Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Gregor Beulertz"'
Publikováno v:
Applied Sciences, Vol 5, Iss 3, Pp 174-186 (2015)
Initial studies on aging detection of three way catalysts with a microwave cavity perturbation method were conducted. Two physico-chemical effects correlate with the aging state. At high temperatures, the resonance frequencies for oxidized catalysts
Externí odkaz:
https://doaj.org/article/1077bb21312645bbb5b678e45e68e832
Publikováno v:
Sensors, Vol 12, Iss 3, Pp 2831-2850 (2012)
The accumulating-type (or integrating-type) NOx sensor principle offers two operation modes to measure low levels of NOx: The direct signal gives the total amount dosed over a time interval and its derivative the instantaneous concentration. With a l
Externí odkaz:
https://doaj.org/article/4cb1fe9089d34dc1954bb87b1e73bc96
Publikováno v:
Applied Catalysis B: Environmental. 165:369-377
This paper presents laboratory reactor measurements of the steady-state conversion of the pollutants CO, hydrocarbons and NO over a three-way catalyst containing ceria as an oxygen-storage component. It is shown that the presence of the saturated hyd
Autor:
Jacobus H. Visser, Andrea Groß, Gregor Beulertz, Dominik Hanft, David John Kubinski, Ralf Moos, Isabella Marr
Publikováno v:
Sensors and Actuators B: Chemical. 187:153-161
The accumulating-type or integrating-type NOx sensor works like a dosimeter being well suited for long-term total amount detection of low levels of NO and NO2 while information about the instantaneous NOx concentration is obtained from the signal der
Autor:
Gregor Beulertz, Jürgen Gieshoff, Gunter Hagen, Ralf Moos, Gerhard Fischerauer, Martin Votsmeier, Felix Herbst, Mirko Fritsch
Publikováno v:
Topics in Catalysis. 56:405-409
Three-way catalyst-based automotive exhaust gas aftertreatment is of high importance to meet today’s emission standards. To determine in situ the oxygen loading state of three-way catalysts, a microwave cavity perturbation method is used. In this s
Autor:
Gregor Beulertz, Jürgen Gieshoff, Gunter Hagen, Gerhard Fischerauer, Sebastian Reiß, Martin Votsmeier, Ralf Moos
Publikováno v:
Topics in Catalysis. 56:358-364
The oxygen loading degree in TWCs, the amount of stored ammonia in SCR catalysts, the NOx loading degree in LNTs, or the soot loading of DPFs play a key role in automotive exhaust gas aftertreatment. Today’s methods determine the catalyst state ind
Publikováno v:
Sensors and Actuators B: Chemical. 175:157-162
The accumulating gas sensor principle is a promising concept for selectively measuring low amounts of an analyte by detecting the total amount of the analyte passing the sensor over a given time interval rather than detecting the concentration at any
Autor:
Andrea Groß, Gregor Beulertz, Jacobus H. Visser, Isabella Marr, David John Kubinski, Ralf Moos
Publikováno v:
Sensors; Volume 12; Issue 3; Pages: 2831-2850
Sensors, Vol 12, Iss 3, Pp 2831-2850 (2012)
Sensors (Basel, Switzerland)
Sensors, Vol 12, Iss 3, Pp 2831-2850 (2012)
Sensors (Basel, Switzerland)
The accumulating-type (or integrating-type) NO(x) sensor principle offers two operation modes to measure low levels of NO(x): The direct signal gives the total amount dosed over a time interval and its derivative the instantaneous concentration. With
Publikováno v:
Proceedings IMCS 2012.
A novel strategy for closed-loop controlling the stoichiometric combustion of gasoline engines is presented. In contrast to common strategies which use the signal two lambda probes up- and downstream of a three way catalyst to control the engine, her
Autor:
Andrea Geupel, Gregor Beulertz, David J. Kubinski, Jacobus H. Visser, Ralf Moos, Perena Gouma
Publikováno v:
AIP Conference Proceedings.
To control or monitor processes and the compliance with air quality regulation, highly selective and long‐term stable gas sensors with a high accuracy in the low ppm detection range are needed. Gas sensor techniques detecting the actual concentrati