Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 26: Oxides and Insulator Surfaces: Adsorption
O 26.1: Poster
Montag, 7. März 2016, 18:15–20:30, Poster E
Vibrational Spectroscopic Studies of Formaldehyde Adsorption on Rutile TiO2(110) — •Xiaojuan Yu1, Chengwu Yang1, Fabian Bebensee1, Alexei Nefedov1, Zhenrong Zhang2, Qingfeng Ge3, Zdenek Dohnálek4, Yuemin Wang1, and Christof Wöll1 — 1Institute of Functional Interfaces, Karlsruhe Institute of Technology, 76344 Karlsruhe, Germany — 2Department of Physics, Baylor University, Waco, Texas 76798, USA — 3Department of Chemistry and Biochemistry, Southern Illinois University, Carbondale, Illinois 62901, USA — 4Institute for Interfacial Catalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
TiO2 is one of the most important metal oxides used in catalysis and photocatalysis. The interaction of TiO2 with aldehydes is of particular interest due to its promising applications in ethanol fuel cells, hydrogen production, biomass and in the control of air pollution. Here, the adsorption of formaldehyde (CH2O) on the rutile TiO2(110) surface was studied by infrared reflection-absorption spectroscopy (IRRAS). The IR data reveal the presence of different species depending on the temperature and coverage. The CH2O monomer is identified after submonolayer adsorption at 70 K, in which CH2O is weakly bound to the surface Ti5c sites. Further adsorption at 70 K leads to the formation of multilayer CH2O, which desorbs completely upon heating to 120 K. Simultaneously, paraformaldehyde is formed at Ti5c sites along [001] direction and becomes the dominant surface species. In addition, dioxymethylene is detected as a minority one formed via reaction of CH2O with neighboring Obr along [1-10] direction.