Thesis defense: Guillaume PETAUD


Thesis defense of Guillaume PETAUD 07/11/2019 at 14h0 Room Fontannes of Lyon1 university

Title : Selective Catalytic Reduction of nitrogen oxides using ammonia: kinetic, mechanism and modelling of copper chabazite-based systems

Jury :
Briançon, Stéphanie Professeur des Universités, Université Claude Bernard Lyon 1, Villeurbanne Examinatrice
Brilhac, Jean-François Professeur des Universités, Université de Haute-Alsace Rapporteur
Da Costa, Patrick Professeur des Universités, Sorbonne Université, Paris Examinateur
Delahay, Gérard Directeur de Recherche ENSC Montpellier Rapporteur
Iojoiu, Eduard Emil Ingénieur Renault Trucks-Volvo, Saint Priest Examinateur
Schweitzer, Jean-Marc Ingénieur IFPEN, Solaize Invité
Giroir-Fendler, Anne Professeure des Universités, Université Claude Bernard Lyon 1, Villeurbanne Directrice de thèse
Gil Villarino, Sonia Maître de Conférence, Université Claude Bernard Lyon 1, Villeurbanne 1 Co-Directrice de thèse
Tayakout-Fayolle, Mélaz Professeure des Universités, Université Claude Bernard Lyon 1, Villeurbanne Co-Directrice de thèse

Summary
The reduction of atmospheric pollution from stationary and mobile engines is a serious challenge associated with stringent environmental regulations. For nitrogen oxides (NOx) abatement in particular, the selective catalytic reduction using urea or ammonia (urea- or NH3-SCR) over copper- and iron-based catalysts is one of most effective and economic technologies. In this respect, revisiting after-treatment systems by a deep comprehension of the catalyst behavior at different scale may significantly improve their eco- and health-friendliness. This study targets the development of a multi-site kinetic model using a series of copper chabazite-based catalysts, as a selected model SCR catalyst. To qualify these materials as beyond-state-of-the-art catalysts and to better understand the impact on different active site configurations, three catalysts were synthetized by different preparation methods (impregnation, ionic exchange and one-pot), finely characterized by different techniques and their ability to abate NOx via the ubiquitous NH3-SCR reaction was extensively assessed under several operating conditions. Each catalyst behavior was quantified and associated to their respective main active sites (five different configurations described). The diffusion, water impact, adsorption competition between key reactants and storage sites were also ones of the main points spotlighted in this study. In-situ characterization of these catalysts was also performed, using Diffuse Reflectance Infrared Fourier-Transform Spectroscopy (DRIFTS) to understand the surface dynamical properties of the catalyst, and to unveil the mechanism of the catalytic processes.

Keywords: Active sites, Selective Catalytic Reduction, Atmospheric pollution, Kinetic model, In-situ DRIFTS

Date/heure
Date(s) - 7 Nov 2019
14 h 00 min - 16 h 00 min

Emplacement
Salle Fontannes, Université de Lyon1

Catégories

Filed under: Defense