Affordable Access

Publisher Website

Adsorption and oxidation of C2N2on clean and oxygen dosed Rh(111) surfaces

Authors
Journal
Surface Science
0039-6028
Publisher
Elsevier
Publication Date
Volume
147
Identifiers
DOI: 10.1016/0039-6028(84)90478-3

Abstract

Abstract The interaction of C 2N 2 with Rh surfaces has been investigated by LEED, Auger electron, electron energy loss (in the electronic range) and thermal desorption spectroscopy. The adsorption of C 2N 2 on a clean Rh(111) surface at 300 K did not give rise to any new LEED pattern. By means of thermal desorption measurements four adsorption states were distinguished at saturation; at 380 K (α), 610 K (β 1), 680 K (β 2) and 740 K (γ). The weakly bound α state is attributed to non-dissociatively adsorbed C 2N 2, while the β and γ states are ascribed to the associative desorption of pairs of CN radicals formed in the surface dissociation of C 2N 2. At the same time, N 2 also desorbed, at T p = 800 and 850 K, indicating that fission of the C− N bond occurred on the Rh(111) surface. In the presence of adsorbed oxygen the rate and the extent of C 2N 2 adsorption are decreased. The oxidation of adsorbed CN groups starts above 360 K, to yield gaseous CO 2 and adsorbed CO and N. From the EELS results it is proposed that the oxidation of cyanide occurs through the formation and further oxidation of an NCO surface intermediate.

There are no comments yet on this publication. Be the first to share your thoughts.