| 张学勤,李强,肖美添,叶静.浸渍溶剂对Pt/炭-氧化铝催化氢化2-氧-4-苯基丁酸乙酯的影响[J].分子催化,2014,(3):234-241 |
| 浸渍溶剂对Pt/炭-氧化铝催化氢化2-氧-4-苯基丁酸乙酯的影响 |
| Effects of Impregnation Solvents on Asymmetric Hydrogenation of Ethyl 2-Oxo-4-Phenylbutyrate on Pt/Alumina-Carbon Catalysts |
| 投稿时间：2014-01-27 修订日期：2014-03-25 |
| DOI： |
| 中文关键词: 不对称加氢 炭-氧化铝 Pt负载型催化剂 分散介质 重复利用 |
| 英文关键词:asymmetric hydrogenation alumina-carbon composites Pt supported catalyst dispersed medium reusability |
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| 中文摘要: |
| 螯合辅助溶剂挥发共组装法制备的炭-氧化铝复合材料为载体，分别使用水、乙醇或二者混合物为氯铂酸的分散介质，浸渍制备炭-氧化铝复合材料负载Pt催化剂。通过XRD，N2物理吸附以及TEM表征可知，乙醇作为浸渍溶剂时，最有利于Pt的分散，而混合溶剂浸渍制备的催化剂Pt颗粒最大。2-氧-4-苯基丁酸乙酯不对称加氢反应结果表明，氯铂酸水溶液浸渍得到的催化剂Pt纳米粒子的粒径有利于获得高的光学选择性，催化剂经辛可尼丁修饰后，以乙酸为反应溶剂，可获得最高84.8%的光学选择性。此外，该催化剂重复利用性能优异，可以重复利用22次，活性没有下降。 |
| 英文摘要: |
| Alumina-Carbon composites, synthesized by chelate-assistant co-assembly method, were impregnated by solution of H2PtCl6 dissolved in water, ethanol and their mixture to prepare Pt/Alumina-Carbon catalysts. Our current study by using X-ray diffraction (XRD), N2 sorption and transmission electron microscopy (TEM) revealed that ethanol solution of H2PtCl6 was favorable for the high Pt dispersion, while the catalyst prepared from the mixed solution of H2PtCl6 obtained the largest Pt particles. The results of asymmetric hydrogenation of ethyl 2-oxo-4-phenylbutyrate showed that the Pt particle size of the catalyst prepared from the aqueous solution of H2PtCl6 was in favor of high enantioselectivity. And this cinchonidine-modified catalyst afforded the highest enantiomeric excess in acetic acid. Moreover, the catalyst showed excellent reusability, which could be reused for 22 times without distinct loss in activity and enantioselectivity. |
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