Chemisorption geometry, vibrational spectra, and thermal desorption of formic acid on TiO2(110)

S. A. Chambers, M. A. Henderson, Y. J. Kim, S. Thevuthasan

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We have used high-energy X-ray photoelectron spectroscopy and diffraction (XPS/XPD), lowenergy electron diffraction (LEED), high-resolution electron energy loss spectroscopy (HREELS) and temperature-programmed desorption (TPD) to determine the molecular orientation, long-range order, vibrational frequencies, and desorption temperatures for formic acid and its decomposition products on TiO2(110). Molecular adsorption occurs at coverages approaching one monolayer, producing a weakly ordered (2 ×1) surface structure. High-energy XPD reveals that the formate binds rigidly in a bidentate fashion through the oxygens to Ti cation rows along the [001] direction with an O-C-O bond angle of 126 ±4°. During TPD some surface protons and formate anions recombine and desorb as formic acid above 250 K. However, most of the decomposition products follow reaction pathways leading to H2O, CO and H2CO desorption. Water is formed in TPD below 500 K via the abstraction of lattice oxygen by deposited acid protons.

Original languageEnglish
Pages (from-to)381-385
Number of pages5
JournalSurface Review and Letters
Issue number1
Publication statusPublished - 1998
Externally publishedYes


ASJC Scopus subject areas

  • Materials Science(all)
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Surfaces and Interfaces

Cite this

Chambers, S. A., Henderson, M. A., Kim, Y. J., & Thevuthasan, S. (1998). Chemisorption geometry, vibrational spectra, and thermal desorption of formic acid on TiO2(110). Surface Review and Letters, 5(1), 381-385.