There are no files associated with this item.
Full metadata record
DC Field | Value | Language |
---|---|---|
dc.citation.endPage | 4912 | - |
dc.citation.number | 8 | - |
dc.citation.startPage | 4907 | - |
dc.citation.title | NANO LETTERS | - |
dc.citation.volume | 14 | - |
dc.contributor.author | An, Kwangjin | - |
dc.contributor.author | Zhang, Qiao | - |
dc.contributor.author | Alayoglu, Selim | - |
dc.contributor.author | Musselwhite, Nathan | - |
dc.contributor.author | Shin, Jae-Youn | - |
dc.contributor.author | Somorjai, Gabor A. | - |
dc.date.accessioned | 2023-12-22T02:36:37Z | - |
dc.date.available | 2023-12-22T02:36:37Z | - |
dc.date.created | 2015-07-28 | - |
dc.date.issued | 2014-07 | - |
dc.description.abstract | Designing catalysts with high thermal stability and resistance to deactivation while simultaneously maintaining their catalytic activity and selectivity is of key importance in high-temperature reforming reactions. We prepared Pt nanoparticle catalysts supported on either mesoporous SiO2 or TiO2. Sandwich-type Pt core@shell catalysts (SiO2@Pt@SiO2 and SiO2@Pt@TiO2) were also synthesized from Pt nanoparticles deposited on SiO2 spheres, which were encapsulated by either mesoporous SiO2 or TiO2 shells. n-Hexane reforming was carried out over these four catalysts at 240-500 degrees C with a hexane/H-2 ratio of 1:5 to investigate thermal stability and the role of the support. For the production of high-octane gasoline, branched C-6 isomers are more highly desired than other cyclic, aromatic, and cracking products. Over Pt/TiO2 catalyst, production of 2-methylpentane and 3-methylpentane via isomerization was increased selectively up to 420 degrees C by charge transfer at Pt-TiO2 interfaces, as compared to Pt/SiO2. When thermal stability was compared between supported catalysts and sandwich-type core@shell catalysts, the Pt/SiO2 catalyst suffered sintering above 400 degrees C, whereas the SiO2@Pt@SiO2 catalyst preserved the Pt nanoparticle size and shape up to 500 degrees C. The SiO2@Pt@TiO2 catalyst led to Pt nanoparticle sintering due to incomplete protection of the TiO2 shells during the reaction at 500 degrees C. Interestingly, over the Pt/TiO2 catalyst, the average size of Pt nanoparticles was maintained even after 500 degrees C without sintering. In situ ambient pressure X-ray photoelectron spectroscopy demonstrated that the Pt/TiO2 catalyst did not exhibit TiO2 overgrowth on the Pt surface or deactivation by Pt sintering up to 600 degrees C. The extraordinarily high stability of the Pt/TiO2 catalyst promoted high reaction rates (2.0 mu mol.g(-1).s(-1)), which was 8 times greater than other catalysts and high isomer selectivity (53.0% of C-6 isomers at 440 degrees C). By the strong metal-support interaction, the Pt/TiO2 was turned out as the best catalyst with great thermal stability as well as high reaction rate and product selectivity in high-temperature reforming reaction. | - |
dc.identifier.bibliographicCitation | NANO LETTERS, v.14, no.8, pp.4907 - 4912 | - |
dc.identifier.doi | 10.1021/nl502434m | - |
dc.identifier.issn | 1530-6984 | - |
dc.identifier.scopusid | 2-s2.0-84906076231 | - |
dc.identifier.uri | https://scholarworks.unist.ac.kr/handle/201301/12787 | - |
dc.identifier.url | http://pubs.acs.org.library.unist.ac.kr:8010/doi/abs/10.1021/nl502434m | - |
dc.identifier.wosid | 000340446200109 | - |
dc.language | 영어 | - |
dc.publisher | AMER CHEMICAL SOC | - |
dc.title | High-Temperature Catalytic Reforming of n‑Hexane over Supported and Core−Shell Pt Nanoparticle Catalysts: Role of Oxide−Metal Interface and Thermal Stability | - |
dc.type | Article | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.
Tel : 052-217-1404 / Email : scholarworks@unist.ac.kr
Copyright (c) 2023 by UNIST LIBRARY. All rights reserved.
ScholarWorks@UNIST was established as an OAK Project for the National Library of Korea.