One-pot synthesis of naturanol from α-pinene oxide on bifunctional Pt-Sn/SiO2 heterogeneous catalysts. Part I: The catalytic system

摘要: Abstract Bifunctional Pt-Sn/SiO2 catalysts with different Sn/Pt ratios have been prepared by co-impregnation, reduced in H2 and tested means of the one-pot synthesis α-campholenic alcohol (naturanol) from α-pinene oxide. All results are reported two sections. In Part I, here presented, characterization terms microstructure chemical surface properties X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature programmed reduction (TPR), photoelectron spectroscopy (XPS) acid investigated FT-IR adsorbed pyridine included. catalysts, oxidized and/or metallic species, having microstructural characteristics, strongly dependent on ratio identified. For A clear relationship between intensity bands activity oxide isomerization was observed indicating that Lewis sites, associated ionic tin present bifunctional active centres favouring reaction. Sn addition also increases selectivity to naturanol, subsequent consecutive hydrogenation campholenic aldehyde intermediate. However, at high loading, effect is less significant because excess decreases catalytic activity. Our indicate key factor influences both naturanol