Na2CO3/MgO/Al2O3 Solid Sorbents for Low-Temperature CO2 Capture

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• 作者：Wei Dong ; Xiaoping Chen ; Fan Yu ; Ye Wu
• 刊名：Energy & Fuels
• 出版年：2015
• 出版时间：February 19, 2015
• 年：2015
• 卷：29
• 期：2
• 页码：968-973
• 全文大小：430K
• ISSN：1520-5029

文摘

Na₂CO₃/Al₂O₃ is one potential medium that could be used for CO₂ capture technology. In recent years, its carbonation and regeneration behaviors have been well-studied, and it is understood that Na₂CO₃/Al₂O₃ demonstrates a high CO₂ capture capacity. Its main drawback is the unsatisfactory CO₂ adsorption rate. Because the total uptake of CO₂ principally depends upon the adsorption in the first 10 min, the increase of the absorption rate in the first 10 min could be greatly significant and valuable. An addition of MgO to Na₂CO₃/Al₂O₃ is considered for a cyclic Na₂CO₃/NaHCO₃-based CO₂ capture process. Scanning electron microscopy and X-ray diffraction characterization of Na₂CO₃/MgO/Al₂O₃ indicate that, besides Na₂CO₃, MgO also participates in the CO₂ absorption reaction and generates a new compound Mg₆Al₂CO₃(OH)₁₆路4H₂O. Moreover, the uptakes of CO₂ and the adsorption rates are observed to increase obviously, especially in the first 10 min.