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采用原位还原技术制备出以单壁碳纳米管、炭黑(P90)和TiO_2为支撑的3种金纳米复合材料,并通过多种表征手段来探讨物理性能。再将他们作为1-苯基乙醇、2-苯基乙醇和苯甲醇的绿色需氧氧化杂化催化剂来测试稳定性。在所有反应中,与P90和TiO_2相比,以单壁碳纳米管作支撑的金纳米杂化催化剂呈现出最优的反应效率和特异性。这些金纳米杂化催化剂经多次反应循环后反应活性衰减很小,从而能被重复使用。同时探讨了金纳米杂化催化剂活性高的原因,包括颗粒形貌、尺寸和支撑体性能。可以推断,基底上功能团迁移的位置、支撑材料的性质和活性金纳米颗粒相的颗粒尺寸分布均有助于使这些催化剂在反应中显示出高的选择性。
Three kinds of gold nanocomposites supported on single-walled carbon nanotubes, carbon black (P90) and TiO 2 were prepared by in-situ reduction technique and the physical properties were investigated by various characterization methods. They were also tested for stability as green aerobic hybrid catalysts for 1-phenylethanol, 2-phenylethanol and benzyl alcohol. In all reactions, single-walled carbon nanotubes supported gold nanoparticles hybrid catalysts showed the best reaction efficiency and specificity compared with P90 and TiO 2. These gold nano-hybrid catalyst after repeated reaction cycle activity of small attenuation, which can be reused. The reasons for the high activity of gold nanocomposite catalysts were also discussed, including particle morphology, size and support properties. It can be inferred that the migration of functional groups on the substrate, the nature of the support material, and the particle size distribution of the active gold nanoparticle phase all contribute to the high selectivity of these catalysts in the reaction.