The effect of the electrophilic anion coordination on the surface of four zirconium and one iron oxides with respect to the solid acid strength and the coagulation of constituent primary particles were examined. The anions Cl-, SO2-4, and PO3-4 enhanced the acid strength of these oxides by coordination, and brought about catalytic activity for esterification and isomerization of n-butane, c-hexane and 1-butene.
It was found that these anions other than Cl-1 acted as a suppressor to the coagulation and joining of the primary particles, as well as a retarding agent of crystal phase transition in the coordinated oxides.
