Emission Cleaning from Vehicles using Heterogeneous Catalysis

09:00 AM - 10:00 AM
Louise Olsson, Chalmers University of Technology, Gothenburg, Sweden
National Transportation Research Center Seminar
NTRC, Room D-01
Email: Bill Partridge

This presentation will focus on results from combining experiments and kinetic modeling for reducing emissions from vehicles using catalysis. It is crucial to decrease the emissions of CO2, since it is a green house gas that may increase the global warming. When using oxygen excess during combustion the fuel economy is significantly improved and thereby reducing the CO2 emissions. This is the case for diesel and lean burn gasoline engines. The catalytic system after a diesel engine is today very complex. One possible configuration is to start with a diesel oxidation catalyst (DOC), followed by a diesel particulate filter (DPF) for removing the particles. After this a NOx removal system is added. There are different concepts for removing NOx in oxygen excess, where NOx storage and selective catalytic reduction (SCR) are two important techniques. In this presentation results for NOx storage, ammonia SCR and diesel oxidation catalysts will be shown. Results from different experimental techniques like flow reactor experiments, micro calorimetry, XRD, UV vis TPR will be presented. The experimental results are used for developing kinetic models, which also will be shown. Examples of results that will be discussed are: Synthesis of small pore zeolites, Ammonium nitrate formation/decomposition and N2O production, Phosphorous poisoning of SCR, Hydrothermal aging of SCR, Sulphur promotion of DOC, etc.


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