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通过水预处理方法对比研究了不同焙烧温度制备的SO_4~(2-)/TiO_2固体超强酸的抗水稳定性,借助XRD、NH_3-TPD、FT-IR、TG和BET等表征技术分析材料的结构特征。结果表明,当焙烧温度在500℃以下时,所制得的SO_4~(2-)/TiO_2固体超强酸具有相近的优异酯化性能;当焙烧温度提升至600℃以上时,SO_4~(2-)/TiO_2的孔结构坍塌,SO_4~(2-)含量下降,酯化性能显著下降。经过水预处理后,所有固体超强酸酯化活性降低,主要与其SO_4~(2-)脱落和酸量明显减小有关。相比之下,400℃制备的SO_4~(2-)/TiO_2固体超强酸催化剂具有较好的稳定性。
The water stability of SO_4 ~ (2 -) / TiO_2 solid superacid prepared by different calcination temperatures was studied by water pretreatment method. The effects of different sintering temperature on the stability of SO_4 ~ (2 -) / TiO_2 solid superacid were compared by XRD, NH_3-TPD, FT-IR, TG and BET Structure. The results show that the SO_4 ~ (2 -) / TiO_2 solid superacid has similar excellent esterification performance when the calcination temperature is below 500 ℃. When the calcination temperature is above 600 ℃, the SO_4 ~ (2- ) / TiO 2 collapsed, the content of SO 4 2- decreased and the esterification property decreased significantly. After water pretreatment, all the solid superacid esterification activity decreased, mainly with its SO 4 ~ (2) shedding and acid content was significantly reduced. In contrast, SO 4 2- / TiO 2 solid superacid catalyst prepared at 400 ℃ has good stability.