AVS 46th International Symposium
    Surface Science Division Tuesday Sessions
       Session SS-TuP

Paper SS-TuP10
Adsorption and Thermal Decomposition of 1,3-butadiene and 2-butyne on Ru(001)

Tuesday, October 26, 1999, 5:30 pm, Room 4C

Session: Poster Session
Presenter: M.J. Weiss, University of California, Santa Barbara
Authors: M.J. Weiss, University of California, Santa Barbara
C.J. Hagedorn, University of California, Santa Barbara
W.H. Weinberg, University of California, Santa Barbara
Correspondent: Click to Email
The low temperature (80 K) molecular adsorption and subsequent thermal decomposition of 1,3-butadiene and 2-butyne are studied on Ru(001) using temperature programmed desorption and high resolution electron energy loss spectroscopy (HREELS). After heating to 300 K, the 1,3-butadiene decomposes to yield a (CH)@sub 4@ surface metallacycle. This result is particularly interesting in that the (CH)@sub 4@ species has been implicated as an intermediate in the production of 1,3-butadiene (and other molecules) during thiophene hydrodesulfurization. 2-butyne adsorbs at a coverage of 0.27 molecules for every surface ruthenium atom, a coverage which is equal to that observed for the adsorption of acetylene on this surface. The 2-butyne decomposes to yield surface hydrocarbon fragments whose HREEL spectra resemble those of vinylidene, acetylide, and methylidyne. Slight differences in the spectra, however, suggest that the fragments observed in the present work may actual be analogous species containing four carbon atoms.