Highly active and stable Au@CuₓO core–shell nanoparticles supported on alumina for carbon monoxide oxidation at low temperature
2016
Zhang, Weining | Zhao, Qingguo | Wang, Xiaohong | Yan, Xiaoxia | Han, Sheng | Tseng, Tommaso
Au@CuₓO (x = 1 or 2) core–shell heterostructure nanoparticles (NPs) are synthesized by a facile aqueous solution approach. γ-Alumina support Au@CuₓO (Au@CuₓO/γ-Al₂O₃) catalysts used for CO oxidation at low temperature are prepared by dispersing the core–shell NPs on the surface of γ-alumina. It proves that the formation of the core–shell structure has led to the interaction between Au and CuₓO and the co-existence of Auᵟ⁺ and Au⁰, which accounts for the improvement in catalytic activity. It can even catalyze CO oxidation at room temperature and the conversion of CO can reach to 38%. In the same case, Au/γ-Al₂O₃ does not have any catalytic activity. In particular, the embedding of Au NPs into CuₓO shells has also improved the catalytic stability of Au based catalysts remarkably, which remains unchanged after 108 hours of reaction. To the best of our knowledge, Au@CuₓO/γ-Al₂O₃ is really one of the most stable catalysts with adequate activity at room temperature.
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