Abstract：A variety of synthesis parameters for the preparation of gold nanoparticles by NaBH4 solution reduction in the W／O microemulsion media consisting of Cetyl Trimethyl Ammonium Bromide(CTAB)／n-hexanol／water system was investigated. The results showed that the molar ratio of water to surfactant (rw) had nothing to do with the gold particle size, but the concentration of the aqueous gold salt solution had a significant effect on the size of gold particle. Through optimizing the preparation parameters, Au／Al2O3 catalysts were prepared with two different methods, then the catalysts were characterized by ultraviolet-visible spectra, XRD and TEM, and the effect of two different preparation methods on active component gold particle size in the catalysts was studied.
Key words：Microemulsion;Size of gold particle;Ultraviolet-visible spectra;Au／Al2O3 catalysts
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