n-Butane Isomerization on Peroxodisulfated Zirconia Solid Superacid Catalyst

The preparation of peroxodisulfated zirconia (PSZ) solid superacid catalyst is introduced. It proves more active than sulfated zirconia (SZ) for n-butane isomerization at ambient temperature, and among the non-halide anions having promotion action to ZrO2, S2O82- is the most effective. The optimum calcination tempera-ture is 600℃,which is 50℃ lower than that of SZ. The conversion of n-butane over PSZ s 50. 4% at 20 h at 35℃,and 36. 7% over SZ under the same condition- Since the △σ=0 of PSZ (600℃)is 52 cm-1, it can be conclud-ed that the higher activity of PSZ for n-butane isomerization is resulted from the stronger acid strength of PSZthan that of SZ.