Oxidative Desulfurization of Dibenzothiophene Using Dawson TypeudHeteropoly Compounds/Tantalum as Catalystud

摘要

Catalyst (NH4)6[-P2W18O62]/Ta has been synthesized by simple wet impregnation at 30-40 °C underudatmospheric conditions using Dawson type polyoxometalate (NH4)6[-P2W18O62] and tantalum. The catalyst wasudcharacterized by FTIR spectrophotometer, XRD, SEM, and N2 adsorption desorption methods. FTIR spectrum ofud(NH4)6[-P2W18O62]/Ta showed that Dawson type polyoxometalate (NH4)6[-P2W18O62] and Ta was successfullyudimpregnated which was indicated by vibration spectrum at wavenumber of 900-1100 cm-1 for polyoxometalate andud550 cm-1 for Ta. The surface area of the (NH4)6[-P2W18O62]/Ta after impregnation was higher than (NH4)6[-udP2W18O62]•nH2O and its morphology was found to be uniform. The catalytic activity of (NH4)6[-P2W18O62]/Ta towarduddesulfurization of dibenzothiophene was three times higher than the original catalyst of (NH4)6[-P2W18O62]•nH2Oudwithout impregnation. The catalytic regeneration test of catalyst (NH4)6[-P2W18O62]/Ta showed that the catalyticudactivity for first regeneration of catalyst has similar catalytic activity with the fresh catalyst without loss of catalyticudactivity indicated by almost similar percent conversion.udKeywords: dibenzothiophene; Dawson type; heteropoly; tantalum; desulfurization