Classical strong metal–support interactions between gold nanoparticles and titanium dioxide
Hailian Tang,Hailian Tang,Yang Su,Bingsen Zhang,Adam F. Lee,Mark A. Isaacs,Karen Wilson,Lin Li,Yuegong Ren,Yuegong Ren,Jiahui Huang,Masatake Haruta,Masatake Haruta,Botao Qiao,Xin Liu,Changzi Jin,Dang Sheng Su,Dang Sheng Su,Junhu Wang,Tao Zhang,Tao Zhang +20 more
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TLDR
A classical SMSI is demonstrated for Au/TiO2, evidenced by suppression of CO adsorption, electron transfer from TiO2 to Au nanoparticles, and gold encapsulation by a TiOx overlayer following high-temperature reduction (reversed by subsequent oxidation), akin to that observed for titania-supported platinum group metals.Abstract:
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/TiO2, evidenced by suppression of CO adsorption, electron transfer from TiO2 to Au nanoparticles, and gold encapsulation by a TiOx overlayer following high-temperature reduction (reversed by subsequent oxidation), akin to that observed for titania-supported platinum group metals. In the SMSI state, Au/TiO2 exhibits markedly improved stability toward CO oxidation. The SMSI extends to Au supported over other reducible oxides (Fe3O4 and CeO2) 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.read more
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Control of metal-support interactions in heterogeneous catalysts to enhance activity and selectivity
TL;DR: In this paper, a review of metal-support interaction tuning strategies to enhance catalytic performance for various reactions is presented, showing that up to fifteen-fold productivity enhancement has been achieved, and that metal support interaction is most impactful for metal nanoparticles smaller than four nanometres.
Journal ArticleDOI
Importance of Size and Contact Structure of Gold Nanoparticles for the Genesis of Unique Catalytic Processes.
TL;DR: How the unique catalytic abilities of Au are generated with respect to (a) the contact structures between Au and its supports and (b) the size of the Au particles is disclosed.
References
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Journal ArticleDOI
Single-atom catalysis of CO oxidation using Pt1/FeOx
Botao Qiao,Aiqin Wang,Xiaofeng Yang,Lawrence F. Allard,Zheng Jiang,Yi-Tao Cui,Jingyue Liu,Jingyue Liu,Jun Li,Tao Zhang +9 more
TL;DR: Density functional theory calculations show that the high catalytic activity correlates with the partially vacant 5d orbitals of the positively charged, high-valent Pt atoms, which help to reduce both the CO adsorption energy and the activation barriers for CO oxidation.
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Strong metal-support interactions. Group 8 noble metals supported on titanium dioxide
Journal ArticleDOI
The impact of nanoscience on heterogeneous catalysis
TL;DR: Advances in characterization methods have led to a molecular-level understanding of the relationships between nanoparticle properties and catalytic performance, and this knowledge is contributing to the design and development of new catalysts.
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The Structure of Catalytically Active Gold on Titania
Mingshu Chen,D. W. Goodman +1 more
TL;DR: Kinetic measurements for the catalytic oxidation of carbon monoxide show that the gold bilayer structure is significantly more active than the monolayer, thus eliminating particle shape and direct support effects.
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Strong metal-support interactions
TL;DR: The nature and action of metal catalysts on solid supports, especially from the standpoint of industrial processes, were the subjects of a symposium held in Miami Beach in 1985.