Abstract
A Na + ion conducting ZSM-5 zeolite is applied as the sensitive phase in a potentiometric gas sensor consisting of the cell Au/(Na 2 CO 3 ,BaCO 3 )/zeolite/Au, where the Na 2 CO 3 /Au system serves as the reference electrode. The cell voltage shows a linear response to changes of the logarithm of propane partial pressure (200-4000 Pa) in CO 2 /O 2 /N 2 at 673 K. The proposed mechanism assumes Na or Na + activity changes in the zeolite pores due to hydrocarbon sorption. An independent effect is a weak response of the zeolite/Au electrode to O 2 and CO 2 due to oxide and carbonate formation.
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