Adsorption and Reaction of Methanol on Stoichiometric and Defective SrTiO{sub 3}(100) Surfaces
The adsorption and reaction of methanol (CH{sub 3}OH) on stoichiometric (TiO{sub 2}-terminated) and reduced SrTiO{sub 3}(100) surfaces have been investigated using temperature programmed desorption (TPD), X-ray photoelectron spectroscopy (XPS) and first-principles density-functional calculations. Methanol adsorbs mostly nondissociatively on the stoichiometric SrTiO{sub 3}(100) surface that contains predominantly Ti{sup 4+} cations. Molecular desorption of methanol from the stoichiometric surface is observed at {approx}250 K whereas the multilayer is found to desorb at {approx}160 K. Theoretical calculations predict weak adsorption of methanol on TiO{sub 2}-terminated SrTiO{sub 3}(100) surfaces, in agreement with the experimental results. However, the reduced SrTiO{sub 3}(100) surface containing substantial amounts of Ti{sup 3+} cations exhibits higher reactivity towards adsorbed methanol and H{sub 2}, C{sub 2}H{sub 4}, and CO are the major decomposition products observed on the reduced surface. The surface defects on the reduced SrTiO{sub 3}(100) surface are partially reoxidized upon saturation exposure of CH{sub 3}OH onto this surface at 300 K.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 15016047
- Report Number(s):
- PNNL-SA-41362; 1907; KC0201050; TRN: US200509%%793
- Journal Information:
- Journal of Physical Chemistry B, Vol. 109, Issue 10; Other Information: PBD: 17 Mar 2005
- Country of Publication:
- United States
- Language:
- English
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