Deactivation of Ca-Based Sorbents by Coal-Derived Minerals during Multicycle CO2 Sorption under Elevated Pressure and Temperature

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• 作者：Koji Kuramoto ; Sayaka Shibano ; Shinji Fujimoto ; Tatsuya Kimura ; Yoshizo Suzuki ; Hiroyuki Hatano ; Lin Shi-Ying ; Michiaki Harada ; Kayoko Morishita ; and Takayuki Takarada
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2003
• 出版时间：July 23, 2003
• 年：2003
• 卷：42
• 期：15
• 页码：3566 - 3570
• 全文大小：284K
• 年卷期：v.42,no.15(July 23, 2003)
• ISSN：1520-5045

文摘

Deactivation of Ca-based sorbents by coal-derived minerals during multicycle CO₂ sorptionreactions at elevated temperature and pressure was investigated using a laboratory-scalehorizontal-tube reactor. The sorbents tended to undergo a solid-solid reaction with coal-derivedash components such as silicon (Si) and aluminum (Al) during multicycle CO₂ sorption with anintermediate hydration stage. This reaction formed complex inorganics, such as mayenite (Ca₁₂Al₁₄O₃₃), calcium silicate (Ca₂SiO₄), and spurrite (Ca₅(SiO₄)₂CO₃), and substantially decreasedthe sorbents' CO₂ sorption ability. Interaction with the coal-derived minerals was significantduring the multicycle calcination-carbonation reaction only when the sorbents were subjectedto the intermediate hydration treatment. This result suggests that steam enhanced the solid-solid interaction between the minerals and the sorbents at elevated temperature (>873 K) andpressure (6.0 MPa) and that the interaction should be avoided by selecting proper reactionconditions for efficient utilization of the Ca-based sorbents.