High-throughput approach to the catalytic combustion of diesel soot |
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Authors: | Eduard Emil Iojoiu Badr Bassou Nolven Guilhaume David Farrusseng Arnold Desmartin-Chomel Karine Lombaert Daniel Bianchi Claude Mirodatos |
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Affiliation: | aInstitut de recherches sur la catalyse et l’environnement de Lyon IRCELYON, UMR5256 CNRS Université Lyon 1, 2 avenue Albert Einstein, F-69626 Villeurbanne Cedex, France;bRenault, Diesel Innovative Catalytic Materials, Direction de l’Ingénierie Matériaux, 1 Allée Cornuel, 91510 Lardy, France |
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Abstract: | A methodology for the evaluation of diesel soot oxidation catalysts by high-throughput (HT) screening was developed. The optimal experimental conditions (soot amount, catalyst/soot ratio, type of contact, composition and flow rate of gas reactants) ensuring a reliable and reproducible detection of light-off temperatures in a 16 parallel channels reactor were set up. The temperature profile measured in the catalyst/soot bed under TPO conditions when the exothermic combustion of soot takes place was shown to provide an accurate measurement of the ignition. Its reproducibility and relevance were checked. The results obtained with a reference noble metal free catalyst (La0.8Cr0.8Li0.2O3 perovskite) agree very well with literature data. Qualitative mechanistic features could be derived from these experiments, stressing the likely limiting step of oxygen transfer from catalyst surface to soot particulates to ignite the soot combustion. Ceria material was shown to be more appropriate than perovskite one. From an HT screening of a large diverse library (over 100 mixed oxides catalysts) under optimized conditions, about 10 new formulations were found to perform better than selected noble metal free reference materials. |
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Keywords: | High-throughput experimentation Parallel reactors Diesel soot catalytic combustion Perovskite and mixed oxide catalysts |
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