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1,2-Dichloroethene on Cu(1 1 0): Adsorption, dechlorination and trimerisation reactions
Ist Teil von
Journal of molecular catalysis. A, Chemical, 2009-06, Vol.305 (1), p.117-120
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2009
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Adsorption and reactions of
cis-1,2-dichloroethene on Cu(1
1
0) can be described in terms of three main regimes: I (<150
K) intact molecular adsorption; II (155–280
K) desorption/dechlorination; and finally, III (>280–450
K) trimerisation of the acetylene intermediate at the surface to form benzene which desorbs above 350
K. Although the related positions of the Cl atoms force different adsorption geometries for
cis- and
trans-1,2-dichloroethene, the behaviour of the two compounds is similar. No isomerisation between the
cis and
trans isomers was seen.
The adsorption and reactions of
cis-1,2-dichloroethene on Cu(1
1
0) have been investigated using Reflection Absorption Infrared Spectroscopy, Temperature Programmed Desorption and Molecular Beam Adsorption Reaction Spectroscopy, and the behaviour compared with that of the previously studied [S. Haq, S.C. Laroze, C. Mitchell, N. Winterton, R. Raval, Surf. Sci. 531 (2003) 145]
trans isomer. No isomerisation between the
cis and
trans isomers was seen. The data reveal that, although the related positions of the Cl atoms force different adsorption geometries for the two isomers, the behaviour of both compounds follows a very similar general reaction pathway which is critically temperature-dependent and can be described in terms of three main regimes: Regime I occurring at low temperatures in which intact molecular adsorption occurs; Regime II, extending over the temperature range of 155–280
K, in which desorption/dechlorination events are triggered; and, finally, Regime III, over 280–450
K, is governed, for both isomers, by the behaviour of the acetylene intermediate at the surface which trimerises to form benzene and desorbs above 350
K.