Description du sujet de thèse

In order to limit the impact of road transport on the climate and reduce carbon dioxide (CO2) emissions, the development of new energy vehicles is becoming crucial and increasingly urgent.
The hydrogen internal combustion engine could be one of the preferred solutions for long-distance trucks, replacing batteries.
However, NOx emissions from H2 internal combustion engines are between 100 and 500 mg NOx/kWh. These emissions are around 10 times lower than those of diesel engines. Despite these very low NOx emissions, they are still too high to comply with the limits imposed by the Euro 7 emissions standard.
A passive NOx adsorption (PNA) system, coupled with conventional post-treatment modules, is one solution being considered. The use of PNA materials is a good solution because the NOx adsorption target is much lower than in the case of diesel engines. Based on the literature on NOx traps for diesel engines, where the basic properties of the materials play a key role, PNAs will be developed to meet the specific requirements of hydrogen engines.

The aim of the project is to propose and develop new materials capable of adsorbing large quantities of NOx at low temperatures and releasing them at higher temperatures for subsequent reduction under the conditions imposed by a hydrogen internal combustion engine.
The aims of the thesis will be to modify commercial materials, characterise them and measure their NOx adsorption and desorption performance in the presence of real mixtures. Particular attention will be paid to adsorption competitions and the effect of ageing. In addition, more in-depth studies will be undertaken on the most efficient shaped catalysts with a view to studying their durability. The systems developed will have to be eco-efficient (regenerable, recyclable).
More specifically, the modification of commercial materials could take the form of functionalisation of supports by ion exchange and/or impregnation methods.
At the same time, non-commercial materials will be synthesised in order to gain a better understanding of adsorption parameters and optimise formulations.

The routine characterisation techniques used will include XRD, TPD and N2 adsorption/desorption, as well as characterisation to identify specific adsorption sites. NOX adsorption/desorption measurements will be carried out mainly on a dedicated bench that can also be used to couple catalytic processes for the post-treatment of gaseous effluents.

Contexte de travail

The thesis will be carried out within the CARE (Pr Anne Giroir-Fendler) and ATARI (Dr Corinne Ferronato) teams at IRCELYON (a joint laboratory between the CNRS and the Claude Bernard Lyon 1 University).
This thesis will be carried out as part of the ANR PIANOS programme coordinated by Professor Anne Giroir-Fendler and in collaboration with the ICGM and IJLRA laboratories and Volvo Powertrain.
The aim of this project is to respond to a challenge in terms of reducing pollutant emissions by passive NOx treatment coupled with DeNOX catalysis for hydrogen internal combustion engines.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.

Contraintes et risques

Eligible candidates must hold or be in the process of obtaining a second-level degree (Master's level or equivalent) giving access to doctoral studies, particularly in materials science, chemistry-physics, chemical engineering or a related field.
Experimental work requiring rigour and compliance with health and safety regulations (laboratory in ZRR).
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Informations complémentaires

PhD in tne context of the PIANOS project