マスフイルタの触媒反応への応用

概要

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Performance of a quadrupole mass filter constructed under the suggestion of Paul et al is described with the main object of an application to the study on chemical reactions. With the mass filter having four analysing rods of 8 mmφ × 100mm, gases and vapors with the mass range 1 to 300 and in the pressure range of 10<SUP>-4</SUP> torr to the ultra high vacuum can be analysed in scanning rate of 10<SUP>-3</SUP> to 20 sec/AMU. The mass filter spectra of several organic gases were compared with the standard spectra, the both being found to be nearly same in the cases of gases of mass number less than about sixty. Using the catalytic reaction apparatus connected to the mass filter, a study on flash desorption of the adsorbed layer of iso-propyl alcohol on nickel oxide was carried out. Very small amounts of the desorbed gases such as acetone, propylene, carbon dioxide and so on, could be detected for a few minutes. Discussion was made on the mechanism of catalytic decomposition of iso-propyl alcohol, and it was pointed out that the use of mass filter could be very successful as a monitor of chemical reactions.
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