Transesterification of canola oil to biodiesel using calcium bentonite functionalized with K compounds

The transesterification reaction of canola oil and methanol to biodiesel was investigated using a calcium bentonite based catalyst support that was functionalized with KF, KOH and K2CO3. Transesterification reaction time, methanol to oil molar ratio, temperature and catalyst loading level were the principal parameters. The activity of KF impregnated catalyst was superior to those of KOH and K2CO3 catalysts. Methyl ester yields which were as high as 98.2 ± 1.4% could be obtained with KF impregnation.

.Figure optionsDownload as PowerPoint slideHighlights
► Highly active solid base catalysts were synthesized by using calcium bentonite as a convenient support material and employed for transesterification.
► A relatively high 98.2 ± 1.4% methyl ester yield could be obtained by using 40% KF on calcium bentonite catalyst.
► The catalyst was recovered and tested for reusability and stability.
► Bentonite was found to be a suitable support material for the preparation of K-functionalized biodiesel catalysts for the canola oil transesterification reaction.