{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/77410"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/77410","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nuclear Magnetic Resonance Study of the Platinum - Rhodium Bimetallic Clusters","abstract":"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.","abstract_html":"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.","abstract_has_math":true,"creators":["Wang, Zhiyue"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-05-13T15:41:57Z","date_published":"2015-05-13T15:41:57Z","updated_at":"2026-07-22T22:26:10Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(UMI)AAI8721781"],"render_values":[{"text":"(UMI)AAI8721781","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/77410","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Wang, Zhiyue"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-05-13T15:41:57Z","10000-01-01","1987"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Physics, Condensed Matter"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/77410","(UMI)AAI8721781"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["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.","Made available in DSpace on 2015-05-13T15:41:57Z (GMT). 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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.","Made available in DSpace on 2015-05-13T15:41:57Z (GMT). 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