TY  - THES
T1  - An investigation into noble metal free catalysts for diesel particulate filters using combinatorial chemistry and high throughput technology
A1  - Pokorná,Kristina
Y1  - 2009/05/26
N2  - This study is focused on combinatorial chemistry in order to prepare noble metal free catalysts for diesel particulate filters (DPF) and to test them using high throughput technology (HTT). Both methods play an important role in heterogeneous catalysis, since the impending stringent diesel emissions limits must be met and therefore the application of new catalytic coat for DPF is required. In this thesis three different syntheses were studied resulting in the sol-gel process using a commercially available pipetting robot, which is the most applicable for the catalysts'; preparation. Composition spreads of Co, Ce and Mn based mixed oxide have been prepared and simultaneously tested for their relative activity by emissivity corrected infrared thermography (ecIRT), which is an efficient method to indicate potentially good catalyst candidates. The results have been confirmed by thermogravimetric and differential thermal analysis (TG-DTA). The combination of HTT and conventional measurement is excellent, since HTT is a fast method for the discovery and evaluation of soot combustion catalysts and the conventional measurement gives more precise information about the catalytic activity. From 250 prepared catalysts which were tested by ecIRT the compositions of Co/La, Ca/Mn and Ag/Ce were shown to be highly active with regards to soot oxidation. The proper determination by TG-DTA resulted in La5Co95Ox, Ca5Mn95Ox and CeyAg100Ox(y = 45-55) each reducing the combustion temperature to approx. 400 °C. All of these tests were conducted in loose contact mode in order to simulate practical conditions. The investigation of different soot deposition techniques results in the conclusion that contact between soot and catalyst is crucial in the catalytic soot oxidation. 

KW  - High throughput screening
KW  - Kombinatorische Synthese
KW  - Heterogene Katalyse
KW  - Abgaskatalysator
KW  - Rußemission
KW  - Rußfilter
KW  - Sol-Gel-Verfahren
CY  - Saarbrücken
PB  - Universitäts- und Landesbibliothek
AD  - Postfach 151141, 66041 Saarbrücken
UR  - http://scidok.sulb.uni-saarland.de/volltexte/2009/2162
ER  -