Synthesis and Characterization of CaO-based Oxide Sorbents Prepared via Limestone as Precursor for Medium Temperature CO2 Capture Performance

• Main Authors: Lu, Yu-Ling, 盧俞伶
• Other Authors: Chen, San-Yuan
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/ae7fcs

碩士 === 國立交通大學 === 材料科學與工程學系所 === 103 === In this study, we chose limestone as the source of CaO-based CO2 sorbent, which is a promising material for CO2 capture at medium temperature. In the first part of this study, we added different amount of metal ion into acetified limestone to investigate the phase and morphology change by XRD and SEM. The highest CO2 capacity is 63.3wt% at 450°C. In the second part, we developed a promoted sorbent by adding promoter into the calcined powder. The TGA results indicated that the 1st-cycle capacity of promoted sorbent was 58.5wt%. After 20 carbonation-calcination cycles the CO2 capacity can retain 67% of its initial capacity, higher than 36% of the sorbent without modification. The last part of this study was to examine the CO2 sorption capacity of the sorbent in the fixed-bed reactor. Furthermore, we investigated two kinds of regeneration method to reactivate the spent sorbent.