چكيده به لاتين
Abstract:
In this work, oxidative desulfurization of resistant compounds thiophene has been studied using the supported polyoxometalate catalytic with Dawson structure and air as oxidant. For this purpose, the supported polyoxometalate catalytic with Dawson structure, was made of titanium-based catalysts with four different loading (loads 15, 20, 25 and 30%). The structure of this catalyst was analyzed by FTIR- UV-vis and XRD experiments. Using the Taguchi design, reactor experiments conducted early and catalyst H9P2W15V3O62/TiO2-15% was introduced as the optimal catalyst and the operation condition was determined as optimized. The optimal condition (Temperature 130°C, inlet airflow to reactor 160ml/min and catalyst amount 10. gr/lit) has been determined. Also in this work, 7 experiments were conducted to obtain the equilibrium time which, after 150 minutes the reaction achieved stability in system and by conducting 8 experiments the best inlet airflow to reactor is 160ml/min. In optimal operational condition the catalyst can eliminate 78.4% of dibenzothiophene. Furthermore, no auxiliary solvent such as acetonitrile has been used in reactions. After conducting the experiment in present of acetonitrile with ratio of 1:2 in model oil (Sulfur concertation: 500 PPMw), elimination of sulfur was achieved by 97.3%. With increasing the sulfur concentration to 1000 PPMw the sulfur elimination was decreased to 56.85%. The number of catalyst recovery stages for model oil and real oil has been studied and the results show that the catalyst activity and its effectiveness id still acceptable after 4 stages of recovery.
Keywords:
Compounds thiophene – polyoxometalate - oxidative desulfurization – Air- titania
