Combustible gas detecting element

Details Combustible gas detecting element Combustible gas detecting element

1983-05-17

1988-03-22

Richman, Barry S.

Chemical apparatus and process disinfecting, deodorizing, preser

Analyzer, structured indicator, or manipulative laboratory...

Means for analyzing gas sample

73 27R, 338 34, 422 98, G01N 2712

Patent

active

047327383

ABSTRACT:
Combustible gas detecting element for detecting the existence of combustible gas such as methane, ethane, propane iso-butane and hydrogen. The element comprises .alpha.-Fe.sub.2 O.sub.3 containing a small amount of sulfate ion (SO.sub.4.sup.--). By using a precipitation process with urea as a precipitant for preparing the above .alpha.-Fe.sub.2 O.sub.3, remarkably high stability and reliability can be released. Addition of quadrivalent metal of Sn, Zr or Ti to the .alpha.-Fe.sub.2 O.sub.3 greatly enhances the gas sensitivity to those gases. Furthermore the sensitivity to carbon monoxide was also enhanced by adding cadmium (Cd) and/or gold (Au).

REFERENCES:
patent: 4045178 (1977-08-01), Okinaka et al.
patent: 4359709 (1982-11-01), Nakatani et al.

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