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Oxidation of HCl over TiO2-supported RuO2: A density functional theory study

Seitsonen, A P; Over, H (2010). Oxidation of HCl over TiO2-supported RuO2: A density functional theory study. Journal of Physical Chemistry. C, 114(51):22624-22629.

Abstract

With density functional theory (DFT) calculations, we studied the oxidation of HCl with oxygen producing Cl2 and water on the TiO2(110)-supported RuO2(110). This so-called Sumitomo-a novel Deacon-process proceeds via a one-dimensional Langmuir?Hinshelwood mechanism, in which the recombination of two adjacent chlorine atoms on the surface of the catalyst constitutes the rate-determining step. Very important for industrial application is that substantial Ru resources can be saved in the production of the Sumitomo catalyst. According to our DFT calculations already 1 ML of RuO2(110) supported on TiO2(110) suffices to maintain practically the full activity of bulk-RuO2 in the HCl oxidation reaction. The calculated electron density differences of the TiO2(110)-supported 1 ML RuO2 system in comparison with bulk RuO2(110) are localized at the internal interface, leaving the electronic structure of the topmost undercoordinated Ru sites (active sites) unaffected by the support. This explains naturally the invariant activity of supported 1 ML RuO2(110) in comparison with bulk RuO2(110). The stoichiometric TiO2(110) is not active at all in the HCl oxidation reaction. However, if the undercoordinated Ti surface atoms are substituted by Ru then the resulting 1/2 ML RuO2-TiO2(110) catalyst is active with an activation barrier that is 58 kJ/mol higher than for bulk-RuO2(110).

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > Electronic, Optical and Magnetic Materials
Physical Sciences > General Energy
Physical Sciences > Physical and Theoretical Chemistry
Physical Sciences > Surfaces, Coatings and Films
Language:English
Date:2010
Deposited On:16 Feb 2011 18:28
Last Modified:05 Jul 2025 01:36
Publisher:American Chemical Society
ISSN:1932-7447
OA Status:Closed
Publisher DOI:https://doi.org/10.1021/jp108603a

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