The adsorption of carbon dioxide by tertiary alkanolamines

The quantification of gaseous carbon dioxide, CO2 adsorbed by tertiary alka nolamines was performed using a quartz crystal microbalance. Carbon dioxide was injected over piezoelectric quartz crystals coated with different amou nts of N,N,N,N'-tetrakis(2-hydroxyethyl)ethyl (THEED), N,N,N',N'-tetrakis(2 -hydroxypropyl)ethylenediamine (Quadrol), and triethanolamine (TEA), and th e frequency decrease of the crystals was recorded. The nature of the intera ction of the alkanolamines with CO2 was investigated by nuclear magnetic re sonance spectroscopy (NMR), Fourier transform infrared spectroscopy (FTIR), fast atom bombardment mass spectrometry (FABMS), and mass spectrometry/mas s spectrometry (MS/MS).