The catalytic performance of the PCxS-SO3H catalyst for the acetic
and oleic acid esterification with ethanol was evaluated at 75 °C for
10 h. Fig. 3a and b show the evolution of acetic acid conversion versus
reaction timefor the different PCx-SO3H catalysts (heterogeneous particle
size distribution, Fig. 3a and for PCxS-SO3H catalysts (particle size in
the range of 0.210 to 0.40mm, Fig. 3b. Esterificationwas also carried out
with commercial catalysts: Nafion® 117 and Amberlite-IR 120