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

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Nonthermal plasma-assisted catalytic NOx reduction over Ba-Y,FAU: the effect of catalyst preparation

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dc.contributor.author Kwak, Jahun ko
dc.contributor.author Szanyi, Janos Szanyi ko
dc.contributor.author Peden, Charles H.F ko
dc.date.available 2015-07-16T00:43:05Z -
dc.date.created 2015-07-15 ko
dc.date.issued 2003-12 -
dc.identifier.citation JOURNAL OF CATALYSIS, v.220, no.2, pp.291 - 298 ko
dc.identifier.issn 0021-9517 ko
dc.identifier.uri https://scholarworks.unist.ac.kr/handle/201301/12166 -
dc.identifier.uri http://www.sciencedirect.com/science/article/pii/S0021951703003336 ko
dc.description.abstract The effects of catalyst preparation on the NOx reduction activity of a series of Ba-Y,FAU zeolites were investigated using a simulated exhaust gas mixture. The introduction of Ba2+ ions into Na-Y,FAU results in a large increase in their nonthermal plasma-assisted NOx reduction activity. The NOx reduction activities of Ba-Y,FAU catalysts were found to increase with increasing Ba2+ concentration in the aqueous ion-exchange solutions, which translated into increased Ba2+/Na+ ratios in the resulting materials. Consecutive ion-exchange procedures at a given Ba2+ concentration in the aqueous solution, however, did not improve the NOx reduction activities of Ba-Y,FAU catalysts; i.e., the activity of the four times ion-exchanged material was the same as that of the one that was ion-exchanged only once. The reaction profiles for all of these Ba-Y,FAU catalysts were the same. In contrast, a significant increase in NOx reduction activity was observed when a 773 K calcination step was implemented after each solution ion exchange. The reaction profile was also altered as a result of the ion-exchange/calci nation cycles. Calcination that followed each ion-exchange step seems to further increase the Ba2+/Na+ ratio in the zeolite, and in turn increases the NOx reduction activities of the catalysts prepared this way. Key differences in Na- and Ba-Y,FAU catalysts were found in NO2 adsorption and TPD experiments. The amount of chemisorbed NO2 is about twice as high in Ba-Y,FAU than in Na-Y,FAU, and Ba-Y,FAU holds NOx much stronger than Na-Y,FAU. Published by Elsevier Inc ko
dc.description.statementofresponsibility close -
dc.language ENG ko
dc.publisher ACADEMIC PRESS INC ELSEVIER SCIENCE ko
dc.subject plasma-assisted NOx reduction ko
dc.subject Na-Y ko
dc.subject Ba-Y ko
dc.subject ion-exchange ko
dc.subject calcination ko
dc.subject cation redistribution ko
dc.subject NO2 adsorption ko
dc.title Nonthermal plasma-assisted catalytic NOx reduction over Ba-Y,FAU: the effect of catalyst preparation ko
dc.title.alternative Nonthermal plasma-assisted catalytic NOx reduction over Ba-Y,FAU: the effect of catalyst preparation ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-0242643043 ko
dc.identifier.wosid 000186817800005 ko
dc.type.rims ART ko
dc.description.wostc 27 *
dc.description.scopustc 30 *
dc.date.tcdate 2015-12-28 *
dc.date.scptcdate 2015-11-04 *
dc.identifier.doi 10.1016/j.jcat.2003.08.007 ko
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