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Li H, Weng X, Tang Z, Zhang H, Ding D, Chen M, Wan H. Evidence of the Encapsulation Model for Strong Metal–Support Interaction under Oxidized Conditions: A Case Study on TiOx/Pt(111) for CO Oxidation by in Situ Wide Spectral Range Infrared Reflection Adsorption Spectroscopy. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02883] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Huan Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Xuefei Weng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Zhenyan Tang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Hong Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Ding Ding
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Mingshu Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
| | - Huilin Wan
- State Key Laboratory of Physical Chemistry of Solid Surfaces, National Engineering Laboratory for Green Chemical Productions of Alcohols−Ethers−Esters, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, Fujian, People’s Republic of China
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Gubó R, Yim CM, Allan M, Pang CL, Berkó A, Thornton G. Variation of SMSI with the Au:Pd Ratio of Bimetallic Nanoparticles on TiO 2(110). Top Catal 2017; 61:308-317. [PMID: 31258302 PMCID: PMC6560464 DOI: 10.1007/s11244-017-0854-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Au/Pd nanoparticles are important in a number of catalytic processes. Here we investigate the formation of Au-Pd bimetallic nanoparticles on TiO2(110) and their susceptibility to encapsulation using scanning tunneling microscopy, as well as Auger spectroscopy and low energy electron diffraction. Sequentially depositing 5 MLE Pd and 1 MLE Au at 298 K followed by annealing to 573 K results in a bimetallic core and Pd shell, with TiOx encapsulation on annealing to ~ 800 K. Further deposition of Au on the pinwheel type TiOx layer results in a template-assisted nucleation of Au nanoclusters, while on the zigzag type TiOx layer no preferential adsorption site of Au was observed. Increasing the Au:Pd ratio to 3 MLE Pd and 2 MLE Au results in nanoparticles that are enriched in Au at their surface, which exhibit a strong resistance towards encapsulation. Hence the degree of encapsulation of the nanoparticles during sintering can be controlled by tuning the Au:Pd ratio.
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Affiliation(s)
- Richard Gubó
- Department of Applied and Environmental Chemistry, University of Szeged, Rerrich B. tér 1., 6720 Szeged, Hungary
- ELI-HU Nonprofit Kft, Extreme Light Infrastructure-ALPS, Dugonics tér 13, 6720 Szeged, Hungary
| | - Chi M. Yim
- London Centre for Nanotechnology and Chemistry Department, University College London, 20 Gordon Street, London, WC1H 0AJ UK
| | - Michael Allan
- London Centre for Nanotechnology and Chemistry Department, University College London, 20 Gordon Street, London, WC1H 0AJ UK
| | - Chi L. Pang
- London Centre for Nanotechnology and Chemistry Department, University College London, 20 Gordon Street, London, WC1H 0AJ UK
| | - András Berkó
- MTA-SZTE Reaction Kinetics and Surface Chemistry Research Group, Rerrich B. tér 1., 6720 Szeged, Hungary
| | - Geoff Thornton
- London Centre for Nanotechnology and Chemistry Department, University College London, 20 Gordon Street, London, WC1H 0AJ UK
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