TY  - THES
T1  - Preferential oxidation of carbon monoxide in microchannels : development of catalysts for the low temperature regime and kinetic study
A1  - Nikolaidis,Georgios
Y1  - 2008/03/10
N2  - The aim of this work was to optimize the synthesis of Au/MeOx and Zeolite-based catalysts for the preferential oxidation reaction of carbon monoxide for low temperature fuel cells and to evaluate whether the high activity and selectivity observed in idealized methanol-reformate (CO, O2 and H2) are also maintained under more realistic conditions (CO, O2, H2, up to 20 Vol.% CO2, and 10 — 20 Vol.% H2O). Among the catalysts tested, the Au/Co3O4 catalyst was the most active and sensitive in the presence of carbon dioxide, while Pt-Rh/g-Al2O3 and Pt0.5Al1Mn7Co91.5Ox were found to oxidize carbon monoxide effectively in the presence of hydrogen and carbon dioxide.
Another novel aspect of this work are the experiments for the kinetic study of the preferential oxidation reaction of carbon monoxide, which were performed applying catalyst coating in micro reactors. A recycle reactor was constructed to study the kinetics of the reaction. The predictions of the residence time distribution (RTD) for a CSTR simulated by a microreactor with a recycle stream, has been shown to give an adequate approximation of the experimental measurements. Linear regression analysis was used to develop a kinetic model and to validate all the required parameters. The kinetics of the preferential carbon monoxide oxidation and hydrogen oxidation on Pt-Rh/g-Al2O3 catalyst in simulated reformer gas in the microreactors was well described by a simple power-law expression.
KW  - Reaktionskinetik
KW  - Kreislaufreaktor
KW  - Verweilzeitverteilung
KW  - Zeolith
KW  - Katalysator
KW  - Kohlenmonoxid
KW  - Oxidation
CY  - Saarbrücken
PB  - Universitäts- und Landesbibliothek
AD  - Postfach 151141, 66041 Saarbrücken
UR  - http://scidok.sulb.uni-saarland.de/volltexte/2008/1467
ER  -