Sensor Tool for Fast Catalyst Material Characterization
- 95 Downloads
For the development of catalyst materials a novel sensor tool is presented. It can determine catalyst light-off temperatures. The device measures temperature changes (exothermicities) due to catalytic reactions of the material which is coated on a very small catalyst coating area directly on the sensor device. By temperature modulation via an integrated heater, light-off temperature characteristics can be determined within a few minutes. In the present contribution, the sensor setup is introduced and several experimental results for an exemplarily investigated Pt-loaded Al2O3 catalyst are shown with typical exhaust gas components and with mixtures of their components in a lean base gas atmosphere. Several typical findings are light-off hysteresis, CO poisoning, alkane light-off-behavior or acetylene poisoning.
KeywordsThermoelectric LTCC sensor On-board diagnostics (OBD) Diesel oxidation catalyst (DOC) Three way catalyst (TWC) Exothermicity sensor Temperature programmed desorption (TPD)
- 8.Kita J, Engelbrecht A, Schubert F, Groß A, Rettig F, Moos R (2015) Some practical points to consider with respect to thermal conductivity and electrical resistivity of ceramic substrates for high-temperature gas sensors. Sens Actua B Chem 213:541–546. doi:10.1016/j.snb.2015.01.041 CrossRefGoogle Scholar
- 9.Burns GW, Strouse GF, Liu BM, Mangum BW (1992) Gold versus platinum thermocouples: performance data and an ITS-90 based reference function. Temp Meas Control Sci Ind 5:531–536Google Scholar
- 12.Etheridge JE, Watling TC (2015) Is reactor light-off data sufficiently discriminating between kinetic parameters to be used for developing kinetic models of automotive exhaust aftertreatment catalysts? the effect of hysteresis induced by strong self inhibition. Chem Eng J 264:376–388. doi:10.1016/j.cej.2014.11.089 CrossRefGoogle Scholar