Intrinsic Relation between Catalytic Activity of CO Oxidation on Ru Nanoparticles and Stability of Ru Oxides Uncovered with Ambient Pressure XPS

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dc.contributor.authorKamran Qadir-
dc.contributor.authorJoo, Sang Hoon-
dc.contributor.authorMun, Bongjin S.-
dc.contributor.authorDerek R. Butcher-
dc.contributor.authorRuss J. Renzas-
dc.contributor.authorFunda Aksoy-
dc.contributor.authorZhi Liu-
dc.contributor.authorGabor A. Somorjai-
dc.contributor.authorPark, JeongYoung-
dc.date.accessioned2013-03-29T14:11:36Z-
dc.date.available2013-03-29T14:11:36Z-
dc.date.created2012-08-13-
dc.date.issued2012-04-26-
dc.identifier.citation학회 창립 60주년 기념 2012년 봄 학술논문 발표회-
dc.identifier.urihttp://hdl.handle.net/10203/171278-
dc.description.abstractRecent progress in controlled shape and sizes of nanoparticles using colloidal synthesis technique together with development of in-situ surface science characterization tools such as ambient pressure X-ray photoelectron spectroscopy (AP-XPS) has resulted in enhanced understanding of surface structure of working catalysts. We report AP-XPS study of Ru nanoparticles to monitor surface oxidation states under oxidizing, reducing and CO oxidation reaction conditions. Ru 2.8 and 6 nm nanoparticles were synthesized in the presence of poly(vinyl pyrrolidone) and deposited onto Si wafers by Langmuir-Blodgett deposition as model catalysts. It was found that Ru nanoparticle exhibited mild oxidative and reductive characters, suggesting presence of an oxide overlayer around metallic core. AP-XPS showed that such oxide formation is dependent on Ru nanoparticle size and we found higher oxide formation for Ru 6 nm nanoparticles at all temperatures. The catalytic activity of Ru nanoparticles increases as increasing nanoparticle size in the range of 2 – 6 nm. We suggest that enhancement in catalytic activity for larger nanoparticles are attributed to a stable surface oxide of core-shell nanoparticles. Such in-situ observations of Ru nanoparticles are useful in identifying active state of the catalysts during use and hence may allow for rational catalysts design for practical application.-
dc.languageEnglish-
dc.publisher한국물리학회-
dc.titleIntrinsic Relation between Catalytic Activity of CO Oxidation on Ru Nanoparticles and Stability of Ru Oxides Uncovered with Ambient Pressure XPS-
dc.typeConference-
dc.type.rimsCONF-
dc.citation.publicationname학회 창립 60주년 기념 2012년 봄 학술논문 발표회-
dc.identifier.conferencecountryKO-
dc.identifier.conferencelocation대전컨벤션센터-
dc.contributor.localauthorPark, JeongYoung-
dc.contributor.nonIdAuthorKamran Qadir-
dc.contributor.nonIdAuthorJoo, Sang Hoon-
dc.contributor.nonIdAuthorMun, Bongjin S.-
dc.contributor.nonIdAuthorDerek R. Butcher-
dc.contributor.nonIdAuthorRuss J. Renzas-
dc.contributor.nonIdAuthorFunda Aksoy-
dc.contributor.nonIdAuthorZhi Liu-
dc.contributor.nonIdAuthorGabor A. Somorjai-

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