Al2O3 and CeO2-promoted MgO sorbents for CO2 capture at moderate temperatures

作     者：Huimei Yu Xiaoxing Wang Zhu Shu Mamoru Fujii Chunshan Song 

作者机构：EMS Energy Institute PSU-DUT Joint Center for Energy Research and Department of Energy & Mineral Engineering Pennsylvania State University University Park 16802 USA Shanghai Institute of Ceramics Chinese Academy of Sciences Shanghai 200050 China East China University of Science and Technology Shanghai 200237 China 

出 版 物：《Frontiers of Chemical Science and Engineering》 (化学科学与工程前沿（英文版）)

年 卷 期：2018年第12卷第1期

页      面：83-93页

核心收录：

学科分类：080503[工学-材料加工工程] 0808[工学-电气工程] 0817[工学-化学工程与技术] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 

基　　金：Acknowledgements The authors gratefully acknowledge the financial support from Pennsylvania State University through the Penn State Institutes of Energy and the Environment  and from the National Natural Science Foundation of China (Grant No. 21005083) and the Innovative Fund of Shanghai Institute of Ceramics  Chinese Academy of Sciences (Grant No. Y37ZC4140G). Dr. Huimei Yu would like to thank the Chinese Academy of Sciences for the visiting scholarship and Dr. Song for the visiting scholar invitation to the EMS Energy Institute at Penn State 

主　　题：CO2 capture MgO sorbents Al2O3 CeO2,flue gas 

摘      要：A series of Al2O3 and CeO2 modified MgO sorbents was prepared and studied for CO2 sorption at moderate temperatures. The CO2 sorption capacity of MgO was enhanced with the addition of either Al2O3 or CeO2. Over Al2O3-MgO sorbents, the best capacity of 24.6 mg- CO2/g-sorbent was attained at 100 ℃, which was 61% higher than that of MgO （15.3 mg-CO2/g-sorbent）. The highest capacity of 35.3 mg-CO2/g-sorbent was obtained over the CeO2-MgO sorbents at the optimal temperature of 200 ℃. Combining with the characterization results, we conclude that the promotion effect on CO2 sorption with the addition of Al2O3 and CeO2 can be attributed to the increased surface area with reduced MgO crystallite size. Moreover, the addition of CeO2 increased the basicity of MgO phase, resulting in more increase in the CO2 capacity than Al2O3 promoter. Both the Al2O3-MgO and CeO2- MgO sorbents exhibited better cyclic stability than MgO over the course of fifteen CO2 sorption-desorption cycles. Compared to Al2O3, CeO2 is more effective for promoting the CO2 capacity of MgO. To enhance the CO2 capacity of MgO sorbent, increasing the basicity is more effective than the increase in the surface area.