Authors :
Rokhsana Mohammed Ismail; Amal Mohammed Ahmed
Volume/Issue :
2nd ICTSA-2022
Google Scholar :
https://bit.ly/3TmGbDi
Scribd :
https://bit.ly/3lPA3aB
DOI :
https://doi.org/10.5281/zenodo.7788640
Abstract :
In this paper, heterogeneous catalysts based
on natural dolomite mineral in the transestrification of
Jatropha oil into biodiesel. Investigating the applicability
of natural basic carbonate minerals as potential catalysts
in biodiesel production from Yemeni Jatropha oil. The
effect of thermal treatment of these minerals had been
addressed and correlating the catalytic behavior with the
surface properties of these systems was attempted. XRD
measurements show that the dolomite mineral is highly
crystalline with small amounts of calcite. Increasing the
temperature of thermal treatment up to 500oC has no
significant effect on the X-ray diffraction patterns, but
upon further increase of the temperature to 600oC the
dolomite phase was found to decompose due to the
decarbonisation of MgCO3. Temperatures as high as
800oC were found to be necessary to start the thermal
decomposition of calcium carbonate, but appreciable
amounts of calcite remain even after several hours of
thermal treatment at 800oC. The transestrification of
Jatropha oil was conducted at 60oC with a methanol-tooil molar ratio of 6:1. Dolomite samples thermally
treated up to a temperature of 700oC showed only low
activities in the transestrification of Jatropha oil
(conversion~20%). Raising the temperature of thermal
treatment to 800oC increased the activity significantly to
95%-conversion, apparently due to the formation of
strongly basic CaO. It was found that heating the
mineral for at least 30 minutes at 800oC is necessary to
produce a highly active system. The optimum catalyst-tooil mass ratio was determined to be 1:50.
Keywords :
Dolomite, Transestrification, Biodiesel, Thermal Treatment, Heterogeneous, Catalysts.
In this paper, heterogeneous catalysts based
on natural dolomite mineral in the transestrification of
Jatropha oil into biodiesel. Investigating the applicability
of natural basic carbonate minerals as potential catalysts
in biodiesel production from Yemeni Jatropha oil. The
effect of thermal treatment of these minerals had been
addressed and correlating the catalytic behavior with the
surface properties of these systems was attempted. XRD
measurements show that the dolomite mineral is highly
crystalline with small amounts of calcite. Increasing the
temperature of thermal treatment up to 500oC has no
significant effect on the X-ray diffraction patterns, but
upon further increase of the temperature to 600oC the
dolomite phase was found to decompose due to the
decarbonisation of MgCO3. Temperatures as high as
800oC were found to be necessary to start the thermal
decomposition of calcium carbonate, but appreciable
amounts of calcite remain even after several hours of
thermal treatment at 800oC. The transestrification of
Jatropha oil was conducted at 60oC with a methanol-tooil molar ratio of 6:1. Dolomite samples thermally
treated up to a temperature of 700oC showed only low
activities in the transestrification of Jatropha oil
(conversion~20%). Raising the temperature of thermal
treatment to 800oC increased the activity significantly to
95%-conversion, apparently due to the formation of
strongly basic CaO. It was found that heating the
mineral for at least 30 minutes at 800oC is necessary to
produce a highly active system. The optimum catalyst-tooil mass ratio was determined to be 1:50.
Keywords :
Dolomite, Transestrification, Biodiesel, Thermal Treatment, Heterogeneous, Catalysts.