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An, Kwangjin
Advanced Nanocatalysis Lab (An Lab)
Research Interests
  • Nanoparticle catalytsts, catalytic activity, selectivity, and stability, strong metal-support interactions, CO2 utilization, biomass conversion, Plastic Up-cycling


Designed Catalysts from Pt Nanoparticles Supported on Macroporous Oxides for Selective Isomerization of n-Hexane

DC Field Value Language An, Kwangjin ko S Alayoglu ko N Musselwhite ko K Na ko GA Somorjai ko 2015-07-29T00:54:05Z - 2015-07-28 ko 2014-04 -
dc.identifier.citation JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.136, no.19, pp.6830 - 6833 ko
dc.identifier.issn 0002-7863 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract Selective isomerization toward branched hydrocarbons is an important catalytic process in oil refining to obtain high-octane gasoline with minimal content of aromatic compounds. Colloidal Pt nanoparticles with controlled sizes of 1.7, 2.7, and 5.5 nm were deposited onto ordered macroporous oxides of SiO2, Al2O3, TiO2, Nb2O5, Ta2O5, and ZrO2 to investigate Pt size- and support-dependent catalytic selectivity in n-hexane isomerization. Among the macroporous oxides, Nb2O5 and Ta2O5 exhibited the highest product selectivity, yielding predominantly branched C-6 isomers, including 2- or 3-methylpentane, as desired products of n-hexane isomerization (140 Torr n-hexane and 620 Torr H-2 at 360 degrees C). In situ characterizations including X-ray diffraction and ambient-pressure X-ray photoelectron spectroscopy showed that the crystal structures of the oxides in Pt/oxide catalysts were not changed during the reaction and oxidation states of Nb2O5 were maintained under both H-2 and O-2 conditions. Fourier transform infrared spectra of pyridine adsorbed on the oxides showed that Lewis sites were the dominant acidic site of the oxides. Macroporous Nb2O5 and Ta2O5 were identified to play key roles in the selective isomerization by charge transfer at Pt-oxide interfaces. The selectivity was revealed to be Pt size-dependent, with improved isomer production as Pt sizes increased from 1.7 to 5.5 nm. When 5.5 nm Pt nanoparticles were supported on Nb2O5 or Ta2O5, the selectivity toward branched C-6 isomers was further increased, reaching ca. 97% with a minimum content of benzene, due to the combined effects of the Pt size and the strong metal-support interaction. ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher AMER CHEMICAL SOC ko
dc.subject Catalysts ko
dc.subject Gasoline refining ko
dc.subject Hexane ko
dc.subject Hydrocarbon refining ko
dc.subject Isomerization ko
dc.subject Isomers ko
dc.subject Nanoparticles ko
dc.subject Niobium ko
dc.subject Photoelectrons ko
dc.subject Platinum ko
dc.subject Tantalum ko
dc.subject Tantalum oxides ko
dc.subject X ray diffraction ko
dc.subject X ray photoelectron spectroscopy ko
dc.title Designed Catalysts from Pt Nanoparticles Supported on Macroporous Oxides for Selective Isomerization of n-Hexane ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84900821575 ko
dc.identifier.wosid 000336078400014 ko
dc.type.rims ART ko
dc.description.wostc 14 *
dc.description.scopustc 11 * 2015-12-28 * 2015-11-04 *
dc.identifier.doi 10.1021/ja5018656 ko
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