IUVSTA 15th International Vacuum Congress (IVC-15), AVS 48th International Symposium (AVS-48), 11th International Conference on Solid Surfaces (ICSS-11)
    Surface Science Thursday Sessions
       Session SS3-ThP

Paper SS3-ThP10
Thermal Chemistry of cis-1,2-Dichloroethene on Pd(111)

Thursday, November 1, 2001, 5:30 pm, Room 134/135

Session: Surface Reactions Poster Session
Presenter: D.M. Jaramillo, University of California, Davis
Authors: D.M. Jaramillo, University of California, Davis
D.E. Hunka, University of California, Davis
D.P. Land, University of California, Davis
Correspondent: Click to Email
The decomposition of halogenated compounds on metal surfaces has generated significant interest due to the facile remediation of halocarbons by metal particles. Of particular importance are the reactions of toxic and/or carcinogenic compounds, such as chloroethenes. We have elucidated some mechanistic information about the decomposition of cis-1,2-dichloroethene on palladium. After adsorption on Pd(111) at 100 K, cis-1,2-dichloroethene thermally decomposed by 400 K to yield chlorine and hydrocarbon fragments. The only decomposition products observed by temperature programmed desorption (TPD) and laser-induced thermal desorption (LITD) were hydrogen chloride and hydrogen. Very little HCl was formed on the surface and only for exposures above 0.3 L. However, the presence of chlorine, observed by Auger electron spectroscopy (AES), on the surface above 650 K for exposures below 0.4 L indicates that decomposition occurred even though no HCl was observed. Possible surface intermediates were identified using Fourier transform reflection-adsorption infrared spectroscopy (FT-RAIRS).