{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/23785"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/23785","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Nuclear magnetic resonance studies of simple molecules on metal surfaces","abstract":"We have used NMR to study the structure and reactions of acetylene and ethylene adsorbed on small catalyst particles. By monitoring $\\sp{13}$C-$\\sp{13}$C and $\\sp{13}$C-$\\sp1$H dipolar couplings we found the carbon-carbon bond length to be 1.44 $\\pm$ 0.02A for acetylene adsorbed on Rh clusters at room temperature and the surface species to consist mostly of CCH$\\sb2$ with a small amount of CCH. Using $\\sp2$H NMR we studied the conversion of ethylene adsorbed at low temperatures on Pt clusters to the stable room temperature species (CCH$\\sb3$) and also the hydrogen-deuterium exchange in this CCH$\\sb3$ species. We found an activation energy of 15.2 $\\pm$ 2.0 kcal/mole and preexponential factor of 10$\\sp{7{\\pm}1.7}$ sec$\\sp{-1}$ for the conversion reaction and an activation energy of 14.3 $\\pm$ 2.5 kcal/mole and preexponential factor of 4 $\\times$ 10$\\sp{7{\\pm}2}$ sec$\\sp{-1}$ for the exchange reaction. We compare these results with those obtained by other researchers. We also studied the formation of CCH$\\sb3$ from the stable room temperature species of acetylene adsorbed on Pt (CCH$\\sb2$) and found an activation energy of 9.3 $\\pm$ 2.5 kcal/mole and a preexponential factor of 10$\\sp{3{\\pm}2}$ sec$\\sp{-1}$torr$\\sp{-1}$. In addition, we used measurements of $\\sp{13}$C-$\\sp1$H dipolar couplings to monitor the hydrogen population for the surface species formed from acetylene adsorbed on Pt and Ir. We were able to show that the CCH$\\sb2$ species do not lose hydrogen prior to carbon-carbon bond scission on Ir but that there is a gradual dehydrogenation below the temperature of carbon-carbon bond scission for CCH$\\sb2$ species on Pt.","abstract_html":"We have used NMR to study the structure and reactions of acetylene and ethylene adsorbed on small catalyst particles. By monitoring $\\sp{13}$C-$\\sp{13}$C and $\\sp{13}$C-$\\sp1$H dipolar couplings we found the carbon-carbon bond length to be 1.44 $\\pm$ 0.02A for acetylene adsorbed on Rh clusters at room temperature and the surface species to consist mostly of CCH$\\sb2$ with a small amount of CCH. Using $\\sp2$H NMR we studied the conversion of ethylene adsorbed at low temperatures on Pt clusters to the stable room temperature species (CCH$\\sb3$) and also the hydrogen-deuterium exchange in this CCH$\\sb3$ species. We found an activation energy of 15.2 $\\pm$ 2.0 kcal/mole and preexponential factor of 10$\\sp{7{\\pm}1.7}$ sec$\\sp{-1}$ for the conversion reaction and an activation energy of 14.3 $\\pm$ 2.5 kcal/mole and preexponential factor of 4 $\\times$ 10$\\sp{7{\\pm}2}$ sec$\\sp{-1}$ for the exchange reaction. We compare these results with those obtained by other researchers. We also studied the formation of CCH$\\sb3$ from the stable room temperature species of acetylene adsorbed on Pt (CCH$\\sb2$) and found an activation energy of 9.3 $\\pm$ 2.5 kcal/mole and a preexponential factor of 10$\\sp{3{\\pm}2}$ sec$\\sp{-1}$torr$\\sp{-1}$. In addition, we used measurements of $\\sp{13}$C-$\\sp1$H dipolar couplings to monitor the hydrogen population for the surface species formed from acetylene adsorbed on Pt and Ir. We were able to show that the CCH$\\sb2$ species do not lose hydrogen prior to carbon-carbon bond scission on Ir but that there is a gradual dehydrogenation below the temperature of carbon-carbon bond scission for CCH$\\sb2$ species on Pt.","abstract_has_math":true,"creators":["Klug, Christopher Aaron"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics, Condensed Matter","degree_department":null,"school":null,"contributors":["Slichter, C.P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2011,"date_issued":"2011-05-07T14:26:58Z","date_published":"2011-05-07T14:26:58Z","updated_at":"2026-07-22T22:25:22Z","subjects":["Physics, Condensed Matter"],"languages":["eng"],"rights":["Copyright 1990 Klug, Christopher Aaron"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9114301","(UMI)AAI9114301"],"render_values":[{"text":"AAI9114301","href":null,"code":true},{"text":"(UMI)AAI9114301","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/23785","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Slichter, C.P."]