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

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Excellent sulfur resistance of Pt/BaO/CeO(2) lean NO(x) trap catalysts

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dc.contributor.author Kwak, Ja Hun ko
dc.contributor.author Kim, Do Heui ko
dc.contributor.author Szanyi, Janos ko
dc.contributor.author Peden, Charles H. F. ko
dc.date.available 2015-07-23T02:12:29Z -
dc.date.created 2015-07-21 ko
dc.date.issued 2008-12 -
dc.identifier.citation APPLIED CATALYSIS B-ENVIRONMENTAL, v.84, no.3-4, pp.545 - 551 ko
dc.identifier.issn 0926-3373 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12347 -
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0926337308001823 ko
dc.description.abstract In this work, we investigated the NO(x) storage behavior of Pt/BaO/CeO(2) catalysts, especially in the presence of SO(2). High surface area CeO(2) (similar to 110 m(2)/g) with a rod like morphology was synthesized and used as a support. The Pt/BaO/CeO(2) sample demonstrated slightly higher NO(x) uptake in the entire temperature range studied compared with Pt/BaO/gamma-Al(2)O(3). More importantly, this ceria-based catalyst showed higher sulfur tolerance than the alumina-based one. The time of complete NO(x) uptake was maintained even after exposing the sample to similar to 3 g/L of SO(2). The same sulfur exposure, on the other hand, eliminated the complete NO(x) uptake time on the alumina-based NO(x) storage catalysts. TEM images show no evidence of either Pt sintering or BaS phase formation during reductive de-sulfation up to 600 degrees C on the ceria-based catalyst, while the same process over the alumina-based catalyst resulted in both a significant increase in the average Pt cluster size and the agglomeration of a newly formed BaS phase into large crystallites. XPS results revealed the presence of about five times more residual sulfur after reductive de-sulfation at 600 degrees C on the alumina-based catalysts in comparison with the ceria-based ones. All of these results strongly support that, besides their superior intrinsic NO(x) uptake properties, ceria-based catalysts have (a) much higher sulfur tolerance and (b) excellent resistance against Pt sintering when they are compared to the widely used alumina-based catalysts. (C) 2008 Elsevier B.V. All rights reserved ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ELSEVIER SCIENCE BV ko
dc.subject STORAGE-REDUCTION ko
dc.subject PT/BAO/AL2O3 ko
dc.subject MECHANISM ko
dc.subject TEMPERATURE ko
dc.subject STABILITY ko
dc.subject PLATINUM ko
dc.subject WATER ko
dc.subject OXIDE ko
dc.title Excellent sulfur resistance of Pt/BaO/CeO(2) lean NO(x) trap catalysts ko
dc.title.alternative Excellent sulfur resistance of Pt/BaO/CeO(2) lean NO(x) trap catalysts ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-53949106531 ko
dc.identifier.wosid 000261123600028 ko
dc.type.rims ART ko
dc.description.wostc 35 *
dc.description.scopustc 38 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1016/j.apcatb.2008.05.009 ko
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