rate ; Anti-sintering
• 刊名：Chinese Journal of Chemical Engineering
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：24
• 期：9
• 页码：1283-1289
• 全文大小：1222 K

文摘

Limestone can be used for CO₂ capture and sequestration (CCS) in flue gas effectively. However, its CCS capability will dramatically decline after several cycles due to the surface “sintering”. In this work, the limestone was modified with palygorskite to reduce sintering phenomenon between the absorbent particles during the CCS process and the carbonation rate of the limestone can be enhanced effectively. Palygorskite is a natural mineral with nano-fibrous structure which can reduce the mutual contact of limestone particles during the CCS process. The results were detected by TGA, SEM, MIP, FTIR and particle size analyzer respectively. The best CO₂ capture performance of modified absorbent was 13.11% improvement with only 5 wt% palygorskite added during the CCS process after 15 cycles compared with natural absorbent. It was found that excellent microscopic structures of absorbent modified with palygorskite was created, and the surface sintering was postponed leading to CO₂ capture performance enhanced under the same conditions.