Tailor-Made Core鈥揝hell CaO/TiO2鈥揂l2O3 Architecture as a High-Capacity and Long-Life CO2 Sorbent

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• 作者：Weiwei Peng ; Zuwei Xu ; Cong Luo ; Haibo Zhao
• 刊名：Environmental Science & Technology
• 出版年：2015
• 出版时间：July 7, 2015
• 年：2015
• 卷：49
• 期：13
• 页码：8237-8245
• 全文大小：587K
• ISSN：1520-5851

文摘

CaO-based sorbents are widely used for CO₂ capture, steam methane reforming, and gasification enhancement, but the sorbents suffer from rapid deactivation during successive carbonation/calcination cycles. This research proposes a novel self-assembly template synthesis (SATS) method to prepare a hierarchical structure CaO-based sorbent, Ca-rich, Al₂O₃-supported, and TiO₂-stabilized in a core鈥搒hell microarchitecture (CaO/TiO₂鈥揂l₂O₃). The cyclic CO₂ capture performance of CaO/TiO₂鈥揂l₂O₃ is compared with those of pure CaO and CaO/Al₂O₃. CaO/TiO₂鈥揂l₂O₃ sorbent achieved superior and durable CO₂ capture capacity of 0.52 g CO₂/g sorbent after 20 cycles under the mild calcination condition and retained a high-capacity and long-life performance of 0.44 g CO₂/g sorbent after 104 cycles under the severe calcination condition, much higher than those of CaO and CaO/Al₂O₃. The microstructure characterization of CaO/TiO₂鈥揂l₂O₃ confirmed that the core鈥搒hell structure of composite support effectively inhibited the reaction between active component (CaO particles) and main support (Al₂O₃ particles) by TiO₂ addition, which contributed to its properties of high reactivity, thermal stability, mechanical strength, and resistance to agglomeration and sintering.