| 纳米固体超强酸SO42-/Fe2O3的制备及其催化合成乙酸乙酯 |
| Study on Preparation of Nano Solid Superacid SO42-/Fe2O3 used as a Catalyst to Synthesize Acetic Ether |
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| 摘要: 将Fe2O3纳米粉体经一定浓度的H2SO4浸泡活化后制成纳米固体超强酸SO42-/Fe2O3,将其用于催化合成乙酸乙酯以考察其活性。利用均匀设计分析了超强酸制备过程及酯化反应过程中各因素的影响,研究结果表明较好的制备条件是:H2SO4浓度:2.5mol·L-1;浸泡时间:1h;活化温度:167℃;活化时间:1h,此时获得的固体超强酸SO42-/Fe2O3的粒径小于50nm。当催化剂用量为冰乙酸质量的5%,n(乙醇)∶n(冰乙酸)为3∶1,反应3.5h后乙酸的转化率高于80%。该催化剂经H2SO4溶液浸泡、活化再生后可重新使用,推断出其酸强度H0<-14.5。 |
| 关键词: 制备 纳米SO42-/Fe2O3 催化合成 乙酸乙酯 |
| 基金项目: |
| Abstract: Nano solid superacid SO42-/Fe2O3 has been prepared by immersing nano Fe2O3 powder into sulphuric acid and activating it. Its activity has been examined by acting as a catalyst to synthesize acetic ether. The effects of varied factors in superacid preparation and esterification have been analyzed by uniform design. The results of test indicate that the better reaction conditions are:CH2SO4: 2.5mol·L-1; immersing time: 1h; calcining temperature: 167℃ and calcining time: 1h ; The size of nano solid superacid SO42-/Fe2O3 attained under these conditions is less than 50nm. When the amount of catalyst is 5%(based on mass of acetic acid) and the molar ratio of ethanol to acetic acid is 3∶1, the conversion of acetic acid was over 80% after 3.5hours. This catalyst can be regenerated by being immersed into sulphuric acid and activated. Its acidity(H0) was deduced to be smaller than -14.5. |
| Keywords: preparation nano SO42-/Fe2O3 catalytic synthesis acetic ether |
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| 王绍艳,张志强,吕玉珍,侯鑫.纳米固体超强酸SO42-/Fe2O3的制备及其催化合成乙酸乙酯[J].无机化学学报,2002,18(3):279-283. |
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