phosphotungstic acid on different natural zeolites as nanocatalyst of dibenzothiophene oxidative desulfurization

desulfurization which produces green fuels and also increases the lifetime of combustion engines is a very crucial process for environmental purposes. based on the new environmental regulations, the sulfur content of diesel fuel must be less than 10 ppm. ultra-deep oxidative desulfurization in mild operating conditions is a supplement (temperature less than 100°c and atmospheric pressure) to remove aromatic sulfur compounds compare to hydrodesulfurization. in oxidative desulfurization, the sulfur compounds are oxidized with an oxidizing agent and a suitable catalyst and a polar solvent are used for extraction of produced sulfones and sulfoxides. in this research, phosphotungstic acid was impregnated on natural zeolites of clinoptilolite, mordenite, ferrierite, and natrolite. nano the nanocatalyst of phosphotungstic acid on ferrierite with the conversion of 82.02% had the best performance in dibenzothiophene removal compared to other synthesized catalysts. using ferrierite as the support, the amount of phosphotungstic acid has been changed from 0 to 40 %wt and it was concluded that 20%wt. of phosphotungstic acid had the best desulfurization with the conversion of 91.12%. the synthesized nano catalysts were characterized by bet, xrd, and ftir as well.