AVS 53rd International Symposium
    Surface Science Tuesday Sessions
       Session SS-TuP

Paper SS-TuP40
Methanol Adsorption on Clean and O-Predosed V(100) Surfaces

Tuesday, November 14, 2006, 6:00 pm, Room 3rd Floor Lobby

Session: Surface Science Poster Session
Presenter: M. Shen, University of California, Riverside
Authors: M. Shen, University of California, Riverside
F. Zaera, University of California, Riverside
Correspondent: Click to Email
The reaction of methanol have been studied on the clean and O-covered V(100) surfaces. On the clean surfaces, adsorbed methanol follows various reaction pathways leading to the production of methane, carbon monoxide, formaldehyde, and ethylene the main carbon-containing desorbing compounds. Methane desorption takes places mainly in two temperature regimes centered at around 350 and 500 K. Predosing of oxygen appears to significantly enhance the high-temperature methane production at the expense of the one at low temperatures. In addition, an upward shift is seen in the desorption temperatures of methane, ethylene and hydrogen in the presence of coadsorbed oxygen. Finally, the coupling mechanism for the formation of ethylene was investigated by using isotope labeling and also comparing the TPD spectra of several probing molecules. Our results indicated that -CH2O- and -CH2- are the most likely intermediates.