Solid Electrolyte Hydrocarbon Gas Sensor Using Zeolite as the Sensitive Phase

Zeolite-based Materials for Gas Sensors

“…The cell voltage showed a linear response to the changes of the logarithm of propane partial pressure (200-4000 Pa) in CO 2 /O 2 /N 2 at 673 K. A mechanism was proposed based on the changes of Na or Na + activity 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 the formation of oxide and carbonate [34]. The FAU type zeolite doped with platinum by ion-exchange has been used as a gassensitive layer material on a thin-film inter-digital capacitors (IDCs).…”

Potentiometric hydrocarbon gas sensing characteristics of sodium ion conducting zeolite ZSM-5

“…Recently, sodium ion conducting zeolite has been introduced as a novel sensitive phase for this type of sensor for the detection of hydrocarbons [3]. Zeolites have already been known as sensitive materials for capacitive or resistive gas sensors [4,5].…”

“…Zeolites have already been known as sensitive materials for capacitive or resistive gas sensors [4,5]. In connection with investigations of impedance-based hydrocarbon sensors [6,7], we had found that the Na + ion conducting zeolite Na-ZSM-5 (framework type: MFI, sum formula: Na n [Al n Si 96−n O 192 ]·x H 2 O) shows a potentiometric response to alkane gases in a device using a carbonate/Au reference electrode [3]. This zeolite consists of a three-dimensional crystalline silicon-oxygen framework, forming a system of interconnected channels, into which molecules with kinetic diameters up to 0.7 nm [8] can enter and sorb.…”

“…In our previous investigation [3], the electrochemical cell Au|Na 2 CO 3 , BaCO 3 |Na-ZSM-5|Au was used, where a carbon- * Corresponding author. Tel.…”

“…This configuration led to an ambiguity about the separation of the contributions of reference and measurement electrode to the overall voltage signal. Assuming an ideal response of the reference electrode to CO 2 and O 2 , it was concluded that the zeolite/Au electrode shows a pronounced response to propane partial pressure changes and only a small response to O 2 and CO 2 [3].…”