Effect of calcium and iron over MoO3-PO4/Al2O3 catalyst in oxidative desulfurization of Malaysian diesel

Authors

  • Wan Nazwanie Wan Abdullah
  • Rusmidah Ali
  • Wan Azelee Wan Abu Bakar

DOI:

https://doi.org/10.11113/mjcat.v2n1.21

Keywords:

catalyst, catalytic oxidative desulfurization, commercial diesel, tert-butyl hydroperoxide

Abstract

The catalytic oxidative desulfurization (Cat-ODS) process has emerged as a new technology to achieve ultra-low sulfur levels in diesel fuels. The effect of calcium and iron dopant in MoO3-PO4/Al2O3 catalyst were tested on desulfurization reaction at ambient condition. The oxidizing reagent used wastert-butyl hydroperoxide (TBHP) and dimethylformamide (DMF) acted as an extraction solvent. A commercial Petronas diesel with 440 ppmw of total sulfur was employed to evaluate the elimination of sulfur compounds. The result obtained revealed that Fe/MoO3-PO4/Al2O3 catalyst gave superior performance towards desulfurization. The Fe/MoO3-PO4 catalyst was able to reduce the sulfur in commercial diesel from 440 to 79 ppmw with 82%  of total sulfur removal while  Ca/MoO3-PO4/Al2O3 catalyst only achieved 76% of sulfur removal. Ammonia temperature programme desorption (TPD) analyses showed that the Fe/MoO3-PO4/Al2O3 catalyst was strong Lewis acid while field emission scanning electron microscopy (FESEM) micrograph illustrated an aggregation and agglomeration of various particle sizes. The mechanistic study showed that it was depended on the type of dopant as the Fe/MoO3-PO4/Al2O3 catalyst tended to form sulfone in the oxidative desulfurization reaction meanwhile, the sulfoxide formation was dominated in the oxidative desulfurization reaction using Ca/MoO3-PO4(10:90)/ Al2O3 catalyst. The results obtained showed that Fe/MoO3-PO4(10:90)/Al2O3 catalyst can be used as a potential catalyst for the removal of sulfur in Malaysian diesel to achieve Euro IV  diesel.

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Published

2017-02-24

How to Cite

Wan Abdullah, W. N., Ali, R., & Wan Abu Bakar, W. A. (2017). Effect of calcium and iron over MoO3-PO4/Al2O3 catalyst in oxidative desulfurization of Malaysian diesel. Malaysian Journal of Catalysis, 2(1). https://doi.org/10.11113/mjcat.v2n1.21

Issue

Vol. 2 No. 1 (2017)

Section

Research Article

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