Innovative preparation of Au/C by replication of gold-containing mesoporous silica catalysts

F. Kerdi, V. Caps, A. Tuel
Studies in Surface Science and Catalysis, volume 175, 221-224, (2010)

Innovative preparation of Au/C by replication of gold-containing mesoporous silica catalysts

Keywords

Mesostructured carbon,  Gold nanoparticles,  Catalysis,  Aerobic oxidation

Abstract

​A new strategy, based on the nanocasting concept, has been used to prepare gold nanoparticles (NPs) highly dispersed in meso-structured carbons. Gold is first introduced in various functionalized mesostructured silicas (MCM-48 and SBA-15) and particles are formed inside the porosity upon reduction of Au3+ cations. Silica pores are then impregnated with a carbon precursor and the composite material is heated at 900 °C under vacuum. Silica is then removed by acid leaching, leading to partially encapsulated gold particles in mesoporous carbon. Carbon prevents aggregation of gold particles at high temperature, both the mean size and distribution being similar to those observed in silica. However, while Au@SiO2 exhibit significant catalytic activity in the aerobic oxidation of trans-stilbene in the liquid phase, its Au@C mesostructured replica is quite inactive.

Code

DOI:  10.1016/S0167-2991(10)75028-X

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