Strategies for total NOx measurement with minimal CO interference utilizing a microporous zeolitic catalytic filter

Szabo, Nicholas F; Dutta, Prabir K.

doi:10.1016/s0925-4005(02)00322-2

Cited by 79 publications

(41 citation statements)

References 26 publications

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“…The NO sensor is based on a potential response to the gas, which is exposed on an electrochemically active interface of yttria stabilized zirconia with a zeolite (YSZ). The zeolite plays the role of promoting the NO/NO 2 equilibrium prior to the gases reaching the interface [24,25]. The mixed potential generated is logarithmically related to NO in the concentration range of 0~1000 ppm at 773~973 K. The micro porosity of the zeolite makes it permeable to oxygen, thus minimizing the interference of this species.…”

Section: Iv) No and So 2 Sensorsmentioning

confidence: 99%

A novel approach for Zeolite-based Materials for Gas Sensors

Mohan¹

2013

IOSR-JESTFT

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This paper deals with the uses of zeolites and zeolite-based materials for developing gas sensors. The purpose of using zeolites in sensors is usually to improve sensitivity and selectivity by preferential adsorption, in addition, thin films assure a fast response time of the sensor. The compound or cluster sensing towards a gas assembled into the cages or channels of zeolites property of the materials were disussed in this paper. The possibility of these materials is tinted and avenues for further research are suggested.

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Section: Iv) No and So 2 Sensorsmentioning

confidence: 99%

A novel approach for Zeolite-based Materials for Gas Sensors

Mohan¹

2013

IOSR-JESTFT

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“…Another transition metal oxide used as the electrode material in NO x sensors is Cr 2 O 3 [275][276][277][278][279][280][281]. Other binary oxides used for NO x sensors include ZnO [264], V 2 O 5 [282], and SnO 2 [278,279], which has also been used for CO sensors [283].…”

Section: Electrocatalytic Electrodesmentioning

confidence: 99%

“…This effect can be corrected for if the oxygen content is known, but the presence of oxygen decreases the magnitude of the sensor response, which may reduce the signal-to-noise ratio of the sensor output. One approach to improving selectivity is to use a porous zeolite on the electrode [168,281,341,342]. In addition to using the controlled porosity to preferentially control the relative diffusion rates of different species, the zeolite can be loaded with catalysts to promote the desired chemical reaction.…”

Section: Log [Co] (Ppm)mentioning

confidence: 99%

Electrochemical Sensors: Fundamentals, Key Materials, and Applications

Fergus

2009

Solid State Electrochemistry I

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Solid electrolytes are well suited for use in chemical sensors for high-temperature applications. The first such sensors followed from the use of solid electrolytes for thermodynamic measurements, and are based on galvanic cells, for which the open circuit voltage is related to the concentration of the mobile ionic species, or to another target species through equilibration at the electrode surface. However, sensors can also be based on nonequilibrium, but steady-state, potentials established between electrochemical reactions at the electrode. Another approach is to use the current passing through the electrolyte, rather than the voltage across the electrolyte, as the sensor signal. In this chapter we first describe the different methods for using solid electrolytes in chemical sensors, and then discuss some of the materials challenges and example applications. IntroductionMore than 50 years ago, Kiukkola and Wagner [1] demonstrated that solid electrolytes couldbeusedingalvaniccellstomeasurethethermodynamicpropertiesofoxides.Those pioneering studies subsequently led to the more practical application of solid electrolytes in chemical sensors. The ionic conduction in solid electrolytes is thermally activated and thus its rate increases with increasing temperature; consequently, solid electrolytes are well suited for high-temperature applications. On the other hand, such temperature dependencealsomeansthatsensorsbasedonsolidelectrolytescanrespondsluggishlyor may be inoperable at low temperatures. However, one of the advantages of solid-state devices, such as those based on solid electrolytes, is that they can be miniaturized [2,3]. Decreasingthedevicedimensionsreducesdiffusionlengths,whichinturndecreasesthe response time and thus also the minimum operating temperature.Ionic conducting solids can be used in a variety of different types of sensor [4][5][6][7][8][9][10][11][12]. Solids forwhichthe ionicconductivity is much largerthanthe electronic conductivity can Solid State Electrochemistry I: Fundamentals, Materials and their Applications. Edited by Vladislav V. Kharton

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“…The NO sensor is based on a potential response to the gas, which is exposed on an electrochemically active interface of yttria stabilized zirconia with a zeolite (YSZ). The zeolite plays the role of promoting the NO/NO 2 equilibrium prior to the gases reaching the interface [24,25]. The mixed potential generated is logarithmically related to NO in the concentration range of 0~1000 ppm at 773 ~ 973 K. The microporosity of the zeolite makes it permeable to oxygen, thus minimizing the interference of this species.…”

Section: No and So 2 Sensorsmentioning

confidence: 99%