| 肖强.Co/Al2O3催化剂上3-甲基-2-丁烯醛选择性加氢反应[J].分子催化,2012,(4):308-313 |
| Co/Al2O3催化剂上3-甲基-2-丁烯醛选择性加氢反应 |
| Selective Hydrogenation of 3-Methylcrotonaldehyde over Co/Al2O3 Catalysts |
| 投稿时间：2012-06-19 修订日期：2012-07-25 |
| DOI： |
| 中文关键词: Co/Al2O3 3-甲基-2-丁烯醛 选择性加氢 磁性催化剂 |
| 英文关键词:Co/Al2O3 3-methylcrotonaldehyde selective hydrogenation magnetic catalyst |
| 基金项目:浙江省高校重大科技攻关项目 |
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| 中文摘要: |
| 3-甲基-2-丁烯醛（3-MeCal）是一种典型的α, β-不饱和醛，其C=O加氢产物3-甲基-2-丁烯醇（3-MeCol）作为重要的有机中间体，在医药、香料、农药等生产领域有着广泛的应用。本文采用沉积沉淀法制备了Co/Al2O3催化剂，将其应用于3-MeCal液相选择性加氢反应中，考察了反应温度、H2初始压力、催化剂焙烧温度和还原温度对3-MeCal选择性加氢反应的影响。发现反应温度为80 ℃，H2初始压力为1?06 Pa下，催化剂具有较佳的催化性能，H2-TPR表征了焙烧温度对催化剂的影响，发现升高焙烧温度能增强Co物种与载体Al2O3间作用力。焙烧温度为600 ℃，还原温度为550 ℃下制备的催化剂反应48 min后转化率为23.0 %，3-MeCol选择性达到88.6 %。制备的Co/Al2O3催化剂具有良好的磁性，在外磁场作用下可与液相反应体系实现高效分离，循环使用3次后，催化性能没有明显下降，表现出良好的循环使用性能。 |
| 英文摘要: |
| 3-Methylcrotonaldehyde (3-MeCal) is one of typical α,β-unsaturated aldehydes. The hydrogenated product 3-methylcrotonalcohol (3-MeCol) of the C=O has a wide application in the production of perfumes, pharmaceuticals, and pesticides etc., as an important organic intermediate. In this contribution, Co/Al2O3 catalysts were prepared by a deposition-precipitation method and were used in the liquid-phase selective hydrogenation of 3-MeCal to 3-MeCol. The effect of the reaction temperature, the H2 initial pressure, and the calcination and reduction temperature of the catalysts were investigated. The results indicated that the catalyst displayed a good performance at the reaction temperature of 80 ℃ and a H2 initial pressure of 1?06 Pa. The H2-TPR technique was employed to investigate the effect of calcination temperature on the catalysts, indicating that an increase in calcination temperature could enhance the interactions between cobalt species and alumina support. The optimized catalyst prepared with calcination at 600 ℃ and followed by reduction at 550 ℃ exhibited an excellent performance. After 48 minutes, the conversion of 3-MeCal could reach 23.0 % with the selectivity for 3-MeCol of 88.6 %. Additionally, the prepared Co/Al2O3 catalysts exhibited excellent magnetic properties. Under a magnetic field, the catalyst powder could be easily separated from the liquid-phase reaction system. The catalysts did not show any significant degradation in the hydrogenation of 3-MeCal after three-cycle reuse, indicating the good recyclability of the prepared Co/Al2O3 catalysts. |
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