中文摘要：

采用吸附相反应技术，以硅胶为载体，Ni（OH）2为修饰组分，在水／乙醇体系中制备得到了Au、Ag以及Au-Ag双金属负载型催化剂。通过X射线衍射（XRD），透射电子显微镜（TEM），紫外．可见漫反射光谱（UV-Visdiffuse．reflectancespectra）等手段对催化剂进行了表征，结果表明Au，Ag以及Au-Ag的粒子粒径在纳米级别，分散性好，并且在微观尺度结合较好。在70℃的温和条件下，以叔丁基过氧化氢（TBHP）为氧化剂，考评催化剂在无溶剂条件下环己烷氧化反应中的活性，证明了Au、Ag均有一定的低温活性，Au、Ag共负载时则表现出了很好的协同作用，催化剂的活性和稳定性均有所提高；随着Ag负载量的增大，催化剂的活性提高。

英文摘要：

Catalysts of Au, Ag and Au-Ag bimetallic nanoparticles supported on SiO2 modified by Ni（OH）2 were synthesized via adsorption phase reaction technique in water/ethanol system. The X-ray diffraction （XRD）, transmission electron microscope （TEM） and ultraviolet-visible diffuse-reflectance spectra （UV-Vis DRS） were employed to characterize the prepared catalysts. The results show that the Au, Ag and Au-Ag particles have the sizes of nanometer and disperse well on the support. When the prepared catalysts are used in the catalytic oxidation of cyclohexane with tert-butyl hydroperoxide as oxidant at mild temperature of 70℃ and without solvent, both Au and Ag show having activity under low temperature. Au-Ag bimetallic catalysts show obvious synergetic effect resulting in higher activity and stability. It was also found that the activity of prepared Au-Ag bimetallic catalysts increases with the increase of Ag content.