Abstract
By using nanometer oxides as precursor , solid superacid catalyst SO2 -4 /ZrO2 with Hammett constant less than -12 .14 was prepared .The catalyst SO2 -4 /ZrO2 was used for the ace talization of benzaldehyde with acetic anhydride .The results of IR, GC ,NMR and melting point measurement show that the purity o f the target product of acetalization is very high .The influence of calcining temperature , concentration of sulphuric acid, immersing time and activating temperature on the yield of aldehy deacetal was investigated by uniform design.The optimum conditions for obtaining the highest yield of aldehyde acetal are as follows :the calcining temperature is 300 ℃, concentration of sulphuric acid in immersion liquid is 4 .5mol/ L, immersing time is 1 hour , activating temperature is 305 ℃.The yield of aldehy deacetal is 93.6 %.The analysis of IR and TG indicates that the absorptive capacity of SO2 -4 on SO2 -4 /ZrO2 is large .The reusing experiment of catalyst show s that the catalyst can be reused more than ten times with high catalytic activity .Its treatment and regeneration are easy .
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