Nuclear Magnetic Resonance Study of the Platinum - Rhodium Bimetallic Clusters

We report the study of supported Pt-Rh bimetallic catalysts by $\sp{195}$Pt NMR and by $\sp $C NMR of adsorbed CO. The metal particles are 5A-50A in diameter. Study of the dependence of the $\sp $CO resonance position as a function of Pt/Rh ratio and particle size shows that Rh is segregated to the surface. Study of the $\sp{195}$Pt NMR shows that the center of the particles consists of Pt only. By $\sp{195}$Pt-$\sp $CO double resonance we measure CO frequencies for those CO molecules which are bonded to Pt. We found thereby that the electronic structure of the bimetallic particle surfaces probed by CO NMR is independent of whether CO is bonded to Pt or Rh.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Grantor

University of Illinois at Urbana-Champaign

Year dc:date

2015

Author dc:creator

• Wang, Zhiyue

• Physics, Condensed Matter

Language dc:language

eng

Identifier

(UMI)AAI8721781

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/77410