Study of MgO-based dry regenerable sorbent for sorption enhanced water gas shift reaction

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• 作者：Dong-Hyeok Choi ^{cdh@kepco.co.kr} ; Joong Beom Lee ; ^{jblee7@kepri.re.kr} ; Tae Hyoung Eom ; Jeom In Baek ; Seong Jegarl ; Chong Kul Ryu
• 关键词：Integrated gasification combined cycle (IGCC) ; Sorption enhanced water gas shift (SEWGS) ; Pre-combustion ; CO2 capture ; Sorbent ; MgO
• 刊名：Renewable Energy
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：54
• 期：Complete
• 页码：144-149
• 全文大小：926 K

文摘

CO₂ sorption capacities and physical properties of the MgO-based sorbent, and the effect of steam during the sorbent regeneration were studied. Four MgO-based dry regenerable sorbents (P-A?¡«?D) were prepared by spray drying method for the application to pre-combustion CO₂ capture. Physical properties of the sorbents were measured by standard ASTM methods. MgO-based sorbents satisfied with most of the physical requirements for commercial fluidized-bed process. All sorbents had a spherical shape and an average size of 106?¡À?10?¦Ìm. Most of the attrition index (AI) of the sorbents except for P-D was below 12 % , which was superior, compared to commercial fluidized catalytic cracking (FCC) catalysts. CO₂ sorption capacities were evaluated by multi-cycle test in a high pressure bubbling fluidized-bed reactor at 473?K and 20?bar with 37 % CO₂. The sorption capacities of the sorbents showed 3.3-14.5?wt % during 3 cycle. Particularly, P-A showed a high CO₂ sorption capacity of more than 14?wt % . In this study, CO₂ sorption capacity of steam-treated sorbent was higher than non-treated sorbent. This result can be explained by the presence of Mg(OH)₂ formed by hydroxylation by MgO and increasing surface area of steam-treated sorbent.