Au/FeOx催化3-硝基苯乙烯加氢反应

Hydrogenation of 3-Nitrostyrene over Au/FeO_x Catalysts

采用沉积-沉降法制备了负载型Au/γ-Fe2O3、Au/α-Fe2O3和Au/Fe3O4催化剂,并利用X射线粉末衍射技术对催化剂进行了表征。在不同反应介质(水、乙醇和无溶剂)中,研究了Au/FeOx催化剂催化3-硝基苯乙烯加氢反应,考察了反应温度以及载体对催化剂活性的影响。实验结果表明,在介质水中3-硝基苯乙烯的转化率要远高于乙醇中或无溶剂条件下的转化率,且随温度的升高而增大,而其加氢产物3-氨基苯乙烯的选择性无显著变化。不同氧化铁载体负载的Au催化剂在水中的活性顺序为Au/γ-Fe2O3>Au/α-Fe2O3>Au/Fe3O4,其活性的差异被认为来自于不同氧化铁载体与Au之间的相互作用。

Au/γ-Fe2O3,Au/α-Fe2O3 and Au/Fe3O4 catalysts were prepared via deposition-precipitation methods and characterized by X-ray diffraction.The catalytic performance of these catalysts was studied and compared for the hydrogenation of 3-nitrostyrene.In addition,the influences of temperature,support as well as the reaction medium were discussed.The results showed that the conversion of 3-nitrostyrene in H2O is much higher than that in ethanol and solvent-free system,and it increased with increasing of temperature,however,the selectivity to 3-aminostyrene did not change.The catalytic activity of Au/FeOx catalysts was in an order of Au/γ-Fe2O3Au/α-Fe2O3Au/Fe3O4.The different reducibility of the iron oxide supports may be the main reason for such a catalytic activity.