Model Catalyst Studies of the Strong Metal-Support Interaction: Surface Structure Identified by STM on Pd Nanoparticles on TiO2(110) Full article
| Journal |
Journal of Catalysis
ISSN: 0021-9517 , E-ISSN: 1090-2694 |
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| Output data | Year: 2005, Volume: 234, Number: 1, Pages: 172-181 Pages count : 10 DOI: 10.1016/j.jcat.2005.05.024 | ||||||
| Tags | CO adsorption, Pd nanoparticles, SMSI, STM, Strong metal-support interaction | ||||||
| Authors |
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| Affiliations |
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Funding (5)
| 1 | Cardiff University | |
| 2 | The University of Reading | |
| 3 | Engineering and Physical Sciences Research Council | GR/L22584 |
| 4 | Engineering and Physical Sciences Research Council | GR/R89882 |
| 5 | Royal Society |
Abstract:
Model catalysts of Pd nanoparticles and films on TiO2(110) were fabricated by metal vapour deposition (MVD). Molecular beam measurements show that the particles are active for CO adsorption, with a global sticking probability of 0.25, but that they are deactivated by annealing above 600 K, an effect indicative of SMSI. The Pd nanoparticles are single crystals oriented with their (111) plane parallel to the surface plane of the titania. Analysis of the surface by atomic resolution STM shows that new structures have formed at the surface of the Pd nanoparticles and films after annealing above 800 K. There are only two structures, a zigzag arrangement and a much more complex “pinwheel” structure. The former has a unit cell containing 7 atoms, and the latter is a bigger unit cell containing 25 atoms. These new structures are due to an overlayer of titania that has appeared on the surface of the Pd nanoparticles after annealing, and it is proposed that the surface layer that causes the SMSI effect is a mixed alloy of Pd and Ti, with only two discrete ratios of atoms: Pd/Ti of 1:1 (pinwheel) and 1:2 (zigzag). We propose that it is these structures that cause the SMSI effect.
Cite:
Bowker M.
, Stone P.
, Morrall P.
, Smith R.
, Bennett R.
, Perkins N.
, Kvon R.
, Pang C.
, Fourre E.
, Hall M.
Model Catalyst Studies of the Strong Metal-Support Interaction: Surface Structure Identified by STM on Pd Nanoparticles on TiO2(110)
Journal of Catalysis. 2005. V.234. N1. P.172-181. DOI: 10.1016/j.jcat.2005.05.024 WOS Scopus РИНЦ ANCAN OpenAlex
Model Catalyst Studies of the Strong Metal-Support Interaction: Surface Structure Identified by STM on Pd Nanoparticles on TiO2(110)
Journal of Catalysis. 2005. V.234. N1. P.172-181. DOI: 10.1016/j.jcat.2005.05.024 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Feb 9, 2005 |
| Accepted: | May 26, 2005 |
| Published online: | Jul 19, 2005 |
| Published print: | Aug 15, 2005 |
Identifiers:
| Web of science: | WOS:000231326200018 |
| Scopus: | 2-s2.0-23144465259 |
| Elibrary: | 13497569 |
| Chemical Abstracts: | 2005:708587 |
| Chemical Abstracts (print): | 143:293149 |
| OpenAlex: | W2096538804 |