Abstract
Platinum clusters were prepared by ion exchange of a KL zeolite, followed by oxygen calcination and hydrogen reduction, and characterized by electron paramagnetic resonance (EPR) and hyperfine sublevel correlation experiment (HYSCORE) spectroscopy. Simulations indicate that the cluster contains 12 equivalent platinum atoms. Therefore, the most likely structure is an icosahedral or cuboctahedral magic number Pt13 cluster with 12 platinum atoms at the surface. One atom in the center possesses only a small spin density. H/D desorption and readsorption experiments monitored via EPR and HYSCORE measurements provide information about the structure of the clusters and about the reversibility of the adsorption/desorption and isotope exchange process. Deuterium desorption experiments result in a value of 2.1 ± 0.2 eV for the D2 desorption energy of the Pt13 clusters dispersed in KL zeolite. This is more than double of the value for a (111) Pt single-crystal surface, revealing a finite size and/or support effect. O...
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.
