Influence of Additives Including Amine and Hydroxyl Groups on Aqueous Ammonia Absorbent for CO2 Capture

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• 作者：Jong Kyun You ; HoSeok Park ; Seong Ho Yang ; Won Hi Hong ; Weonho Shin ; Jeung Ku Kang ; Kwang Bok Yi ; Jong-Nam Kim
• 刊名：Journal of Physical Chemistry B
• 出版年：2008
• 出版时间：April 10, 2008
• 年：2008
• 卷：112
• 期：14
• 页码：4323 - 4328
• 全文大小：255K
• 年卷期：v.112,no.14(April 10, 2008)
• ISSN：1520-5207

文摘

Aqueous ammonia absorbent (10 wt %) was modified with four kinds of additives (1 wt %) including amineand hydroxyl groups, i.e., 2-amino-2-methyl-1-propanol (AMP), 2-amino-2-methyl-1,3-propandiol (AMPD),2-amino-2-ethyl-1,3-propandiol (AEPD), and tri(hydroxymethyl) aminomethane (THAM), for CO₂ capture.The loss of ammonia by vaporization was reduced by additives, whereas the removal efficiency of CO₂ wasslightly improved. These results were attributed to the interactions between ammonia and additives or absorbentsand CO₂ via hydrogen bonding, as verified by FT-IR spectra and computational calculation. Molecular structuresas well as binding energies were obtained from the geometries of (ammonia + additives) and (ammonia +additives + CO₂) at the optimized state. These experimental and theoretical findings demonstrate that additivesincluding amine and hydroxyl group are suitable for modifying aqueous ammonia absorbent for CO₂ removal.