Ultrastable Au nanoparticles on titania through an encapsulation strategy under oxidative atmosphere

Shaofeng Liu, Wei Xu, Yiming Niu, Bingsen Zhang, Lirong Zheng, Wei Liu, Lin Li and Junhu Wang ()
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Shaofeng Liu: Chinese Academy of Sciences
Wei Xu: Chinese Academy of Sciences
Yiming Niu: Chinese Academy of Sciences
Bingsen Zhang: Chinese Academy of Sciences
Lirong Zheng: Chinese Academy of Sciences
Wei Liu: Chinese Academy of Sciences
Lin Li: Chinese Academy of Sciences
Junhu Wang: Chinese Academy of Sciences

Nature Communications, 2019, vol. 10, issue 1, 1-9

Abstract: Abstract Supported gold catalysts play a crucial role in the chemical industry; however, their poor on-stream stability because of the sintering of the gold nanoparticles restricts their practical application. The strong metal-support interaction (SMSI), an important concept in heterogeneous catalysis, may be applied to construct the structure of catalysts and, hence, improve their reactivity and stability. Here we report an ultrastable Au nanocatalyst after calcination at 800 °C, in which Au nanoparticles are encapsulated by a permeable TiOx thin layer induced by melamine under oxidative atmosphere. Owning to the formed TiOx overlayer, the resulting Au catalyst is resistant to sintering and exhibits excellent activity and stability for catalytic CO oxidation. Furthermore, this special strategy can be extended to colloidal Au nanoparticles supported on TiO2 and commercial gold catalyst denoted as RR2Ti, providing a universal way to engineer and develop highly stable supported Au catalysts with tunable activity.

Date: 2019
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DOI: 10.1038/s41467-019-13755-5

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