Préparation, caractérisation et réactivité de l’acide 1-vanado-11-molybdo-phosphorique supporté sur des matériaux silicatés mésoporeux dans l’oxydation du propène

Abstract: The H4PMo11VO40 heteropolyacid (HPA) was supported at 30wt.% by the dry impregnation method on HMS, CMI-1 and SBA-15 mesoporous materials. The state of the HPA and those of the supports were examined by nitrogen physisorption, X-ray diffraction, (DR) FT–IR and X-ray photoelectron spectroscopies, thermal analysis (TG–ATD) and scanning electron microscopy (SEM). The effect of support on the catalytic behavior of H4PMo11VO40 was studied in the propene oxidation at 350°C. It was shown that the presence of H4PMo11VO40, modifies the textural properties of mesoporous materials (decrease of surface area) without destroying their structure. The interaction support–heteropolyacid leads to the formation of (SiOH2+)(H3PMo11VO40 −) surface species more stable than H4PMo11VO40 species and that appear to be the active sites in the propene oxidation. [Copyright &y& Elsevier]