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72 Chapter 5 Results and discussion continuous sample is not observed. Alternatively the pumping speed of the vacuum system for gases is related to their mass and may cause mass discrimination. In both these cases argon at mass 40 may be expected to show trends similar to CO2• This is not evident from the results. There may be some contaminant present in the mass spectrometer chamber which is interfering with the 44 peak. A background scan up to mle 100 was done and showed no unusual peaks. It may be that at some time in the operation of the vacuum-mass spectrometer system back-streaming of diffusion pump oil vapour has occurred leaving fractionated components in the mass spectrometer chamber. Si+ at mle 28 and SiO+ at 44 may be expected fractionated components of the silicon based DC705 diffusion pump oil used. The main peaks in the actual spectrum for DC705 as listed by VG Quadrupoles[106] are given in Table 5.4. Table 5.4 Main peaks in DC705 diffusion pump oil spectrum. mle 39 43 76 78 relative 73 59 83 100 abundance Of these peaks the only interference may be expected from the 43 peak. Figure 5.13 shows that the 43 peak does not show any comparable increase with time. A possible reaction mechanism involving CO and CO2 could be CO+H20 ~ CO2+H2 (5.9) At sample pressures of 1x10-6 torr the average mean free path for air molecules at 20°C may be approximated at 50m. Under these conditions the occurrence of any chemical reaction is considered extremely unlikely. Preferential adsorption of CO2 from the introduced sample may occur. To avoid this all surfaces in the mass spectrometer chamber are maintained at 60-90°C while sampling. This procedure, reported used previously by Reed[107], reports the use of mass spectrometer chamber heating up to 150°C for continuous process monitoring of water, CO2 and NH3• Adsorption of CO2 on the filaments in the mass spectrometer and ion gauge has been suggested earlier. Since the mass spectrometer filament is on and therefore hot during the measurements adsorption on this filament is unlikely. The ion gauge filament is maintained offwhile analysing samples because this filament functions as an ion source. The ions generated by this ion gauge filament interfere with the reading of ions generated by the mass spectrometer ion source. There is a second filament in the ion gauge which is the de-gassing filament. This filament is maintained 5 offwhile sampling because operating at the high pressure ofthe sample (10- ) will cause this filament to vaporize rapidly. De-gassing the ion gauge filament after samplingPDF Image | CO2 removal from air for alkaline fuel cells operating with liquid H2
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