Studies on CO2 Adsorption and Desorption Properties from Various Types of Iron Oxides (FeO, Fe2O3, and Fe3O4)

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• 作者：Azizul Hakim ; Tengku S. Marliza ; Najiha M. Abu Tahari ; Roslam W. N. Wan Isahak ; Rahimi M. Yusop ; Wahab M. Mohamed Hisham ; Ambar M. Yarmo
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 27, 2016
• 年：2016
• 卷：55
• 期：29
• 页码：7888-7897
• 全文大小：564K
• 年卷期：0
• ISSN：1520-5045

文摘

Various type iron oxides of FeO, Fe₂O₃, and Fe₃O₄ were used for carbon dioxide (CO₂) capture at room temperature and pressure by studying its adsorption–desorption properties. Several interactions of carbonate species were detected on its surface. The morphology of carbonate formation shows different structures on FeO (grooves-like), Fe₂O₃ (fine sharp particles), and Fe₃O₄ (aggregated nanoparticles). CO₂ chemisorption discovered a potential adsorbent of Fe₂O₃ with an adsorption capacity of 3.95 mg_CO2/g_adsorbent. The adsorption capacity increased up to 62.8% by using concentrated 99.9% CO₂ for adsorption. At higher concentration of CO₂ exposure, it partially turns to red color which indicated the less stable Fe₃O₄ was easily oxidized to Fe₂O₃ after CO₂ regeneration with temperatures up to 500 °C. Hence, Fe₂O₃ possessed the highest basicity strength (1.26 cm³/g), and the adsorption capacity after four cycles was not significantly reduced by 8.6% indicating an effective chemical or physical adsorption in CO₂ capture.