| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1489565 | Materials Research Bulletin | 2011 | 7 Pages |
A new heterogeneous catalyst (PVMo/Bentonite) consisting of vanadium substituted heteropolymolybdate with Keggin-type structure Na5[PV2Mo10O40]·14H2O (PVMo) supported between silicate layers of bentonite has been synthesized by impregnation method and characterized using X-ray diffraction, Fourier-transformed infrared spectroscopy, scanning electron microscopy, UV–vis diffuse reflectance spectroscopy, transmission electron microscopy and elemental analysis. X-ray diffraction and scanning electron microscopy analysis indicated that PVMo was finely dispersed into layers of bentonite as support. The PVMo/Bentonite used as an efficient heterogeneous catalyst for epoxidation of alkenes. Various cyclic and linear alkenes were oxidized into the corresponding epoxides in high yields and selectivity with 30% aqueous H2O2. The catalyst was reused several times, without observable loss of activity and selectivity. The obtained results showed that the catalytic activity of the PVMo/Bentonite was higher than that of pure heteropolyanion (PVMo).
Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► The PVMo and nanocomposite catalyst (PVMo/Bentonite) as catalyst for epoxidation of alkenes. ► The composite catalyst showed higher catalytic activity than parent heteropolymolybdate (PVMo). ►The use of ultrasonic irradiation increased the conversions and reduced the reaction times. ► The H2O2 is a green and eco-friendly oxidant in this catalytic system.
