Synthesis of Tungstophosphates of Heteropoly Compound and Its Catalytic Property in Oxidative Desulfurization of Diesel

摘要

Several kinds of Tungstophosphates of Heteropoly Compounds (TPHC) with different compositions and the same structure were synthesized using the method of solid-phase reaction to change the mol ratio of Na4P2O7·10H2O, WO3 and Na2WO4·2H2O. TPHC, as a catalyst, was used in oxidative desul- furization of diesel. The results show that TPHC has catalytic activ- ity. With THPC existing, the highest desulfurization rate reaches 51.85%, 32.6% higher than that yield without TPHC. And the desulfurization rate increases with decreasing WO3. FT-IR spectra of TPHC shows that the catalytic activity is related to the activity of end oxygen(Od).The more active Od is, the stronger the capability of obtaining or losing electron is. It means that TPHC has a good cata- lytic activity. FT-IR spectra of TPHC indicates that desulfurization rate is in linear correlation with I W-O d /I P-Oa (I W-Odis intensity of W-Od vibration band, I P-Oais intensity of P-Oa vibration band) and correlation coefficient reaches 0.965.