Designing polyoxometalate based hybrid catalysts for efficient removal of hazardous sulfur from fuel via heterogeneous oxidative desulfurization

Sadaf Ul Hassan, Sadaf Ahmad, Muhammad Asim Farid, Sohail Nadeem, Zulfiqar Ali, Rashid Abro, Aysha Mohyuddin, Muhammad Shahid Nazir, Murid Hussain, Young Kwon Park

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

Hydrodesulfurization is a common but less effective technique to remove sulfur content of oils due to severe operating conditions of temperature, pressure and cost. Oxidative desulfurization(ODS) is preferable due to low cost and mild operating conditions. Coupling of the extractive catalytic desulfurization with the ODS give rise to extractive catalytic oxidative desulfurization(ECODS), a more promising for the elimination of sulfur contents of fuel oil. Herein we present by polyoxometalate based hybrids, [H2TPP][K5BVW11O40]•2CH3CN•2H2O (1), [H2TPP]2[K3BVW11O40]•CH3CN•3H2O (2), and [H2TPP]3[KBVW11O40]•2CH3CN (3) for efficient ECODS of hazardous model fuel. These were synthesized by facile method and characterized by elemental analysis, inductive couple plasma, powder X-ray diffraction analysis, thermo-gravimetric/differential thermal analysis, fourier transform infrared, and UV–visible analysis. These polyoxometalate based hybrids contain cations [H2TPP]2+(organic) and [BVW11O40]7−(inorganic) with stoichiometric ratios(i.e., 1:1, 2:1, 3:1). The stoichiometry of these hybrids was also established by Job's analysis which agreed well with the results of TG-DTA and elemental analyses. Interestingly, an increase in catalytic efficiency is observed with increase of organic cations. The maximum ∼99.5 % conversion of dibenzothiophene at 60 °C after 2 h has been achieved with hybrid 3 which could be employed up to ten cycles without a significant decrease in efficiency.

Original languageEnglish
Pages (from-to)438-446
Number of pages9
JournalJournal of Industrial and Engineering Chemistry
Volume116
DOIs
StatePublished - 25 Dec 2022

Keywords

  • Heterogeneous catalysis
  • Model fuel
  • One-pot synthesis
  • Polyoxometalate based hybrids
  • Removal of sulfur

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