In order to conveniently and rapidly evaluate the stability of the sulfated solid superacid against the water

the TiO2-supported and the ZrO2-supported solid superacid were used as the objects to study the influence of support and preparation process on the stability of solid superacid under different temperature water pretreatment. The physical structure of solid superacid was characterized by means of XRD and BET. It was found that there were no significant changes in crystallite and pore structure of the solid superacid with water pretreatment. FTIR and NH3-TPD results showed that the catalytic activity of all the solid superacid decreased a lot after water pretreatment. When the temperature of water pretreatment was rising

the amount of SO42- further dropped so that the acid amount fell and the catalytic activity of solid superacid decreased significantly. Moreover

the present work showed that the stability of ZrO2-supported sulfated solid superacid was better than that of TiO2-supported sulfated solid superacid but the initial activity was worse than the TiO2-supported superacid. In addition

the loss of SO42- of solid superacid prepared by calcination before SO42- acidification was less than that by SO42- acidification before calcination

which indicated that the preparation process had influence on the stability of solid superacid.