Then we have drawn a conclusion: the maximal acid strength of SO_4~(2-)/TiO_2-SiO_2 solid superacid catalyst is -12.70. The acid centre mode of SO_4~(2-)/TiO_2-SiO_2 is chelate structure.

• 结果表明:SO_4~(2-)/ZiO_2-SiO_2催化剂的酸强度最大达-12.；70。 SO_4~(2-)/TiO_2-SiO_2固体超强酸的酸中心模型是螫合式双配位。