BROWSE

Related Researcher

Author's Photo

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

ITEM VIEW & DOWNLOAD

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

Cited 35 times inthomson ciCited 38 times inthomson ci
Title
Excellent sulfur resistance of Pt/BaO/CeO(2) lean NO(x) trap catalysts
Other Titles
Excellent sulfur resistance of Pt/BaO/CeO(2) lean NO(x) trap catalysts
Author
Kwak, Ja HunKim, Do HeuiSzanyi, JanosPeden, Charles H. F.
Keywords
STORAGE-REDUCTION; PT/BAO/AL2O3; MECHANISM; TEMPERATURE; STABILITY; PLATINUM; WATER; OXIDE
Issue Date
2008-12
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.84, no.3-4, pp.545 - 551
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
URI
Go to Link
DOI
10.1016/j.apcatb.2008.05.009
ISSN
0926-3373
Appears in Collections:
ECHE_Journal Papers
Files in This Item:
1-s2.0-S0926337308001823-main.pdf Download

find_unist can give you direct access to the published full text of this article. (UNISTARs only)

Show full item record

qrcode

  • mendeley

    citeulike

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

MENU