| 于剑锋,杨宇.Dawson结构钼钒磷杂多化合物催化乙苯选择氧化的活性研究[J].分子催化,1997,(3):167-172 |
| Dawson结构钼钒磷杂多化合物催化乙苯选择氧化的活性研究 |
| Selective Oxidation of Ethylbenzene over Molybdovanadophophoric Compounds with Dawson Structure |
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| DOI： |
| 中文关键词: Dawson结构 催化 杂多化合物 乙苯 氧化 苯乙酮 |
| 英文关键词:Heteropoly compounds with Dawson structure, Selective oxidation of ethylbenzene, Acetophenone, Hydrogen peroxide, |
| 基金项目:国家自然科学基金 |
| 于剑锋 杨宇 |
| 吉林大学化学系理论化学研究所 |
| 摘要点击次数: 1745 |
| 全文下载次数: 18 |
| 中文摘要: |
| 合成了系列Ｄａｗｓｏｎ结构钼钒杂多化合物，并将其用于 苯的过氧化氢选择氧化研究，实验发现，对于该类反应，其最佳的工艺条件为：乙苯２．５ｍｍｏｌ，催化剂０．０２ｍｍｏｌ，溶剂１０ｍＬ、３０％Ｈ２Ｏ２２．５ｍｍｏｌ，乙酸为该类最佳溶剂，而在与之性质相近的甲酸中则活性极低，即该反应过程与过氧酸的存在无关，讨论了反应过程中催化剂的状态及活性中间体，并运用ＵＶ－Ｖｉｓ、ＥＳＲ等手段进行了表征，实验结果有最佳 |
| 英文摘要: |
| A series of heteropoly compounds with Dawson structrue were synthesized and were used to catalyze the selective oxidation of ethylbenzene with hydrogen peroxide. The reaction parameters were investigated in deteil. The results indicated that the catalysts had excellent catalytic activity for the reaction. The optimal conditions of the reaction are that ethylbenzene is 2.5 mmol, catalyst is 0.02 mmol, solvent is 10 mL and 30% H 2O 2 is 2.5 mmol. It should be emphasized that the possible role of the peracid appears to be somewhat ambiguous. Although acetic acid is the preferred solvent indicating that peracetic acid may be the preferred primary oxidant, but when formic acid was used as solvent, where performic acid is easily formed, there was practically no reaction. In solvents such as acetonitrile and sulfolane there were significant conversions. The fact that the heteropoly acids with Dawson structure without vanadium do not significantly decompose hydrogen peroxide or oxidize ethylbenzene, clearly indicates that the reaction must proceed by homolytic cleavage at the vanadium atom. So V is considered to be the active component for the reaction. The intermediate material of the reaction is the P Mo V peroxo identified by means of UV Vis spectra and ESR. |
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