An Infrared Spectroscopic and Temperature-programmed Desorption Study of 1,1-Difluoroethylene on Clean and Hydrogen-covered Pd(111)

MAHAPATRA, MAUSUMI; BURKHOLDER, LUKE; CALAZA, FLORENCIA C.; STACCHIOLA, DARIO J.; TYSOE, WILFRED T.

ADSORPTION SCIENCE & TECHNOLOGY

MULTI SCIENCE PUBL CO LTD

Año: 2011 vol. 29 p. 595 - 602

0263-6174

The surface chemistry of 1,1-difluoroethylene was studied on clean and hydrogen-covered Pd(111) using a combination of temperature-programmed desorption and reflection absorption infrared spectroscopy (RAIRS) to explore whether the larger infrared absorbance of 1,1-difluoroethylene than ethylene may be used to examine reactions under realistic catalytic conditions using RAIRS. It was found that the chemistry of 1,1-difluoroethylene on Pd(111) surfaces is similar to that of ethylene with bonding occurring in both the pi- and di-sigma-forms. However, due to the presence of C-F bonds in the molecule, the infrared absorbances for 1,1-difluoroethylene were much larger than those for ethylene. This provides the potential for using RAIRS for in situ studies of catalytic reactions that involve alkenes.