CUED Publications database

Chemi-ionization produced by the catalytic combustion of a hydrocarbon

Axford, SDT and Cai, W and Hayhurst, AN and Collings, N (1991) Chemi-ionization produced by the catalytic combustion of a hydrocarbon. Combustion and Flame, 87. pp. 211-216. ISSN 0010-2180

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A mixture of 1000 p.p.m. propane and air was found to produce gas-phase ions when passed over a platinum filament, heated to ∼ 700°C or more. The ions were detected by direct sampling into a mass spectrometer. No negative ions were observed-only positively charged ones. It appears that these ions originate from chemi-ionization reactions occurring heterogeneously on the surface of the platinum. However, alkali metal impurities in the platinum contribute to the observed mass spectrum of positive ions. The observed spectra contain the relatively stable ions Na + , K + , and H 3 O + and their hydrates. In fact, the original chemi-ions (possibly CHO + ) disappear rapidly and form the more stable ions observed. These studies confirm the usefulness of heated platinum wires for sensing the presence of hydrocarbon gases in air. © 1991.

Item Type: Article
Divisions: Div A > Energy
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:00
Last Modified: 17 May 2018 06:47