Date of Publication

7-27-2026

Document Type

Master's Thesis

Degree Name

Bachelor of Science in Chemical Engineering (Honors) - Ladderized

Subject Categories

Chemical Engineering

College

Gokongwei College of Engineering

Department/Unit

Chemical Engineering

Thesis Advisor

Angelo Earvin S. Choi
Nathaniel P. Dugos
Meng-Wei Wan

Defense Panel Chair

Rhoda B. Leron

Defense Panel Member

Raymond R. Tan
Michael Angelo P. Promentilla

Abstract (English)

The impacts of fossil fuel-derived oils show that there is an impending need to explore alternative fuels in industry. Pyrolysis oil from waste tires is a suitable replacement as it has similar fuel values to diesel. However, it contains high levels of sulfur which can corrode engines and poison catalysts in downstream processes. The combustion of these compounds also leads to a variety of negative health and environmental impacts. This study employed ultrasound-assisted oxidative desulfurization (UAOD) to remove dibenzothiophene (DBT) and benzothiophene (BT) from both model fuel and pyrolysis oil. Magnetic particles derived from dewatered wastewater sludge were used as a support for the phosphotungstic acid catalyst. This was successfully prepared and utilized to convert and remove DBT and BT from fuel. Optimization studies were also performed considering catalyst dosage, H2O2 concentration, temperature, and amplitude. The optimized UAOD parameters were 0.2829 g catalyst, 35 % H2O2 concentration, 50 °C, and 40 % amplitude for DBT with a conversion percent of 94.74 %. BT had 0.3356 g catalyst, 35 % H2O2 concentration, 40 °C, and 30 % amplitude as the optimal conditions with a percent conversion of 67.11 %. The optimal parameters were then applied to pyrolysis oil which resulted in a percent conversion of 41.81 %. The kinetics of the reaction were also analyzed which revealed that both reactions followed a pseudo-first order model. The activation energy and the rate constant for both reactions have improved compared to the use of an unmodified catalyst. Recyclability was also tested that resulted in 4 reuse cycles with modification. This confirmed the effectiveness of the catalyst under mild conditions.

Abstract Format

html

Abstract (Filipino)

Ang mga epekto ng paggamit ng krudo ay nagpapakita na may napipintong pangangailangan upang makadiskobre ng mga alternatibong langis sa industriya. Ang “pyrolysis oil” mula sa mga tinapon na gulong ay isang angkop na kapalit dahil ito ay may katulad na halaga ng gasolina. Gayunpaman, naglalaman ito ng mataas na antas ng sulfur na maaaring makasira sa mga makina at pumapatay ng mga katalista sa mga susunod na proseso. Ang pagkasunog ng elemento na ito ay humahantong din sa iba't ibang negatibong epekto sa kalusugan at kapaligiran. Gumamit ang pag-aaral na ito ng ultrasound-assisted oxidative desulfurization (UAOD) upang alisin ang dibenzothiophene (DBT) at benzothiophene (BT) mula sa modelong fuel at pyrolysis oil. Ang mga magnetic particle na nagmula sa dewatered wastewater sludge ay ginamit bilang suporta para sa phosphotungstic acid katalista. Matagumpay itong naihanda at nagamit upang maalis ang DBT at BT mula sa gasolina. Ang mga pag-aaral sa na gawin pinakamahusay ay isinagawa din na isinasaalang-alang ang dosis ng katalista, konsentrasyon ng H2O2, temperatura, at amplitude. Ang mga na-optimize na parameter ng UAOD ay 0.2829 g katalista, 35 % H2O2 konsentrasyon, 50 °C, at 40 % amplitude para sa DBT na may porsyentong conversion na 94.74 %. Ang BT ay may 0.3356 g katalista, 35 % H2O2 konsentrasyon, 40 °C, at 30 % amplitude bilang pinakamainam na kondisyon na may porsyentong conversion na 67.11 %. Ang pinakamainam na mga parameter ay inilapat sa pyrolysis oil na nagresulta sa isang porsyentong conversion na 41.81%. Ang kinetics ng reaksyon ay nasuri din na nagsiwalat na ang parehong mga reaksyon ay sumunod sa isang pseudo-first order model. Ang activation energy at ang rate constant para sa parehong mga reaksyon ay bumuti kumpara sa paggamit ng isang hindi binagong katalista. Nasubukan din ang recyclability na nagresulta sa 4 na reuse cycle. Kinumpirma nito ang pagiging epektibo ng katalista sa ilalim ng banayad na mga kondisyon.

Abstract Format

html

Language

English

Format

Electronic

Keywords

Desulfurization

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Embargo Period

7-27-2029

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Available for download on Friday, July 27, 2029

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