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Rare-earth compound solid superacid SO42-/TiO2/La3+ was prepared. Its catalytic activity was examined under different synthetic conditions for the esterification of propanoic acid and n-butyl alcohol as probing reaction. The optimum conditions were also found, which were the pH=8, the depositing time was 24 h, the mass fraction of La(NO3)3 used in solid superacid was 5%, the concentration of H2SO4 was 1.25 mol/L, the soaking time in H2SO4 was 16 h and the calcining temperature was 500 °C. The ethyl oleate was synthesized from oleic acid and ethanol in the presence of SO42-/TiO2/La3+. The optimum reaction conditions were obtained which were the reaction time was 6 h, molar ratio of oleic acid to ethanol was 1:4 and the mass fraction of catalyst was 4%.
Rare-earth compound solid superacid SO42- / TiO2 / La3 + was prepared. Its catalytic activity was examined under different synthetic conditions for the esterification of propanoic acid and n-butyl alcohol as probing reaction. = 8, the depositing time was 24 h, the mass fraction of La (NO3) 3 used in solid superacid was 5%, the concentration of H2SO4 was 1.25 mol / L, the soaking time in H2SO4 was 16 h and the calcining temperature was 500 ° C. The ethyl oleate was synthesized from oleic acid and ethanol in the presence of SO42- / TiO2 / La3 +. The optimum reaction conditions were obtained which were the reaction time was 6 h, molar ratio of oleic acid to ethanol was 1: 4 and the mass fraction of catalyst was 4%.