Publications by authors named "Heehwan Kim"
Three different types of nitrile-functionalized amines, including 3-(N,N-diethylamino)propionitrile (DEAPN), 3-(N,N-dibutylamino)propionitrile (DBAPN), and N-methyl-N,N-dipropionitrile amine (MADPN) were synthesized, and their SO2 absorption performances were evaluated and compared with those of hydroxy-functionalized amines such as N,N-diethyl-N-ethanol amine (DEEA), N,N-dibutyl-N-ethanol amine (DBEA), and N-methyl-N,N-diethanol amine (MDEA). Absorption-desorption cycle experiments clearly demonstrate that the nitrile-functionalized amines are more efficient than the hydroxy-functionalized amines in terms of absorption rate and regenerability. Computational calculations with DBEA and DBAPN revealed that DBEA bearing a hydroxyethyl group chemically interacts with SO2 through oxygen atom, forming an ionic compound with a covalently bound OSO2(-) group.
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- The reaction between carbon dioxide (CO2) and the amine TBAE is challenging to monitor with traditional one-dimensional spectroscopy due to overlapping signals.
- Researchers utilized two-dimensional infrared correlation spectroscopy (2D IR COS) and principal component analysis (PCA) to analyze these reaction dynamics and discovered that carbonate formation, rather than carbamate, leads to a high CO2 absorption capacity.
- The study illustrates how PCA and 2D IR COS effectively reveal the mechanisms of this reaction and highlight important chemical bands involved, paving the way for better CO2 absorbent design.