Preparation, characterization and reactivity of 1-vanado-ll-molybdo-phosphoric acid supported on mesoporous silicate materials in the propene oxidation

摘要

The H4PMO_(11)VO_(40) 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 H4PMo_(11)V0_(40) was studied in the propene oxidation at 350 °C. It was shown that the presence of H4PMo_(11)V0_(40), modifies the textural properties of mesoporous materials (decrease of surface area) without destroying their structure. The interaction support-heteropolyacid leads to the formation of (SiOH~(2+))(H3PMo_(11)V0_(40)~-) surface