Carbon Dioxide Captured from Flue Gas by Modified Ca-based Sorbents in Fixed-bed Reactor at High Temperature

doi:10.1016/S1004-9541(13)60459-0

摘要/Abstract

摘要： Four kinds of Ca-based sorbents were prepared by calcination and hydration reactions using different precursors: calcium hydroxide, calcium carbonate, calcium acetate monohydrate and calcium oxide. The CO₂ absorption capacity of those sorbents was investigated in a fixed-bed reactor in the temperature range of 350-650 ℃. It was found that all of those sorbents showed higher capacity for CO₂ absorption when the operating temperature higher than 450 ℃. The CaAc₂-CaO sorbent showed the highest CO₂ absorption capacity of 299 mg·g^-1. The morphology of those sorbents was examined by scanning electron microscope (SEM), and the changes of composition before and after carbonation were also determined by X-ray diffraction (XRD). Results indicated that those sorbents have the similar chemical compositions and crystalline phases before carbonation reaction [mainly Ca(OH)₂], and CaCO₃ is the main component after carbonation reaction. The SEM morphology shows clearly that the sorbent pores were filled with reaction products after carbonation reaction, and became much denser than before. The N₂ adsorption-desorption isotherms indicated that the CaAc₂-CaO and CaCO₃-CaO sorbents have higher specific surface area, larger pore volume and appropriate pore size distribution than that of CaO-CaO and Ca(OH)₂-CaO.

关键词: CO₂ capture, carbonation reaction, fixed-bed reactor, multicycle reaction

Abstract: Four kinds of Ca-based sorbents were prepared by calcination and hydration reactions using different precursors: calcium hydroxide, calcium carbonate, calcium acetate monohydrate and calcium oxide. The CO₂ absorption capacity of those sorbents was investigated in a fixed-bed reactor in the temperature range of 350-650 ℃. It was found that all of those sorbents showed higher capacity for CO₂ absorption when the operating temperature higher than 450 ℃. The CaAc₂-CaO sorbent showed the highest CO₂ absorption capacity of 299 mg·g^-1. The morphology of those sorbents was examined by scanning electron microscope (SEM), and the changes of composition before and after carbonation were also determined by X-ray diffraction (XRD). Results indicated that those sorbents have the similar chemical compositions and crystalline phases before carbonation reaction [mainly Ca(OH)₂], and CaCO₃ is the main component after carbonation reaction. The SEM morphology shows clearly that the sorbent pores were filled with reaction products after carbonation reaction, and became much denser than before. The N₂ adsorption-desorption isotherms indicated that the CaAc₂-CaO and CaCO₃-CaO sorbents have higher specific surface area, larger pore volume and appropriate pore size distribution than that of CaO-CaO and Ca(OH)₂-CaO.

Key words: CO₂ capture, carbonation reaction, fixed-bed reactor, multicycle reaction

杨磊, 于宏兵, 王胜强, 王浩闻, 周奇彬. Carbon Dioxide Captured from Flue Gas by Modified Ca-based Sorbents in Fixed-bed Reactor at High Temperature[J]. Chinese Journal of Chemical Engineering, DOI: 10.1016/S1004-9541(13)60459-0.

YANG Lei, YU Hongbing, WANG Shengqiang, WANG Haowen, ZHOU Qibin. Carbon Dioxide Captured from Flue Gas by Modified Ca-based Sorbents in Fixed-bed Reactor at High Temperature[J]. Chin.J.Chem.Eng., DOI: 10.1016/S1004-9541(13)60459-0.

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