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The defence will be in French.
Abstract: Industrial catalysts accelerate chemical reactions in the oil industry, transforming crude oil into finished products such as gasoline, diesel and jet fuel. Understanding the relationships between the structure, chemical composition, properties and functions of catalysts is crucial to reducing the pollution caused by chemical reactions during catalysis. The aim of this thesis is to develop a 3D spectral nano-imaging method to characterize the microstructure of industrial catalysts from the nanometric to the micrometric scale. The method combines X-ray tomography and ptychography with X-ray absorption spectroscopy. It enables the location and chemical state of metals that promote or poison catalysis to be determined. The main challenge lies in reducing data acquisition time, currently around one day for two energy points. The main contribution of the thesis is to develop new methods for faster acquisition without loss of information. This will improve understanding of the relationship between catalyst structure and performance, leading to more efficient and cost-effective developments.
