Abstract
Influence of the metal oxide support, method of gold deposition and calcination temperature on the size and morphology of the nano-size gold particles deposited on alkaline earth metal oxides has been investigated. A number of alkaline earth oxide (viz. Mgo, CaO, SrO or BaO) supported nano-gold catalysts were prepared by depositing gold on the support by the deposition precipitation (DP) and homogeneous deposition precipitation (HDP) methods. The catalysts were calcined at different temperatures (400°C-900°C). The catalysts were characterised for their Au particles (size and morphology) using TEM/HRTEM. The catalytic activity of the supported nano-gold catalysts in the epoxidation of styrene to styrene oxide by tertiary butyl hydroperoxide could be correlated well with the Au loading and/or Au particle size of the catalysts.
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