},{"key":"dc:creator","label":"Author","values":["Klug, Christopher Aaron"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2011-05-07T14:26:58Z","10000-01-01","1990"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics, Condensed Matter"]},{"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"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 1990 Klug, Christopher Aaron"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["AAI9114301","(UMI)AAI9114301","http://hdl.handle.net/2142/23785"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["We have used NMR to study the structure and reactions of acetylene and ethylene adsorbed on small catalyst particles. By monitoring $\\sp{13}$C-$\\sp{13}$C and $\\sp{13}$C-$\\sp1$H dipolar couplings we found the carbon-carbon bond length to be 1.44 $\\pm$ 0.02A for acetylene adsorbed on Rh clusters at room temperature and the surface species to consist mostly of CCH$\\sb2$ with a small amount of CCH. Using $\\sp2$H NMR we studied the conversion of ethylene adsorbed at low temperatures on Pt clusters to the stable room temperature species (CCH$\\sb3$) and also the hydrogen-deuterium exchange in this CCH$\\sb3$ species. We found an activation energy of 15.2 $\\pm$ 2.0 kcal/mole and preexponential factor of 10$\\sp{7{\\pm}1.7}$ sec$\\sp{-1}$ for the conversion reaction and an activation energy of 14.3 $\\pm$ 2.5 kcal/mole and preexponential factor of 4 $\\times$ 10$\\sp{7{\\pm}2}$ sec$\\sp{-1}$ for the exchange reaction. We compare these results with those obtained by other researchers. We also studied the formation of CCH$\\sb3$ from the stable room temperature species of acetylene adsorbed on Pt (CCH$\\sb2$) and found an activation energy of 9.3 $\\pm$ 2.5 kcal/mole and a preexponential factor of 10$\\sp{3{\\pm}2}$ sec$\\sp{-1}$torr$\\sp{-1}$. In addition, we used measurements of $\\sp{13}$C-$\\sp1$H dipolar couplings to monitor the hydrogen population for the surface species formed from acetylene adsorbed on Pt and Ir. We were able to show that the CCH$\\sb2$ species do not lose hydrogen prior to carbon-carbon bond scission on Ir but that there is a gradual dehydrogenation below the temperature of carbon-carbon bond scission for CCH$\\sb2$ species on Pt.","Made available in DSpace on 2011-05-07T14:26:58Z (GMT). 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By monitoring $\\sp{13}$C-$\\sp{13}$C and $\\sp{13}$C-$\\sp1$H dipolar couplings we found the carbon-carbon bond length to be 1.44 $\\pm$ 0.02A for acetylene adsorbed on Rh clusters at room temperature and the surface species to consist mostly of CCH$\\sb2$ with a small amount of CCH. Using $\\sp2$H NMR we studied the conversion of ethylene adsorbed at low temperatures on Pt clusters to the stable room temperature species (CCH$\\sb3$) and also the hydrogen-deuterium exchange in this CCH$\\sb3$ species. We found an activation energy of 15.2 $\\pm$ 2.0 kcal/mole and preexponential factor of 10$\\sp{7{\\pm}1.7}$ sec$\\sp{-1}$ for the conversion reaction and an activation energy of 14.3 $\\pm$ 2.5 kcal/mole and preexponential factor of 4 $\\times$ 10$\\sp{7{\\pm}2}$ sec$\\sp{-1}$ for the exchange reaction. We compare these results with those obtained by other researchers. We also studied the formation of CCH$\\sb3$ from the stable room temperature species of acetylene adsorbed on Pt (CCH$\\sb2$) and found an activation energy of 9.3 $\\pm$ 2.5 kcal/mole and a preexponential factor of 10$\\sp{3{\\pm}2}$ sec$\\sp{-1}$torr$\\sp{-1}$. In addition, we used measurements of $\\sp{13}$C-$\\sp1$H dipolar couplings to monitor the hydrogen population for the surface species formed from acetylene adsorbed on Pt and Ir. We were able to show that the CCH$\\sb2$ species do not lose hydrogen prior to carbon-carbon bond scission on Ir but that there is a gradual dehydrogenation below the temperature of carbon-carbon bond scission for CCH$\\sb2$ species on Pt.","Made available in DSpace on 2011-05-07T14:26:58Z (GMT). No. of bitstreams: 2 license.txt: 4922 bytes, checksum: 910b249b4beec47e7ab768910c8f966f (MD5) 9114301.pdf: 5961827 bytes, checksum: 906a743522fd4f2f58d7c4ef0b7e5299 (MD5) Previous issue date: 1990","Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Howard Ding (hding2@illinois.edu) on 2011-05-07T15:06:50Z Item is restricted indefinitely.","Restriction data tranferred 2014-07-01T11:32:06-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: ETDs are only available to UIUC Users without author permission","ETDs are only available to UIUC Users without author permission","U of I Only"],"dc:identifier":["AAI9114301","(UMI)AAI9114301","http://hdl.handle.net/2142/23785"],"dc:language":["eng"],"dc:rights":["Copyright 1990 Klug, Christopher Aaron"],"dc:subject":["Physics, Condensed Matter"],"dc:title":["Nuclear magnetic resonance studies of simple molecules on metal surfaces"],"dc:type":["text"],"thesis:degree_discipline":["Physics, Condensed Matter"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:22Z"}