Biodiesel (methyl oleate) synthesis in the presence of pyridinium and aminotriazolium acidic ionic liquids: Kinetic, thermodynamic studies

•Biodiesel synthesis using pyridinium and aminotrizolium ionic liquids is studied.•Catalytic activity (ATN < PN < PHS) depends on the acidic scale (Hammett function).•10 wt% PHS, of 55 °C and M = 7.0 are optimal conditions for biodiesel synthesis.•Biodiesel yield passes through a maximum at reactants molar ratio within 7.0–10.0.•The thermodynamic parameters ΔHr°,ΔSr°, ΔGr°, ΔH≠, ΔS≠ and ΔG≠ are determined.