Sensor for on-line in situ measurement of soot concentration in flue gases

Vogel, Alexandra; Schüle, V.; Baier, Grit; Mahl, Adam

doi:10.1016/0925-4005(93)01081-e

Cited by 10 publications

(4 citation statements)

References 1 publication

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“…A potentiometric sensor [10] was used by Vogel and coworkers to detect the soot by burning of soot particulates at the working electrode (zirconia) and measuring the resulting electromagnetic force (e.m.f) in the sensor material. Optical detection [11] is another alternative patented by Schittenhelm, by measuring the decrease of the reflective capacity of a solid surface. The measurement of the electrical resistance of a soot layer deposited between two electrical contacts as a measure of the deposited amount of soot has been used in several patents [12,13].…”

Section: Introductionmentioning

confidence: 99%

Detection of Soot Using a Resistivity Sensor Device Employing Thermophoretic Particle Deposition

Lutic¹,

Pagels²,

Björklund³

et al. 2010

Journal of Sensors

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Results are reported for thermophoretic deposition of soot particles on resistivity sensors as a monitoring technique for diesel exhaust particles with the potential of improved detection limit and sensitivity. Soot with similar characteristics as from diesel exhausts was generated by a propane flame and diluted in stages. The soot in a gas flow at 240–270C∘was collected on an interdigitated electrode structure held at a considerably lower temperature, 105–125C∘. The time delay for reaching measurable resistance values, the subsequent rate, and magnitude of resistance decrease were a function of the distance between the fingers in the electrodes and the degree of dilution of the soot containing flow. Soot deposition and subsequent removal by heating the sensor support was also performed in a real diesel exhaust. Good similarities between the behavior in our laboratory system and the real diesel exhaust were noticed.

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Section: Introductionmentioning

confidence: 99%

Detection of Soot Using a Resistivity Sensor Device Employing Thermophoretic Particle Deposition

Lutic¹,

Pagels²,

Björklund³

et al. 2010

Journal of Sensors

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“…In urban environments, optical methods are used for monitoring the soot concentration567; however, they require complicated and expensive equipment. Several simpler potentiometric and amperometric soot sensors that employ solid electrolytes (yttria-stabilized zirconia89 and SnP 2 O 7 10111213), an electrical insulator (alumina)141516, or a semiconductor (GaN)17 have been proposed. One such sensor, which consists of proton-conducting Sn 0.9 In 0.1 H x P 2 O 7-δ or SnP 2 O 7 -SnO 2 solid electrolyte, produces active oxygen at a Pt sensing electrode via the anodic water vapor oxidation reaction.…”

mentioning

confidence: 99%

A self-regenerable soot sensor with a proton-conductive thin electrolyte and a nanostructured platinum sensing electrode

Ito

Oogushi

et al. 2016

Sci Rep

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In recent years, exhaust sensors have become increasingly attractive for use in energy and environmental technologies. Important issues regarding practical applications of these sensors, especially for soot measurements, include the further development of ion-conductive electrolytes and active electrode catalysts for meeting performance and durability requirements. Herein, we design a proton conductor with a high breakdown voltage and a sensing electrode with high sensitivity to electrochemical carbon oxidation, enabling continuous soot monitoring with self-regeneration of the sensor. A Si0.97Al0.03HxP2O7-δ layer with an excellent balance between proton conductivity and voltage endurance was grown on the surface of a Si0.97Al0.03O2-δ substrate by reacting it with liquid H3PO4 at 600 °C. Specific reactivity of the electrochemically formed active oxygen toward soot was accomplished by adding a Pt-impregnated Sn0.9In0.1HxP2O7-δ catalyst into a Pt sensing electrode. To make the best use of these optimized materials, a unipolar electrochemical device was fabricated by configuring the sensing and counter electrodes on the same surface of the electrolyte layer. The resulting amperometric mode sensor successfully produced a current signal that corresponded to the quantity of soot.

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“…(4)(5)(6) Therefore, to guarantee the efficient and stable operation of a diesel engine system with C-DPF after-treatment, on-board PM monitoring technology is required. (3,7,8) For this reason, several soot detection technologies have been proposed by researchers in the last few decades. Potentiometric and amperometric soot sensors based on an oxide ion conductor (zirconia) and electrical insulator were proposed by Vogel and colleagues (8,9) and Moss and colleagues, (10)(11)(12) and these can be used for in situ measurements of soot concentration.…”

Section: Introductionmentioning

confidence: 99%

“…(3,7,8) For this reason, several soot detection technologies have been proposed by researchers in the last few decades. Potentiometric and amperometric soot sensors based on an oxide ion conductor (zirconia) and electrical insulator were proposed by Vogel and colleagues (8,9) and Moss and colleagues, (10)(11)(12) and these can be used for in situ measurements of soot concentration. Sensors based on the electromagnetic wave method, which includes radio-frequency (RF) (13,14) and optical waves in terms of changing the light transmission, scattering or extinction, have also been used to monitor PM concentration.…”

Section: Introductionmentioning

confidence: 99%

Sensing of Soot Oxidation by Using Combustion-Type Sensor with Ag-Supported Catalyst

2016

Sensors and Materials

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Soot-sensing properties of the combustion-type sensor coated with Ag-supported catalysts (Ag/TiO 2 , Ag/α-Al 2 O 3 , and Ag/CeO 2 ) were investigated. The catalyst with a high carbon black (CB) oxidation activity in the tight contact (TC) mode had a high response speed, although the response speed had no relationship with the CB oxidation activity in the loose contact (LC) mode. Moreover, the difference in CB oxidation activities between TC and LC modes was consistent with the difference in response speed between V 10 and V 50 , where V 10 and V 50 indicate the response speed of the CB oxidation at 10 and 50% of total output voltage. The catalyst with high intrinsic CB combustion activity improves the response property at initial combustion. On the other hand, the catalyst with the CB combustion activity, which does not depend on the contact state between the CB and the catalyst, improves the response property at later combustion.

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Sensor for on-line in situ measurement of soot concentration in flue gases

Cited by 10 publications

References 1 publication

Detection of Soot Using a Resistivity Sensor Device Employing Thermophoretic Particle Deposition

Detection of Soot Using a Resistivity Sensor Device Employing Thermophoretic Particle Deposition

A self-regenerable soot sensor with a proton-conductive thin electrolyte and a nanostructured platinum sensing electrode

Sensing of Soot Oxidation by Using Combustion-Type Sensor with Ag-Supported Catalyst

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