Chemistry: analytical and immunological testing – Hydrocarbon – Acyclic
Patent
1985-09-30
1989-09-26
Richman, Barry S.
Chemistry: analytical and immunological testing
Hydrocarbon
Acyclic
436157, 436159, 436160, 436158, 422 94, 422 95, 422 96, 422 97, 73 25, 73 26, 73 27R, G01N 2522
Patent
active
048700258
ABSTRACT:
A method of selectively sensing the quantity of methane gas in an oxygen containing gas stream, which method, as taught in one of its preferred embodiment, includes the step of providing a platinum catalyst (12) and a palladium catalyst (14). The platinum and the palladium catalysts are electrically interconnected (16--16) so as to obtain an electrical output reading (24) therefrom. The electrically interconnected catalysts are heated to a temperature in a range of 350.degree.-450.degree. C. whereby a reference electrical output reading is obtained therefrom. A gas stream containing suspected methane is passed over the electrically interconnected catalysts. Methane gas contained in the gas stream is oxidized only by the palladium catalyst while all other oxidizable components of the gas stream are oxidized by both catalysts. In this manner, the palladium catalyst will be heated to a temperature proportionately higher than the platinum catalyst based on the percentage of methane gas contained in the gas stream. A sample measuring electrical output reading is obtained from the electrically interconnected catalysts while the suspected methane containing gas stream is passing thereover. The sample measuring electrical output reading is compared to the reference electrical output reading to determine the percentage of methane gas contained in the gas stream.
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Hurley Michael D.
Kaiser William J.
Logothetis Eleftherios M.
Ford Motor Company
Johnson William E.
Kummert L.
Richman Barry S.
Sadler Clifford L.
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