For CO 2 sorption experiments, the scrubber assembly was loaded with a weighed quantity of TMAF and connected to the gas inlet and outlet tubes of the loop injector. This operation was performed quickly in order to minimize absorption of water by the hygroscopic salt. Results and Discussion Calibration of the apparatus depicted in Figure 1 above yielded the plot shown in Figure 2 below. A linear relation between peak absorbance at 2350 cm -1 and carbon dioxide partial pressure was observed up to ca. A negative deviation from linearity was observed at higher pressures that may be a result of pressure broadening of the spectral feature.
P is the partial pressure of carbon dioxide.
This equation was used to convert absorbances measured during the CO 2 sorption experiments described below. After monitoring the carbon dioxide pressure for ca. 30 min with the loop injector set to bypass the scrubber assembly, the injector valve was switched to redirect flow through the scrubber and a rapid decrease in CO 2 pressure to nearly undetectable levels was observed. 340 min would be required to chemically saturate the sorbent. An unexpected foaming of the molten TMAF occurred approximately 2 h into this experimental run, resulting in blockage of the infrared flow cell's transfer lines and hence preventing further measurements.