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Φασματοσκοπική μελέτη (XPS) καταλυτικών συστημάτων περιβαλλοντικού και ενεργειακού ενδιαφέροντος - μέταλλα μετάπτωσης (Fe, Co, Ni, Cu) υποστηριγμένα σε οξείδιο του δημητρίου (CeO2)

Spyropoulou Eleni

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Summary

In the last decades, the study of surface properties of solid materials consists a peak field of Material Science. The reason lies in the attempt to understand phenomena that take place on solid material surfaces, which find application in research fields such as catalysis, microelectronics, etc.Especially for the area of heterogeneous catalysis is fundamental to understand the surface chemistry of materials, which largely determines the catalytic activity. The deep understanding of the surface structure of the catalyst’s material, is a necessary condition in order to optimize or redevelop advanced catalytic systems.An important category of catalytic materials are transition metals. Furthermore, the use of supports with excellent redox properties, such as cerium oxide (CeO2), is expected to significantly affect the properties of the active phase through metal-support interactions and consequently its cat-alytic reactivity. It is thus necessary to analyze the surface of these materials in order to determine the impact of both the nature of the metal and the metal-support interactions in the surface chemistry of materials.Keeping that in mind, in this thesis are reviewed through surface sensitive techniques such as photoelectron spectroscopy XPS, the surface behavior (chemical composition and oxidation state) of four transition metals (Fe, Co, Ni, Cu) supported on CeO2. This thesis first describes the basic principles and applications of the phenomenon of heterogeneous catalysis. Then, follows a review of catalytic systems based on transition metals and CeO2 and their applications in heterogeneous catalysis. The principles and applications of X-ray photoelectron spectroscopy (X ray Photoelectron Spectroscopy, XPS) are next provided. In the main part of this thesis, the results of the catalytic characterization studies (XPS) of transition metals/CeO2 catalysts are interpreted. XPS studies were carried out in the laboratory of Surface Characterization at Institute of Chemical Engineering Sciences, Patras, Greece. The last part of the thesis concerns the presentation of catalytic applications of materials studied to support the conclusions drawn.

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