Abstract
CO adsorption at Pd(112) has been studied by means of Fourier-transform infrared reflection absorption spectroscopy and temperature programmed desorption (TPD) at 120 K. Pd(112) exhibits terraces of hexagonal closed packed palladium atoms ((111) orientation) with a width of three atoms and monoatomic steps of (100) orientation. In real catalysts consisting of nanocrystalline palladium particles on oxidic supports neighbouring facets of (111) and (100) orientation may be found. Pd(112) therefore is an ideal system to study the role of step sites in catalysis in a defined way without having to deal with further complications such as size effects and nanoparticle-support interaction. CO adsorbs initially at step sites before populating terrace sites. CO 2 formation observed in TPD experiments indicates that CO dissociation occurs at low coverage at 120 K at the step sites. This is the first report on CO dissociation at a palladium surface. Further, this finding is in surprising contrast to literature data on CO adsorption at 300 K for which no CO dissociation has been reported. The literature data were confirmed by own experiments at 300 K and will be compared to 120 K data.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
