Transesterification of canola oil over Li/Ca-La mixed oxide catalyst: Kinetics and calcination temperature investigations
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Abstract: In this research, a solid 1%Li/Ca-La mixed oxide catalyst was prepared using co-precipitation method followed by wet impregnation. The prepared catalyst was used in the transesterification reaction of canola oil and methanol for biodiesel synthesis. The effects of calcination and reaction temperatures were investigated on the activity of the catalyst. In addition, rate of the reaction was studied through a kinetic model for which parameters were determined. Surface properties and structure of the catalyst were characterized through the powder X-ray diffraction (XRD), thermogravimetry/derivative thermogravimetry (TG/DTG), and Fourier transform infrared spectroscopy analysis. All these emphasized that the performance of the catalyst corresponded to the generation of the active sites and their thermal activation.
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Key words:
- biodiesel /
- heterogeneous catalyst /
- calcination temperature /
- kinetic study
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Figure 1 XRD patterns of 1%Li/Ca-La mixed oxide catalyst at different calcination temperatures
Figure 4 Effect of calcination temperature on the activity of 1%Li/Ca-La catalyst for the transesterification reaction of canola oil to FAMEs
reaction conditions: catalyst amount = 5%; methanol/oil (molar ratio) = 15:1; temperature = 65 ℃ and reaction duration = 2.5 h
Figure 5 Effect of reaction temperature on the catalytic activity of 1%Li/Ca-La catalyst for the transesterification reaction of canola oil to FAMEs
reaction conditions: catalyst amount=5%; methanol/oil (molar ratio)=15:1; calcination temperature=700 ℃
Figure 6 Graph of-ln (1-y) vs. the reaction time at different reaction temperatures
reaction conditions: catalyst amount = 5%; methanol/oil (molar ratio)= 15:1; calcination temperature= 700 ℃
Table 1 Chemical and physical properties of canola oil
Property Value Oleic acid /% 59 Linoleic acid /% 22 Linolenic acid /% 9 Palmitic acid /% 5 Stearic acid /% 3 Erucic acid /% 2 Saponification value /(mgKOH·g-1) 187 Acid value /(mgKOH·g-1) 0.071 Water content /% 0.98 
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