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Catalytical reactions and environmental chemistry modifications as seen by synchrotron radiation NAP-XPS

Abstract : The NAP-XPS is a revolutionary new tool that makes possible to use the advantages of a standard XPS analysis (sensitivity to the different chemical elements as well as their states) at a near-ambient pressure (mbar range) thus enabling in situ studies closer to real conditions. Two fields fully benefit from this new machine: environmental chemistry and catalysis. In our case for the field of environmental chemistry we are interested in studying the hydration of so-called swelling clays. I have here demonstrated that it is indeed possible to follow the hydration of counter-ions and highlighted different behavior according to their natures. Moreover, I have been able to demonstrate a beam induced pyridine photolysis phenomenon in the presence of water in these confined media. Concerning catalysis, I studied the oxidation of CO on nanocatalysts composed in particular of platinum an excellent catalyst but sensitive to the CO poisoning. This reaction is for us a prototypical reaction to test the behavior of Pt, Zn, PtZn nanocatalysts. Here, I have been able to determine the onset temperature of the CO oxidation reaction. Moreover, by adding zinc to platinum and forming a bimetallic nanocatalyst, I have improved its resistance to oxidation and proved that zinc alone is also capable of catalyzing the oxidation of CO in the form of creation / destruction of carbonate.
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  • HAL Id : tel-01770411, version 1

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Anthony Boucly. Catalytical reactions and environmental chemistry modifications as seen by synchrotron radiation NAP-XPS. Analytical chemistry. Université Pierre et Marie Curie - Paris VI, 2017. English. ⟨NNT : 2017PA066237⟩. ⟨tel-01770411⟩

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