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곽자훈

Kwak, Ja Hun
Molecular Catalysis Lab.
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Effects of Ba loading and calcination temperature on BaAl2O4 formation for BaO/Al2O3 NOx storage and reduction catalysts

Alternative Title
Effects of Ba loading and calcination temperature on BaAl2O4 formation for BaO/Al2O3 NOx storage and reduction catalysts
Author(s)
Szailer, Tama´sKwak, JahunKim, Do HeuiSzanyi, Ja´nosWang, ChongminPeden, Charles H.F.
Issued Date
2006-04
DOI
10.1016/j.cattod.2006.02.016
URI
https://scholarworks.unist.ac.kr/handle/201301/12185
Fulltext
http://www.sciencedirect.com/science/article/pii/S0920586106000666#
Citation
CATALYSIS TODAY, v.114, no.1, pp.86 - 93
Abstract
The effect of thermal treatment on the structure and chemical properties of Ba-oxide-based NOx storage/reduction catalysts with different Ba loadings was investigated using BET, TEM, EDS, TPD and FT-IR techniques. On the basis of the present and previously reported results, we propose that moderate ( 8 wt.% BaO), small (similar to 5 nm) particles of 'bulk' BaO are present on top of the one ML BaO/Al2O3 surface. We did not observe any detectable morphological changes upon higher temperature thermal treatment of 2 and 8 wt.% BaO/Al2O3 samples, while dramatic changes occurred for the 20 wt.% sample. In this latter case, the transformations included BaAl2O4 formation at the expense of the bulk BaO phase. In particular, we conclude that the surface (ML) BaO phase is quite stable against thermal treatment, while the bulk phase provides the source of Ba for BaAl2O4 formation. (c) 2006 Elsevier B.V. All rights reserved
Publisher
ELSEVIER SCIENCE BV
ISSN
0920-5861
Keyword (Author)
BaO/Al2O3NOx storage/reductioncatalyst morphology
Keyword
FT-IRADSORPTION

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