2017
DOI: 10.3390/s17122746
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Radio-Frequency-Controlled Urea Dosing for NH3-SCR Catalysts: NH3 Storage Influence to Catalyst Performance under Transient Conditions

Abstract: Current developments in exhaust gas aftertreatment led to a huge mistrust in diesel driven passenger cars due to their NOx emissions being too high. The selective catalytic reduction (SCR) with ammonia (NH3) as reducing agent is the only approach today with the capability to meet upcoming emission limits. Therefore, the radio-frequency-based (RF) catalyst state determination to monitor the NH3 loading on SCR catalysts has a huge potential in emission reduction. Recent work on this topic proved the basic capabi… Show more

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Cited by 10 publications
(7 citation statements)
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“…It has been shown for all types of SCR catalyst materials that this decisive parameter can be determined directly, independently on the feed ratio [12][13][14]. Recently, even a fully rf-controlled system has been realized [15,16]. Besides the resonant frequency, the quality factor is also an appropriate means that even allows control of the system at higher conversion without gas sensor [17].…”
Section: (2) Ammonia Scr-catalysts and Lean Nox Trapsmentioning
confidence: 99%
“…It has been shown for all types of SCR catalyst materials that this decisive parameter can be determined directly, independently on the feed ratio [12][13][14]. Recently, even a fully rf-controlled system has been realized [15,16]. Besides the resonant frequency, the quality factor is also an appropriate means that even allows control of the system at higher conversion without gas sensor [17].…”
Section: (2) Ammonia Scr-catalysts and Lean Nox Trapsmentioning
confidence: 99%
“…Besides filter monitoring, the RF sensor is also suitable for catalyst state determination [ 22 ]. Thus, the ammonia loading of selective catalytic reduction (SCR) catalysts or the oxygen storage of three-way catalytic converters (TWCs) can be measured [ 16 , 23 , 24 , 25 , 26 ]. Even the simultaneous evaluation of two different parameters is possible, as can be shown with the nitrogen oxide and the oxygen storage of a lean NO x trap (LNT) [ 27 , 28 ].…”
Section: Introductionmentioning
confidence: 99%
“…They can perform real-time measurement and onboard diagnostics as well as feedback control operation based on soot and ash level. Additionally, the RF technique has been used to measure NH3 loading on the SCR catalyst [2,15,16,17,18] In these reports, the changes in the dielectric properties of the catalyst due to changes in the ammonium ions on the SCR surfaces are monitored by changes in the RF resonant frequencies and the RF attenuation.…”
Section: Introductionmentioning
confidence: 99%