Cyclic CO₂ capture behavior of KMnO₄-doped CaO-based sorbent

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• 作者：Yingjie Li ; Changsui Zhao ; Huichao Chen ; Lunbo Duan ; Xiaoping Chen
• 关键词：CaO-based sorbent ; KMnO₄ ; Calcination/carbonation ; CO₂ capture
• 刊名：Fuel
• 出版年：2010
• 出版时间：March 2010
• 年：2010
• 卷：89
• 期：3
• 页码：642-649
• 全文大小：972 K

文摘

This study examines the CO₂ capture behavior of KMnO₄-doped CaO-based sorbent during the multiple calcination/carbonation cycles. The cyclic carbonation behavior of CaCO₃ doped with KMnO₄ and the untreated CaCO₃ was investigated. The addition of KMnO₄ improves the cyclic carbonation rate of the sorbent above carbonation time of 257 s at each carbonation cycle. When the mass ratio of KMnO₄/CaCO₃ is about 0.5–0.8 wt. % , the sorbent can achieve an optimum carbonation conversion during the long-term cycles. The carbonation temperature of 660–710 °C is beneficial to cyclic carbonation of KMnO₄-doped CaCO₃. The addition of KMnO₄ improves the long-term performance of CaCO₃, resulting in directly measured conversion as high as 0.35 after 100 cycles, while the untreated CaCO₃ retains conversion less than 0.16 at the same reaction conditions. The addition of KMnO₄ decreases the surface area and pore volume of CaCO₃ after 1 cycle, but it maintains the surface area and pores between 26 nm and 175 nm of the sorbent during the multiple cycles. Calculation reveals that the addition of KMnO₄ improves the CO₂ capture efficiency significantly using a CaCO₃ calcination/carbonation cycle and decreases the amount of the fresh sorbent.