| 摘要 |
A sensor for selectively detecting HC classes, e.g., alkanes, alkenes and aromatics, in a gas mixture comprising a metal oxide seiniconductor catalyst which is catalytically active for the selective HC classes; the reactions selected from the group consisting of partial oxidation, oxidative dehydrogenation, oxidative coupling and isomerization. Each of these reactions results in imparting a change in the electrical conductivity of the metal oxide which is proportional to the concentration of the HC in the gas mixture. Suitable metal oxide catalysts include Bi2O3-MoO3, CoO-MoO3, SnO2-MoO3, TeO2-MoO3, Sb2O5-V2O5-MoO3, SnO2-Sb2O5, Nb2O-V2O5-MoO3, V2O5-MoO3, ZnO-Fe2O3, Li2O-MgO, V2O5-P2O5, metal oxide compounds of a spinel or perovskite crystalline structure, and mixtures thereof. A method carried out by the sensor comprises the following steps: (1) contacting the gas mixture with a metal oxide semiconductor catalyst capable of initiating chemisorption and/or at least one catalytic reaction of a selected hydrocarbon class; and, thereafter measuring the resultant change in the electrical conductivity of the metal oxide and thereafter converting the change to the concentration of the total non-methane hydrocarbons in the gas mixture.
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