A series of new superacid catalysts the H-mordenite (HM) supported SO~4^2^-/ZrO~2 (SZ) were prepared successfully. The variation roles of their surface area, pore volume and sulfur contents as well as superacidity were investigated in detail. It was found that, the superacidity of HM was greatly enhanced after introducing SZ on its surface, so that it could catalyze n-butane isomerization even at 35℃ . The IR spectrum of the adsorbed pyridine shows that both the amount of Lewis acid and the total acid on some of the SZ/HM samples were improved comparing to pure HM when their contents of zirconia were proper. As a result, their catalytic activities for some acid catalyzed reactions, such as toluene disproportionation and oxylene isomerization, were increased remarkably. The result of XRD confirmed that the construction of mordenite kept well when the content of SZ was proper. However, high amount of SZ (> 60%, mass fraction) could result damage of the construction of HM.

Key words: MORDENITE, SULFURIC ACID, ZIRCONIUM OXIDE, SUPERACID, X-RAY DIFFRACTION ANALYSIS, METHYLBENZENE, DIMETHYLBENZENE