Oscar Gumiriza - Academia.edu (original) (raw)
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Papers by Oscar Gumiriza
WLO, 2017
This research was conducted with the aims of producing alternative fuel at low price from Waste L... more This research was conducted with the aims of producing alternative fuel at low price from Waste Lubricating Oil [WLO] by solving the environmental problems that arise from its inadequate dumping. Calcium oxide (CaO) was used as a catalyst and it was obtained from three sources: cow bone ash, Banana Peels' ash and commercial CaO. Comparative study in catalysts strength which was conducted based on percentage yield of liquid hydrocarbon [HC] recovery and its quality as diesel-like fuel has proven commercial CaO and Bone Ash to be the best additives in pyrolytic reprocessing of WLO. On the other hand, banana peels' ash gave the highest percentage yield of liquid HC which was mainly consisted of oxidized HC as GC-MS, and IR analysis revealed. The average percentage yield for 2.5%w/v catalyst ratio was 81.36%, 88.06%, and 69.83% for commercial CaO, bone ash and banana peels' ash respectively. For the run of 5% catalyst ratio, the yield percentage was found to be 87.83%, 67.89% and 90.13% for commercial CaO, bone ash and banana peels' ash respectively. Kinematic viscosity and flash point of produced fuel was examined in this study as well as metal content of all ashes used as catalysts.
This study investigated the corrosion behaviour of mild steel immersed in 0.5 M organic acid med... more This study investigated the corrosion behaviour of mild steel immersed
in 0.5 M organic acid media and in 90 %/10 % 0.5 M organic acid media/
3.5 % NaCl by surface observation and weight loss technique. In all
the solutions (0.5 M organic acid and the organic acid containing 3.5
% NaCl), mild steel corroded more in acetic acid compared to other
solutions, while NaCl was lowest. The corrosion rate of mild steel
immersed in 90 % organic acid contaminated with 10 % of 3.5 %
NaCl was lower than that found when the steel samples were immersed
in 100 % organic acid. It can be suggested that there was lack of Cl−
ions which could break down passive films on the mild steel surface
to accelerate corrosion. Scanning electron microscope (SEM) was used
to examine and characterize the mild steel surface before and after its
immersion in the respective media. The elemental composition on
the corroded surface of mild steel was detected with the SEM coupled
with electron dispersive spectroscopy. The SEM and the physical
observation results showed corrosion products, which were confirmed
to be oxide films on the surface of the mild steel studied in 100 % organic
acid solutions. Meanwhile, the morphology of mild steel after corrosion
in organic acids containing NaCl showed that the corrosion products
were protective oxide films. The oxides of Fe, Mn, Na, and Si were
mostly detected on the surface of mild steel after corrosion.
WLO, 2017
This research was conducted with the aims of producing alternative fuel at low price from Waste L... more This research was conducted with the aims of producing alternative fuel at low price from Waste Lubricating Oil [WLO] by solving the environmental problems that arise from its inadequate dumping. Calcium oxide (CaO) was used as a catalyst and it was obtained from three sources: cow bone ash, Banana Peels' ash and commercial CaO. Comparative study in catalysts strength which was conducted based on percentage yield of liquid hydrocarbon [HC] recovery and its quality as diesel-like fuel has proven commercial CaO and Bone Ash to be the best additives in pyrolytic reprocessing of WLO. On the other hand, banana peels' ash gave the highest percentage yield of liquid HC which was mainly consisted of oxidized HC as GC-MS, and IR analysis revealed. The average percentage yield for 2.5%w/v catalyst ratio was 81.36%, 88.06%, and 69.83% for commercial CaO, bone ash and banana peels' ash respectively. For the run of 5% catalyst ratio, the yield percentage was found to be 87.83%, 67.89% and 90.13% for commercial CaO, bone ash and banana peels' ash respectively. Kinematic viscosity and flash point of produced fuel was examined in this study as well as metal content of all ashes used as catalysts.
This study investigated the corrosion behaviour of mild steel immersed in 0.5 M organic acid med... more This study investigated the corrosion behaviour of mild steel immersed
in 0.5 M organic acid media and in 90 %/10 % 0.5 M organic acid media/
3.5 % NaCl by surface observation and weight loss technique. In all
the solutions (0.5 M organic acid and the organic acid containing 3.5
% NaCl), mild steel corroded more in acetic acid compared to other
solutions, while NaCl was lowest. The corrosion rate of mild steel
immersed in 90 % organic acid contaminated with 10 % of 3.5 %
NaCl was lower than that found when the steel samples were immersed
in 100 % organic acid. It can be suggested that there was lack of Cl−
ions which could break down passive films on the mild steel surface
to accelerate corrosion. Scanning electron microscope (SEM) was used
to examine and characterize the mild steel surface before and after its
immersion in the respective media. The elemental composition on
the corroded surface of mild steel was detected with the SEM coupled
with electron dispersive spectroscopy. The SEM and the physical
observation results showed corrosion products, which were confirmed
to be oxide films on the surface of the mild steel studied in 100 % organic
acid solutions. Meanwhile, the morphology of mild steel after corrosion
in organic acids containing NaCl showed that the corrosion products
were protective oxide films. The oxides of Fe, Mn, Na, and Si were
mostly detected on the surface of mild steel after corrosion.