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以纳米二氧化硅(SiO_2)为载体,采用浸渍法制得SiO_2固体酸微球。探讨不同反应条件对SiO_2微球的影响,研究磺化温度和时间对SiO_2固体酸微球酸量和酯化率的影响,并采用傅里叶红外光谱(FT-IR)、X射线衍射(XRD)对SiO_2微球、SiO_2固体酸微球进行表征。结果表明:在磺化时间为4h、磺化温度为220℃、SiO_2微球与浓硫酸按1∶10固液配合比(质量比)的条件下,制得的SiO_2固体酸微球的粒径为180nm,总酸量达到4.53mmol/g,对乙酸和乙醇酯化反应的催化效率达到80.75%。
Nanosilica (SiO 2) was used as support to prepare SiO 2 solid acid microspheres by impregnation method. The effect of different reaction conditions on the microspheres of SiO 2 was investigated. The effects of sulfonation temperature and time on the acidity and esterification of SiO 2 solid acid microspheres were studied. The effects of FT-IR, XRD, ) On the microspheres of SiO2, SiO2 solid acid microspheres were characterized. The results showed that the particle size of SiO_2 solid acid microspheres prepared under the conditions of the sulfonation time of 4h, the sulfonation temperature of 220 ℃, the ratio of SiO 2 microspheres to the concentrated sulfuric acid at the mass ratio of 1:10 Of 180nm, the total acid amount reached 4.53mmol / g, the catalytic efficiency of esterification of acetic acid and ethanol reached 80.75%.