Funktionalisierung poröser Goldsysteme

Abstract

The controlled functionalization of the surface of nanoporous gold (npAu) was investigated. The npAu was used as a platform for tailored modification with entities such as metal oxides, ad-metals or organic molecules for influencing surface chemistry in heterogeneous catalysis. TiO2 and PrOx were deposited by ALD, CVD and liquid phase impregnation on the npAu. The oxide-npAu material showed remarkable activity (already at 25°C) and stability up to 600 °C with respect to CO oxidation as well as NO reduction. Critical parameters regarding the oxidative coupling of primary alcohols and amines to amides were identified on bare npAu. These insights were used for tuning the surface composition by introducing small quantities of Ag and Ru resulting in an increase of activity by a factor of 2.5. In a 2-step synthetic route npAu was functionalized with a) redox-active entities for electrochemical applications and b) photoactive entities for enhanced photocatalytic conversion of Citronellol.