Adsorption of CO2 on Mixed Oxides Derived from Ca–Al–ClO4-Layered Double Hydroxide

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• 作者：Shengping Wang ; Chun Li ; Suli Yan ; Yujun Zhao ; Xinbin Ma
• 刊名：Energy & Fuels
• 出版年：2016
• 出版时间：February 18, 2016
• 年：2016
• 卷：30
• 期：2
• 页码：1217-1222
• 全文大小：409K
• ISSN：1520-5029

文摘

In this paper, we studied the CO₂ adsorption performances of well-mixed oxides with Ca/Al ratios of 2:1, 2.5:1, 3:1, 3.5:1, and 4:1, which were prepared through the thermal decomposition of co-precipitated hydrotalcite-like Ca–Al–ClO₄ precursors. The mixed oxides with a Ca/Al ratio of 3 exhibited the best performance at the adsorption temperature of 600 °C, and approximately 87% of the initial CO₂ capture capacity was retained after 50 cycles of multiple carbonation/calcination tests. The favorable cyclical performance of the adsorbent is attributed to the homogeneous distribution of Al₂O₃ among CaO particles, which effectively prevented the aggregation and sintering of CaO crystallite. Furthermore, a smaller particle size (about 30 nm) of CaO allowed for as much carbonation as possible to take place at the rapid reaction-controlled regime rather than at the diffusion-controlled regime, resulting in the favorable long-term adsorption performance.