SO4-ZrO2 catalysts, prepared by varying the conditions of oxide preparation
and H2SO4 impregnation, have been characterized by means of different tech
niques (XRD, BET, Hammett-Bertolacini technique, XPS). The esterification o
f benzoic acid to methylbenzoate has been used to test the different cataly
sts and their catalytic performance has been discussed in the light of thei
r bulk and surface properties.