CHEMI-IONIZATION PRODUCED BY THE CATALYTIC COMBUSTION OF A HYDROCARBON

被引：2

作者：

AXFORD, SDT ^{[1
]}

CAI, W ^{[1
]}

HAYHURST, AN ^{[1
]}

COLLINGS, N ^{[1
]}

机构：

[1] UNIV CAMBRIDGE,DEPT ENGN,CAMBRIDGE CB2 3RA,ENGLAND

来源：

COMBUSTION AND FLAME | 1991年 / 87卷 / 02期

关键词：

D O I：

10.1016/0010-2180(91)90171-7

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

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 approximately 700-degrees-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 H3O+ 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.

引用

页码：211 / 216

页数：6

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