Greffage de molécules azotées sur des structures carbonées à porosité hierarchisée

Abstract : In this work, we studied the surface chemistry of porous carbons functionalized firstly with oximes and amidoximes and then with guanidine. We focused this work on the understanding and quantification of these functionalization with thermal analysis and more particularly by Temperature Programmed Desorption/Mass Spectrometry (TPD-MS). Subsequently, we evaluated the interest of guanidine functionalization of mesoporous carbons for two applications : the capture of CO2 and the ability to synthesize and stabilize metal nanoparticles. For the first application, CO2 adsorption tests at 0 ° C. and 20 ° C. at 1 bar were carried out on a mesoporous carbon oxidized under air in the presence or absence of guanidine. The intensity of interactions (physisorption versus chemisorption) was probed by isosteric adsorption heat calculations. For the second applications, we used oxidized mesoporous carbons with or without guanidine to synthesize silver nanoparticles less than 2 nm in size and relatively monodisperse in size. Bimetallic AgCu particles were also obtained from these mesoporous carbon matrices impregnated with guanidine. A beneficial role of guanidine on the reduced copper content has been shown here. In situ TEM has also been carried out in order to evaluate the thermal stability of these nanoparticles and to understand the interest of the functionalization on the sintering of these nanoparticles. Finally, catalytic tests for the selective epoxidation of styrene were also performed on these materials. The preliminary results are very promising for a catalyst preparation process and very simple to implement.
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Assia Nouar. Greffage de molécules azotées sur des structures carbonées à porosité hierarchisée. Chimie inorganique. Université de Strasbourg, 2019. Français. ⟨NNT : 2019STRAE009⟩. ⟨tel-02307603⟩

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