The effects of pressure and temperature on the interaction of CO and H2 on Pd(110)

Abstract

TPD was used to study the coadsorption of CO and H2 on Pd(110) at hydrogen pressure in the range of 10−7–10−6 Torr at 200 K. It was found that large exposures of hydrogen make the β-H peak shift towards temperature below 300 K. Both adsorbed and dissolved hydrogen atoms were detected even on a surface presaturated with CO. These observations were interpreted as the existence of a surface intermediate of CO-H under gas ambiance which proceeds the penetration of hydrogen into the bulk.