精品文档---下载后可任意编辑Au@Rhγ-Al2O3 纳米催化剂的制备及其反应活性的讨论中期报告Abstract:In this work, Au@Rhγ-Al2O3 nanocatalysts were prepared using co-impregnation method and tested for their catalytic activity in the selective hydrogenation of 4-nitrophenol to 4-aminophenol. The effects of various parameters such as the preparation method, calcination temperature, metal loading, and reaction conditions on the catalytic performance were investigated. The results showed that the prepared Au@Rhγ-Al2O3 nanocatalysts exhibited excellent catalytic activity and selectivity for the hydrogenation of 4-nitrophenol to 4-aminophenol, which is a promising candidate for industrial applications.Introduction:Selective hydrogenation of 4-nitrophenol to 4-aminophenol is an important reaction for the production of various chemicals. The selective hydrogenation can be catalyzed by various metal catalysts, including Au, Pd, Pt, and Rh, etc. Among these catalysts, bimetallic catalysts consisting of noble metals have shown superior catalytic activity and selectivity due to their strong electronic interactions and synergistic effects. Particularly, Au@Rhγ-Al2O3 nanocatalysts have attracted much attention due to their strong synergistic effects and high stability.Experimental:Au@Rhγ-Al2O3 nanocatalysts were prepared using co-impregnation method. In a typical procedure, γ-Al2O3 was first calcined at 500 °C for 4 hours to remove water and impurities. Then, a certain amount of Rh and Au precursors were dissolved in deionized water and impregnated onto the γ-Al2O3 support. The impregnated samples were dried at 110 °C in air for 2 hours and then calcined at various temperatures (200-500 °C) for 4 hours. The metal loading was controlled to be 1 wt% for e...
