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Kwak, Ja Hun
Molecular Catalysis lab
Research Interests
  • Heterogeneous catalysis, molecular catalysis, ASlumima, zeolites

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Using a Surface-Sensitive Chemical Probe and a Bulk Structure Technique to Monitor the gamma- to theta-Al2O3 Phase Transformation

DC Field Value Language
dc.contributor.author Kwak, Ja Hun -
dc.contributor.author Peden, Charles H. F. -
dc.contributor.author Szanyi, Janos -
dc.date.accessioned 2015-10-26T02:52:11Z -
dc.date.available 2015-10-26T02:52:11Z -
dc.date.created 2015-07-21 -
dc.date.issued 2011-06 -
dc.identifier.citation JOURNAL OF PHYSICAL CHEMISTRY C, v.115, no.25, pp.12575 - 12579 -
dc.identifier.issn 1932-7447 -
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/17569 -
dc.description.abstract In this work, we investigated the phase transformation of gamma-Al2O3 to theta-Al2O3 by ethanol TPD and XRD. Ethanol TPD showed remarkable sensitivity toward the surface structures of the aluminas studied. Maximum desorption rates for the primary product of ethanol adsorption, ethylene, were observed at 225, 245, and 320 degrees C over gamma-, theta-, and alpha-Al2O3, respectively. Ethanol TPD over a gamma-Al2O3 sample calcined at 800 degrees C clearly shows that the surface of the resulting material possesses theta-alumina characteristics, even though only the gamma-alumina phase was detected by XRD. These results strongly suggest that the gamma-to-theta phase transformation of alumina initiates at oxide particle surfaces. The results obtained are also consistent with our previous finding that the presence of penta-coordinated Al3+ sites, formed on the (100) facets of the alumina surface, is strongly correlated with the thermal stability of gamma-alumina -
dc.description.statementofresponsibility open -
dc.language ENG -
dc.publisher AMER CHEMICAL SOC -
dc.subject UV RAMAN-SPECTROSCOPY -
dc.subject PENTACOORDINATED AL3+ IONS -
dc.subject THERMAL EVOLUTION -
dc.subject ALUMINA SURFACES -
dc.subject NANOPARTICLES -
dc.subject TEMPERATURE -
dc.subject GAMMA-AL2O3 -
dc.subject MORPHOLOGY -
dc.subject TIO2 -
dc.subject AREA -
dc.title Using a Surface-Sensitive Chemical Probe and a Bulk Structure Technique to Monitor the gamma- to theta-Al2O3 Phase Transformation -
dc.type ARTICLE -
dc.identifier.scopusid 2-s2.0-79959520275 -
dc.identifier.wosid 000291896000043 -
dc.type.rims ART -
dc.description.wostc 14 *
dc.description.scopustc 12 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1021/jp203541a -
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