Biodiesel Synthesis From Crude Jatropha Oil Using An ActiveHeterogeneous Nano Catalyst: An Optimized Process
2015
Heterogeneous catalysts are often used at large to produce biodiesel from non-edible crude oils
such as crude Jatropha oil (CJO) due to their numerous advantageous over homogeneous
catalysts. In this study, an active heterogeneous calcium oxide (CaO) nano-catalyst was
synthesized from waste egg shells and catalytic efficiency of CaO was investigated in a twostep
transesterification of CJO triglycerides as biodiesel. The CaO nano-catalyst was
synthesized using a hydro-thermal technique. Fourier transform infrared (FT-IR) spectroscopy,
Brunauer-Emmett-Teller (BET), Scanning electron microscopy (SEM) and X-ray diffraction
(XRD) techniques were employed to evaluate the catalyst structural characteristics.
Transesterification reaction kinetics and their impact on biodiesel were analyzed by utilizing a
response surface model based on central composite design. The primary reaction parameters
such as catalyst concentration and the reaction time were considered for the two-factor-fivelevel,
full factorial model. The remaining parameters that include, methanol to oil ratio, stirring
RPM and reaction temperature were treated as constants. The sufficiency of the predicted model
was conformed through experiments, and a 96.47% biodiesel was noted at 0.02:1 (w/w) catalyst
concentration and 128 min reaction time. An average of 93.2% biodiesel yield was recorded
from the CaO catalyst recycling studies up to 5th reuse cycle.
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