Dorothee Stodt^a), Heshmat Noei^1,b), Christof Hättig^c), Yuemin Wang ^1d),
¹ Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, D-44780 Bochum, Germany

Phys. Chem. Chem. Phys. 15, 466-472 (2013).
(Received 31 Jul 2012, Accepted 24 Oct 2012 First published on the web 25 Oct 2012)

In this work we combined computational density functional theory with experimental infrared spectroscopy to determine the adsorbate structure of NO and its reaction products N₂O₂, N₂O, and NO₂ on rutile TiO₂. These reactions are important for the photo-catalytic reduction of NO in exhaust gas, but yet little is known about the mechanisms or the intermediates involved. The combination of high-quality ultrahigh vacuum FTIRS data with large scale embedded cluster calculations using an accurate hybrid density functional rendered it possible to identify and assign unambiguously vibrational frequencies for nine species which are formed upon adsorption and reaction of NO on rutile TiO₂. Some of them have been observed for the first time. As a result of the quantum chemical calculations we can report for all adsorbates accurate structures and binding energies.

^a) Electronic mail: dorothee.stodt@rub.de
^b) Electronic mail: heshmat.noei@rub.de
^c) Electronic mail: christof.haettig@rub.de
^d) Electronic mail: wang@pc.rub.de

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