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Résumé :
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Copper-containing mesoporous catalysts with an MCM-41 type structure have been prepared using direct hydrothermal synthesis and characterized using XRD, AAS, N2 adsorption−desorption, DRUV−vis, and TEM. All of the samples showed high structural regularity and surface area. Three copper species are presented in these materials: isolated mononuclear Cuδ+ species, oligonuclear [Cuδ+···Oδ−···Cuδ+]n clusters, and bulky CuO oxides. These materials were catalytically tested in isopropanol dehydrogenation, showing good activity and very high selectivity to propanone at 300 °C. A further reduction treatment of the samples allowed us to suggest possible active species. Both the [Cuδ+···Oδ−···Cuδ+]n clusters and the isolated Cuδ+ cations seem to be the species responsible for isopropanol dehydrogenation.
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