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Classical strong metal–support interactions between gold nanoparticles and titanium dioxide

Supported metal catalysts play a central role in the modern chemical industry but often exhibit poor on-stream stability. The strong metal–support interaction (SMSI) offers a route to control the structural properties of supported metals and, hence, their reactivity and stability. Conventional wisdo...

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Detalles Bibliográficos
Autores principales: Tang, Hailian, Su, Yang, Zhang, Bingsen, Lee, Adam F., Isaacs, Mark A., Wilson, Karen, Li, Lin, Ren, Yuegong, Huang, Jiahui, Haruta, Masatake, Qiao, Botao, Liu, Xin, Jin, Changzi, Su, Dangsheng, Wang, Junhu, Zhang, Tao
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5640381/
https://www.ncbi.nlm.nih.gov/pubmed/29043293
http://dx.doi.org/10.1126/sciadv.1700231
Descripción
Sumario:Supported metal catalysts play a central role in the modern chemical industry but often exhibit poor on-stream stability. The strong metal–support interaction (SMSI) offers a route to control the structural properties of supported metals and, hence, their reactivity and stability. Conventional wisdom holds that supported Au cannot manifest a classical SMSI, which is characterized by reversible metal encapsulation by the support upon high-temperature redox treatments. We demonstrate a classical SMSI for Au/TiO(2), evidenced by suppression of CO adsorption, electron transfer from TiO(2) to Au nanoparticles, and gold encapsulation by a TiO(x) overlayer following high-temperature reduction (reversed by subsequent oxidation), akin to that observed for titania-supported platinum group metals. In the SMSI state, Au/TiO(2) exhibits markedly improved stability toward CO oxidation. The SMSI extends to Au supported over other reducible oxides (Fe(3)O(4) and CeO(2)) and other group IB metals (Cu and Ag) over titania. This discovery highlights the general nature of the classical SMSI and unlocks the development of thermochemically stable IB metal catalysts.