Direct CO₂ capture from ambient air using K₂CO₃/Al₂O₃ composite sorbent

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• 作者：Janna V. Veselovskaya ; Vladimir S. Derevschikov ; Tatyana Yu. Kardash ; Olga A. Stonkus ; Tatiana A. Trubitsina ; Aleksey G. Okunev
• 关键词：Carbon dioxide ; Potassium carbonate ; Alumina ; Composite material ; CO2 capture ; Absorption
• 刊名：International Journal of Greenhouse Gas Control
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：17
• 期：Complete
• 页码：332-340
• 全文大小：2834 K

文摘

A composite sorbent K₂CO₃/¦Ã-Al₂O₃ was synthesized and tested for direct carbon dioxide capture from ambient air. Composition and structure of the composite were characterized by means of atomic absorption spectroscopy, low-temperature nitrogen adsorption, X-ray diffraction and transmission electron microscopy, differential scanning calorimetry and thermogravimetry methods. CO₂ absorption from air and desorption experiments were performed in a continuous-flow system. The effect of temperature on thermal regeneration of the composite was investigated. It was shown that stable CO₂ absorption capacity of 4.0-4.9 wt. % can be obtained in cycles with regeneration temperature of 250-300 ¡ãC. The composite sorbent demonstrated a great stability of its CO₂ absorption characteristics, therefore it should be considered as a promising material for direct carbon dioxide capture from air. The total energy required for air-borne CO₂ capture and its subsequent methanation was assessed.