File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

곽자훈

Kwak, Ja Hun
Molecular Catalysis Lab.
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

NMR studies of Cu/zeolite SCR catalysts hydrothermally aged with urea

Alternative Title
NMR studies of Cu/zeolite SCR catalysts hydrothermally aged with urea
Author(s)
Cheng, YisunHoard, JohnLambert, ChristineKwak, JahunPeden, Charles H. F.
Issued Date
2008-07
DOI
10.1016/j.cattod.2008.01.019
URI
https://scholarworks.unist.ac.kr/handle/201301/12360
Fulltext
http://www.sciencedirect.com/science/article/pii/S0920586108000369
Citation
CATALYSIS TODAY, v.136, no.1-2, pp.34 - 39
Abstract
The effects of hydrothermal aging of Cu/zeolite urea-selective catalytic reduction (SCR) catalysts on their reactivity and material properties were assessed by performance tests and multiple characterization techniques that included (27)Al nuclear magnetic resonance (NMR) and X-ray diffraction (XRD). Three aging protocols were used that consisted of varying temperature during hydrothermal aging with or without exposure to aqueous urea solution. Differences in behavior were even found for samples hydrothermally aged immediately following exposure to the urea solution or if the sample was dried overnight before hydrothermal aging. The combination of urea and high-temperature exposure increased the deactivation of Cu/zeolite SCR catalysts beyond that observed by hydrothermal aging alone, with an immediate high-temperature exposure following wetting of the catalyst core with aqueous urea causing the most significant deterioration in performance. The impact of urea on SCR catalyst durability was also found to increase with the aging temperature. NMR analysis suggested that aging with urea resulted in relatively more dealumination of the zeolite for the SCR catalysts in this study. (C) 2008 Elsevier B.V. All rights reserved
Publisher
ELSEVIER SCIENCE BV
ISSN
0920-5861
Keyword (Author)
urea SCRCu/zeolitehydrothermal agingurea agingNO(x) reduction
Keyword
REDUCTIONNH3NO

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.