Citrate Sol–Gel Method for the Preparation of Sodium Zirconate for High-Temperature CO2 Sorption

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• 作者：Hyun Geun Jo ; Hyung Jin Yoon ; Chan Hyun Lee ; Ki Bong Lee
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：April 6, 2016
• 年：2016
• 卷：55
• 期：13
• 页码：3833-3839
• 全文大小：425K
• ISSN：1520-5045

文摘

The use of sorbents capable of capturing high-temperature CO₂ increases the overall efficiency of CO₂ removal processes, without the need for cooling the flue gases. In this study, Na₂ZrO₃ for high-temperature CO₂ sorption was newly prepared using a citrate sol–gel method. The characteristics and CO₂ sorption behavior of the prepared Na₂ZrO₃ were examined by field-emission scanning electron microscopy, N₂ adsorption analysis, X-ray diffraction, and thermogravimetric analysis, and compared with those of Na₂ZrO₃ synthesized using a conventional solid-state method. Na₂ZrO₃ could be synthesized at lower temperature by using the citrate sol–gel method compared to the case of solid-state method. Na₂ZrO₃ prepared using the citrate sol–gel method showed excellent CO₂ sorption performance: high sorption capacity (17.5–21.0 wt % at 823 K and 1 bar), fast sorption kinetics, and good cycling stability. Kinetic analysis was also conducted by fitting the CO₂ sorption behavior to the double exponential model.