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Dosimeter-type NOx sensing properties of KMnO4 and its electrical conductivity during temperature programmed desorption.

Groß A, Kremling M, Marr I, Kubinski DJ, Visser JH, Tuller HL, Moos R - Sensors (Basel) (2013)

Bottom Line: An impedimetric NOx dosimeter based on the NOx sorption material KMnO4 is proposed.With this dosimeter, low levels of NO and NO2 exposure can be detected electrically as instantaneous values at 380 °C by progressive NOx accumulation in the KMnO4 based sensitive layer.The linear NOx sensing characteristics are recovered periodically by heating to 650 °C or switching to rich atmospheres.

View Article: PubMed Central - PubMed

Affiliation: Zentrum für Energietechnik, Bayreuth Engine Research Center (BERC), Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany. andrea.gross@uni-bayreuth.de

ABSTRACT
An impedimetric NOx dosimeter based on the NOx sorption material KMnO4 is proposed. In addition to its application as a low level NOx dosimeter, KMnO4 shows potential as a precious metal free lean NOx trap material (LNT) for NOx storage catalysts (NSC) enabling electrical in-situ diagnostics. With this dosimeter, low levels of NO and NO2 exposure can be detected electrically as instantaneous values at 380 °C by progressive NOx accumulation in the KMnO4 based sensitive layer. The linear NOx sensing characteristics are recovered periodically by heating to 650 °C or switching to rich atmospheres. Further insight into the NOx sorption-dependent conductivity of the KMnO4-based material is obtained by the novel eTPD method that combines electrical characterization with classical temperature programmed desorption (TPD). The NOx loading amount increases proportionally to the NOx exposure time at sorption temperature. The cumulated NOx exposure, as well as the corresponding NOx loading state, can be detected linearly by electrical means in two modes: (1) time-continuously during the sorption interval including NOx concentration information from the signal derivative or (2) during the short-term thermal NOx release.

No MeSH data available.


Related in: MedlinePlus

Data analysis for eTPD: (a) time dependence of conductance log G and outlet NOx concentration creleased, (b) determination of released amount Areleased and electrical response FG, (c) FG as a function of Areleased.
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f8-sensors-13-04428: Data analysis for eTPD: (a) time dependence of conductance log G and outlet NOx concentration creleased, (b) determination of released amount Areleased and electrical response FG, (c) FG as a function of Areleased.

Mentions: eTPD on KMnO4/La-Al2O3 is performed with the experimental arrangement shown in Figure 2. The eTPD related data and their evaluation are summarized in Figure 8.


Dosimeter-type NOx sensing properties of KMnO4 and its electrical conductivity during temperature programmed desorption.

Groß A, Kremling M, Marr I, Kubinski DJ, Visser JH, Tuller HL, Moos R - Sensors (Basel) (2013)

Data analysis for eTPD: (a) time dependence of conductance log G and outlet NOx concentration creleased, (b) determination of released amount Areleased and electrical response FG, (c) FG as a function of Areleased.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3673092&req=5

f8-sensors-13-04428: Data analysis for eTPD: (a) time dependence of conductance log G and outlet NOx concentration creleased, (b) determination of released amount Areleased and electrical response FG, (c) FG as a function of Areleased.
Mentions: eTPD on KMnO4/La-Al2O3 is performed with the experimental arrangement shown in Figure 2. The eTPD related data and their evaluation are summarized in Figure 8.

Bottom Line: An impedimetric NOx dosimeter based on the NOx sorption material KMnO4 is proposed.With this dosimeter, low levels of NO and NO2 exposure can be detected electrically as instantaneous values at 380 °C by progressive NOx accumulation in the KMnO4 based sensitive layer.The linear NOx sensing characteristics are recovered periodically by heating to 650 °C or switching to rich atmospheres.

View Article: PubMed Central - PubMed

Affiliation: Zentrum für Energietechnik, Bayreuth Engine Research Center (BERC), Department of Functional Materials, University of Bayreuth, 95440 Bayreuth, Germany. andrea.gross@uni-bayreuth.de

ABSTRACT
An impedimetric NOx dosimeter based on the NOx sorption material KMnO4 is proposed. In addition to its application as a low level NOx dosimeter, KMnO4 shows potential as a precious metal free lean NOx trap material (LNT) for NOx storage catalysts (NSC) enabling electrical in-situ diagnostics. With this dosimeter, low levels of NO and NO2 exposure can be detected electrically as instantaneous values at 380 °C by progressive NOx accumulation in the KMnO4 based sensitive layer. The linear NOx sensing characteristics are recovered periodically by heating to 650 °C or switching to rich atmospheres. Further insight into the NOx sorption-dependent conductivity of the KMnO4-based material is obtained by the novel eTPD method that combines electrical characterization with classical temperature programmed desorption (TPD). The NOx loading amount increases proportionally to the NOx exposure time at sorption temperature. The cumulated NOx exposure, as well as the corresponding NOx loading state, can be detected linearly by electrical means in two modes: (1) time-continuously during the sorption interval including NOx concentration information from the signal derivative or (2) during the short-term thermal NOx release.

No MeSH data available.


Related in: MedlinePlus