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

作　　者：Liyuan Shan Hui Li Binglu Meng Youhai Yu Yonggang Min 

机构地区：[1]College of Material and Mineral Resource,Xi'an University of Architecture and Technology,Xi'an 710055,China [2]Shaanxi Techno-Institute of Recycling Economy,Xi'an 710055,China [3]Xi'an Institute of Optics and Precision Mechanics of Chinese Academy of Science,Xi'an 710119,China

出　　处：《Chinese Journal of Chemical Engineering》2016年第9期1283-1289,共7页中国化学工程学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(51274159);Special Funds for The Major Science and Technology Innovation of Shaanxi Province(2012zkc06-2)

摘　　要：Limestone can be used for CO_2 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 CO_2 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 CO_2 capture performance enhanced under the same conditions.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.

关 键 词：CO2 capture Palygorskite modification LIMESTONE Carbonation rate Anti-sintering 

分 类 号：X701[环境科学与工程—环境工程] TQ028.17[化学工程]