DC Field | Value | Language |
---|---|---|
dc.contributor.author | Rioux, RM | ko |
dc.contributor.author | Song, Hyunjoon | ko |
dc.contributor.author | Hoefelmeyer, JD | ko |
dc.contributor.author | Yang, P | ko |
dc.contributor.author | Somorjai, GA | ko |
dc.date.accessioned | 2010-12-07 | - |
dc.date.available | 2010-12-07 | - |
dc.date.created | 2012-02-06 | - |
dc.date.created | 2012-02-06 | - |
dc.date.issued | 2005-02 | - |
dc.identifier.citation | JOURNAL OF PHYSICAL CHEMISTRY B, v.109, no.6, pp.2192 - 2202 | - |
dc.identifier.issn | 1520-6106 | - |
dc.identifier.uri | http://hdl.handle.net/10203/20782 | - |
dc.description.abstract | Platinum nanoparticles in the size range of 1.7-7.1 nm were produced by alcohol reduction methods. A polymer (poly (vinylpyrrolidone), PVP) was used to stabilize the particles by capping them in aqueous solution. The particles were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). TEM investigations demonstrate that the particles have a narrow size distribution. Mesoporous SBA-15 silica with 9-nm pores was synthesized by a hydrothermal process and used as a catalyst support. After incorporation into mesoporous SBA-15 silica using low-power sonication, the catalysts were calcined to remove the stabilizing polymer from the nanoparticle surface and reduced by H-2. Pt particle sizes determined from selective gas adsorption measurements are larger than those determined by bulk techniques such as XRD and TEM. Roomtemperature ethylene hydrogenation was chosen as a model reaction to probe the activity of the Pt/SBA-15 materials. The reaction was shown to be structure insensitive over a series of Pt/SBA-15 materials with particle sizes between 1.7 and 3.6 nm. The hydrogenolysis of ethane on Pt particles from 1.7 to 7.1 nm was weakly structure sensitive with smaller particles demonstrating higher specific activity. Turnover rates for ethane hydrogenolysis increased monotonically with increasing metal dispersion, suggesting that coordinatively unsaturated metal atoms present in small particles are more active for C2H6 hydrogenolysis than the low index planes that dominate in large particles. An explanation for the structure sensitivity is suggested, and the potential applications of these novel supported nanocatalysts for further studies of structure-activity and structure-selectivity relationships are discussed. | - |
dc.description.sponsorship | This work is supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials and Chemical Sciences Divisions of the U. S. Department of Energy under Contract DE-AC03-76SF00098. We thank Professor M. A. Vannice of the Pennsylvania State University for the 3.2% Pt/SiO2-IE material and Samrat Mukherjee for preparation of the material. R.M.R. acknowledges the Ford Motor Company and the Berkeley Catalysis Center for financial support. H.S. thanks the Korea Science and Engineering Foundation (KOSEF) for support under the Postdoctoral Fellowship Program. | en |
dc.language | English | - |
dc.language.iso | en_US | en |
dc.publisher | AMER CHEMICAL SOC | - |
dc.subject | SINGLE-CRYSTAL SURFACES | - |
dc.subject | ETHANE HYDROGENOLYSIS | - |
dc.subject | ETHYLENE HYDROGENATION | - |
dc.subject | SUPPORTED PLATINUM | - |
dc.subject | METAL FILMS | - |
dc.subject | KINETICS | - |
dc.subject | SITES | - |
dc.subject | CLUSTERS | - |
dc.subject | PT(111) | - |
dc.subject | SIZE | - |
dc.title | High-surface-area catalyst design: Synthesis, characterization, and reaction studies of platinum nanoparticles in mesoporous SBA-15 silica | - |
dc.type | Article | - |
dc.identifier.wosid | 000226956300019 | - |
dc.identifier.scopusid | 2-s2.0-14544268511 | - |
dc.type.rims | ART | - |
dc.citation.volume | 109 | - |
dc.citation.issue | 6 | - |
dc.citation.beginningpage | 2192 | - |
dc.citation.endingpage | 2202 | - |
dc.citation.publicationname | JOURNAL OF PHYSICAL CHEMISTRY B | - |
dc.identifier.doi | 10.1021/jp048867x | - |
dc.embargo.liftdate | 9999-12-31 | - |
dc.embargo.terms | 9999-12-31 | - |
dc.contributor.localauthor | Song, Hyunjoon | - |
dc.contributor.nonIdAuthor | Rioux, RM | - |
dc.contributor.nonIdAuthor | Hoefelmeyer, JD | - |
dc.contributor.nonIdAuthor | Yang, P | - |
dc.contributor.nonIdAuthor | Somorjai, GA | - |
dc.type.journalArticle | Article | - |
dc.subject.keywordPlus | SINGLE-CRYSTAL SURFACES | - |
dc.subject.keywordPlus | ETHANE HYDROGENOLYSIS | - |
dc.subject.keywordPlus | ETHYLENE HYDROGENATION | - |
dc.subject.keywordPlus | SUPPORTED PLATINUM | - |
dc.subject.keywordPlus | METAL FILMS | - |
dc.subject.keywordPlus | KINETICS | - |
dc.subject.keywordPlus | SITES | - |
dc.subject.keywordPlus | CLUSTERS | - |
dc.subject.keywordPlus | PT(111) | - |
dc.subject.keywordPlus | SIZE | - |
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