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곽자훈

Kwak, Ja Hun
Molecular Catalysis Lab.
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Nonthermal plasma-assisted catalytic NOx reduction over Ba-Y,FAU: the effect of catalyst preparation

Alternative Title
Nonthermal plasma-assisted catalytic NOx reduction over Ba-Y,FAU: the effect of catalyst preparation
Author(s)
Kwak, JahunSzanyi, Janos SzanyiPeden, Charles H.F
Issued Date
2003-12
DOI
10.1016/j.jcat.2003.08.007
URI
https://scholarworks.unist.ac.kr/handle/201301/12166
Fulltext
http://www.sciencedirect.com/science/article/pii/S0021951703003336
Citation
JOURNAL OF CATALYSIS, v.220, no.2, pp.291 - 298
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
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
ISSN
0021-9517

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