Electronic State of Ruthenium Deposited onto Oxide Supports: An XPS Study Taking into Account the Final State Effects Full article
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Applied Surface Science
ISSN: 0169-4332 |
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| Output data | Year: 2011, Volume: 258, Number: 4, Pages: 1541-1550 Pages count : 10 DOI: 10.1016/j.apsusc.2011.09.127 | ||||
| Tags | Differential charging, Electronic state, Oxide supports, Ruthenium, XPS | ||||
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Funding (1)
| 1 | Президиум РАН | 10.4 |
Abstract:
The electronic state of ruthenium in the supported Ru/EOx (EOx = MgO, Al2O3 or SiO2) catalysts prepared by with the use of Ru(OH)Cl3 or Ru(acac)3 (acac = acetylacetonate) and reduced with H2 at 723 K is characterized by X-ray photoelectron spectroscopy (XPS) in the Ru 3d, Cl 2p and O 1s regions. The influence of the final state effects (the differential charging and variation of the relaxation energy) on the binding energy (BE) of Ru 3d5/2 core level measured for supported Ru nanoparticles is estimated by comparison of the Fermi levels and the modified Auger parameters determined for the Ru/EOx samples with the corresponding characteristics of the bulk Ru metal. It is found that the negative shift of the Ru 3d5/2 peak which is observed in the spectrum of ruthenium deposited onto MgO (BE = 279.5–279.7 eV) with respect to that of Ru black (BE = 280.2 eV) or ruthenium supported on γ-Al2O3 and SiO2 (BE = 280.4 eV) is caused not by the transfer of electron density from basic sites of MgO, as considered earlier, but by the differential charging of the supported Ru particles compared with the support surface. Correction for the differential charging value reveals that the initial state energies of ruthenium in the Ru/EOx systems are almost identical (BE = 280.5 ± 0.1 eV) irrespectively of acid–base properties of the support, the mean size of supported Ru crystallites (within the range of 2–10 nm) and the surface Cl content. The results obtained suggest that the difference in ammonia synthesis activity between the Ru catalysts supported on MgO and on the acidic supports is accounted for by not different electronic state of ruthenium on the surface of these oxides but by some other reasons.
Cite:
Larichev Y.V.
, Moroz B.L.
, Bukhtiyarov V.I.
Electronic State of Ruthenium Deposited onto Oxide Supports: An XPS Study Taking into Account the Final State Effects
Applied Surface Science. 2011. V.258. N4. P.1541-1550. DOI: 10.1016/j.apsusc.2011.09.127 WOS Scopus РИНЦ ANCAN OpenAlex
Electronic State of Ruthenium Deposited onto Oxide Supports: An XPS Study Taking into Account the Final State Effects
Applied Surface Science. 2011. V.258. N4. P.1541-1550. DOI: 10.1016/j.apsusc.2011.09.127 WOS Scopus РИНЦ ANCAN OpenAlex
Dates:
| Submitted: | Feb 16, 2011 |
| Accepted: | Sep 29, 2011 |
| Published online: | Oct 6, 2011 |
| Published print: | Dec 1, 2011 |
Identifiers:
| Web of science: | WOS:000297265200045 |
| Scopus: | 2-s2.0-81555214056 |
| Elibrary: | 18014875 |
| Chemical Abstracts: | 2011:1492822 |
| Chemical Abstracts (print): | 156:60736 |
| OpenAlex: | W1969346501 |