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Nature communications
12 19, 2019;10 (1): 5790.

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, Junhu Wang
Author Information
  1. Shaofeng Liu: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
  2. Wei Xu: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
  3. Yiming Niu: Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China.
  4. Bingsen Zhang: Shenyang National Laboratory of Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China. ORCID
  5. Lirong Zheng: Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, 100049, China.
  6. Wei Liu: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
  7. Lin Li: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China.
  8. Junhu Wang: State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, 116023, China. wangjh@dicp.ac.cn. ORCID
PMID: 31857592 DOI: 10.1038/s41467-019-13755-5

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 TiO thin layer induced by melamine under oxidative atmosphere. Owning to the formed TiO 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 TiO and commercial gold catalyst denoted as RR2Ti, providing a universal way to engineer and develop highly stable supported Au catalysts with tunable activity.

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