BROWSE

Related Researcher

Author's Photo

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

ITEM VIEW & DOWNLOAD

Isothermal desulfation of pre-sulfated Pt-BaO/gamma-Al2O3 lean NOx trap catalysts with H-2: The effect of H-2 concentration and the roles of CO2 and H2O

Cited 4 times inthomson ciCited 4 times inthomson ci
Title
Isothermal desulfation of pre-sulfated Pt-BaO/gamma-Al2O3 lean NOx trap catalysts with H-2: The effect of H-2 concentration and the roles of CO2 and H2O
Other Titles
Isothermal desulfation of pre-sulfated Pt-BaO/gamma-Al2O3 lean NOx trap catalysts with H-2: The effect of H-2 concentration and the roles of CO2 and H2O
Author
Kim, Do HeuiKwak, JahunSzanyi, JanosPeden, Charles H. F.
Keywords
IN-SITU FTIR; K-EDGE XANES; STORAGE CATALYSTS; SULFUR DEACTIVATION; EXPOSURE CONDITIONS
Issue Date
2012-01
Publisher
ELSEVIER SCIENCE BV
Citation
APPLIED CATALYSIS B-ENVIRONMENTAL, v.111, no., pp.342 - 348
Abstract
The desulfation mechanisms of pre-sulfated Pt-BaO/gamma-Al2O3 lean NOx trap catalysts were investigated under isothermal conditions (600 degrees C) using H-2 as the reductant. Sulfates were found to be reduced first with H-2 to produce SO2, followed by a reaction between SO2 and H-2 to produce H2S. Gas analysis during the rich pulse reveals that the sulfur removal efficiency is initially proportional to the H-2 concentration. At constant H-2 concentration the overall desulfation efficiency decreases in the order of H-2/CO2/H2O > H-2/CO2 > H-2/H2O > H-2, as confirmed by XPS analysis of residual sulfur in the desulfated samples. H2O limits the evolution of SO2 at an early stage of the rich pulse and enhances the production of H2S in later stages of reduction. CO2 is involved in both the formation of COS and the production of H2O (via the reverse water-gas shift reaction), therefore, resulting in an increased overall efficiency. (C) 2011 Elsevier B.V. All rights reserved
URI
Go to Link
DOI
10.1016/j.apcatb.2011.10.017
ISSN
0926-3373
Appears in Collections:
ECHE_Journal Papers
Files in This Item:
1-s2.0-S0926337311004875-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