TPD, scanning tunneling microscopy, and HREELS were used to study the selective partial hydrogenation of C4H6 to C4H8 on hydrogen-precovered Pd(110). The effective partial hydrogenation of C4H6 on the Pd(110) surface was realized due to the high hydrogenation activity of weakly π-bonded C4H6 combined with the instability of C4H8 produced at the reaction temperature. C4H6 hydrogenation did not take place in the sparse domains of < 0.25 ML, in which C4H6 was in a strongly π-bounded state. C4H6 formed dense domains and turned into a weakly π-bonded state in these dense domains on increasing C4H6 coverage. Only the weakly π-bonded C4H6 was hydrogenated to C4H8 at about 200 K. In contrast, the produced C4H8 was not stabilized on the surface above 200 K because C4H8 preferred to desorb at the temperature it was produced or was dehydrogenated to C4H6 when any part of the C4H8 remained on the Pd surface.
|Number of pages||4|
|Journal||Journal of Physical Chemistry B|
|Publication status||Published - 2003 Apr 24|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
- Materials Chemistry