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采用溶胶-凝胶法制备SO24-/TiO2-SnO2固体超强酸,以乙酸与正丁醇的酯化反应为探针反应,考察钛锡摩尔比、硫酸浓度、焙烧温度对固体超强酸催化性能的影响,并采用IR,XRD,TG-DTA等手段对催化剂进行表征。结果表明,在钛锡摩尔比为3:1、H2SO4浸渍液浓度为2.0mol/L、焙烧温度为500℃的条件下制备的SO24-/TiO2-SnO2催化剂活性较好;SO24-/TiO2-SnO2中SnO2的存在明显抑制了TiO2晶粒的生长,使粒度细化;SnO2的引入提高了SO42-/TiO2-SnO2催化剂的稳定性。
The solid superacid SO24- / TiO2-SnO2 was prepared by sol-gel method. The esterification reaction between acetic acid and n-butanol was used as the probe reaction. The effects of molar ratio of titanium to tin, concentration of sulfuric acid and calcination temperature on the catalytic performance of solid superacid The catalysts were characterized by IR, XRD and TG-DTA. The results show that the SO24- / TiO2-SnO2 catalyst prepared under the conditions of a molar ratio of titanium to tin of 3: 1, a H2SO4 impregnation concentration of 2.0mol / L and a calcination temperature of 500 ℃ is good. SO24- / TiO2-SnO2 The presence of SnO2 significantly inhibits the growth of TiO2 grains and makes the grain refinement. The introduction of SnO2 improves the stability of SO42- / TiO2-SnO2 catalyst.