Synthesis of tungstophosphates of heteropoly compound and its catalytic property in oxidative desulfurization of diesel

Abstract

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 Na 4 P 2 O 7 10H 2 O, WO 3 and Na 2 WO 4 2H 2 O. TPHC, as a catalyst, was used in oxidative desulfurization of diesel. The results show that TPHC has catalytic activity. 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 WO 3 . FT-IR spectra of TPHC shows that the catalytic activity is related to the activity of end oxygen(O d ).The more active O d is, the stronger the capability of obtaining or losing electron is. It means that TPHC has a good catalytic activity. FT-IR spectra of TPHC indicates that desulfurization rate is in linear correlation with d a W-O P-O I is intensity of P-O a vibration band) and correlation coefficient reaches 0.965.