J. Kuppers, INTERACTIONS OF GASEOUS H-ATOMS WITH ADSORBATE COVERED SURFACES VIA ELEY-RIDEAL REACTIONS, Zeitschrift für physikalische Chemie, 197, 1996, pp. 137-153
Citations number
21
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Reactions of gaseous H atoms with adsorbates at surfaces of solids hav
e found a growing interest. From the reaction cross sections measured
in many studies, only in the Angstrom(2) range, it is apparent that El
ey-Rideal type mechanisms, in which the H atom is not accommodated at
the surface but reacts on impact close to the adsorbed reaction partne
r, is the appropriate description of these processes. The phenomology
of H atom impact induced reactions with adsorbates is rather simple an
d can be separated into abstraction and hydrogenation routes. Several
examples of Eley-Rideal reactions are discussed here: abstraction of H
and O adsorbed at Ni(100) surfaces, hydrogenation of and abstraction
from physisorbed hydrocarbon molecules, benzene, dimethyl-cyclohexane,
p-xylene, and i-propanol. It is shown that in addition to the reactio
n energy the existence of favorable intermediates determine the probab
ilities or cross sections of reaction routes.