Esterification of oleic acid over solid acid catalysts prepared from Amazon flint kaolin

▶ The best catalyst (MF9S4) was prepared at 950 °C, using after H2SO4 4 M. ▶ MF9S4 presented the higher values of acidity and surface area. ▶ MF9S4 reached 98.9% of conversion of oleic acid at 160 °C. ▶ Esterification of oil palm/oleic acid mixture reached 84.8% of conversion over MF9S4. ▶ MF9S4 is a new eco-friendly catalyst for the esterification.