Effect of LaFeO3 Decoration and Ozone Treatment on Thermal Stability of Au/Al2O3 for CO Oxidation

Boosting the catalysis of gold by O2 activation at Au-SiO2 interface

Supported gold (Au) nanocatalysts have attracted extensive interests in the past decades because of their unique catalytic properties for a number of key chemical reactions, especially in (selective) oxidations. The activation of O₂ on Au nanocatalysts is crucial and remains a challenge because only small Au nanoparticles (NPs) can effectively activate O₂. This severely limits their practical application because Au NPs inevitably sinter into larger ones during reaction due to their low Taman temperature. Here we construct a Au-SiO₂ interface by depositing thin SiO₂ layer onto Au/TiO₂ and calcination at high temperatures and demonstrate that the interface can be not only highly sintering resistant but also extremely active for O₂ activation. This work provides insights into the catalysis of Au nanocatalysts and paves a way for the design and development of highly active supported Au catalysts with excellent thermal stability.

The development of sintering resistant supported Au catalysts with high activity still remains a challenge. Here the authors construct a Au-SiO₂ interface by depositing SiO₂ thin layer onto Au/TiO₂ catalyst which shows very high activity in CO oxidation even after calcination at 800 °C.

Highly active and stable Au@CuxO core–shell nanoparticles supported on alumina for carbon monoxide oxidation at low temperature

Au@CuxO core–shell nanoparticles and Au@CuxO/Al₂O₃used for CO oxidation at low temperature are prepared. CO conversion on Au@CuxO/Al₂O₃can reach to 38% at room temperature and the catalytic activity remains unchanged after 108 hours reaction.