Polymolybdate Supported Nano Catalyst for Desulfurization of Diesel

Polymolybdate Supported Nano Catalyst for Desulfurization of Diesel

Wan Azelee Wan Abu Bakar, Wan Nazwanie Wan Abdullah, Rusmidah Ali, Wan Nur Aini Wan Mokhtar
DOI: 10.4018/978-1-4666-9545-0.ch009
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The Catalytic oxidative desulfurization (Cat-ODS) comprises of molybdenum based catalyst, tert-butyl hydroperoxide (TBHP) as oxidant and dimethylformamide (DMF) as solvent for extraction. A series of polymolybdates supported alumina were prepared using the wet impregnation method. This potential catalyst was characterized by FTIR, FESEM-EDX and XPS for its physical properties. From catalytic testing, Fe/MoO3-Al2O3 calcined at 500°C was revealed as the most potential catalyst which gave the highest sulfur removal under mild condition .The sulfur content in commercial diesel was successfully reduced from 440 ppmw to 88 ppmw under mild condition followed by solvent extraction. Response surface methodology involving Box-Behnken was employed to evaluate and optimize Fe/MoO3/Al2O3 preparation parameters (calcination temperature, catalyst loading, and Fe loading) and their optimum values were found to be 550 ºC, 10 g/L, and 10%. of calcination temperature, catalyst loading, and Fe loading. Based on these results, the reaction mechanisms of peroxy oxygen were proposed.
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All solvents and chemicals were used without further purification. Phosphomolybdic acid hydrate and tert-butyl hydroperoxide (aqueous, 70wt%) were obtained from Across Organic. Iron(III) nitrate nonahydrate (99%), copper(II) nitrate trihydrate (99.5%) and cobalt(II) nitrate hexahydrate (99%) were obtained from QRëc. λ-Al2O3 beads (3-5 mm diameter) was obtained from Sigma-Aldrich, and dimethylformamide (DMF) was purchased from MERCK. Commercial diesel fuel (440 ppm sulfur) was obtained from Petronas, Malaysia.

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