Ultrasound and high-shear mixing-assisted oxidative desulfurization of fuel oils over activated carbon-supported phosphotungstic acid

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ID: 284930
2016
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Abstract
Sulfur content of the prominent crude oil is continually increasing. Sulfur in fuel contributes in the production of sulfur oxides and sulfate particulate matters which has serious effects in the environment and in health. A new method to either assist or replace the existing technology in sulfur removal is gaining significant attention in the research field – Ultrasound Assisted Oxidative Desulfurization (UAOD) and High-Shear Mixing Assisted Oxidative Desulfurization (MOAD) because of its advantages such as the mild operating conditions, non-usage of the expensive hydrogen gas, and better oxidation of the refractory organic sulfur compounds. In this study, it was found that the utilization of ultrasound and high-shear mixing as assistance to oxidative desulfurization was successful and the reactivities of the three compounds are as follows: DBT > BT > T, owing to their electron densities. The most suitable loading of phosphotungstic acid (HPW) on activated carbon (AC) was 10%. The UAOD applied to model fuel was optimized at 9.88 M, 281.56 mg of catalyst, 145.49 mg of PTA, 26.6 mL to 13.4 mL of OP:AP ratio and 18.36 minutes of ultrasonication rendering an oxidation of more than 99% of the 500 ppm sulfur in the form of dibenzothiophene. UAOD and MAOD was applied to simulated fuel – 2800 ppm sulfur in the form of the three sulfur compounds. The UAOD applied to simulated fuel is optimized at 25.52wt% of H2O2, 983.9 mg of catalyst dose, 9.52 mL of AP per 10 mL of OP and 76.6 minutes of ultrasonication rendering a percent oxidation of 94.74%. MAOD applied to simulated fuel is optimized at high levels of parameters: 50°C reaction temperature, and 90 minutes of reaction time rendering 97.52% oxidation. After applying to an actual fuel – kerosene, the desulfurization efficiencies were more than 98%. The basic properties of the fuel produced after desulfurization is near its original value and thus, the desulfurized fuels are viable for use.
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Authors Gildo, Peniel Jean Alvarado
Journal Malay Journal
Year 2016
DOI
DOI not found
URL
https://animorepository.dlsu.edu.ph/etd_masteral/7292
Keywords Keywords not found

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