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

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Sequential high temperature reduction, low temperature hydrolysis for the regeneration of sulfated NOx trap catalysts

Cited 8 times inthomson ciCited 10 times inthomson ci
Title
Sequential high temperature reduction, low temperature hydrolysis for the regeneration of sulfated NOx trap catalysts
Other Titles
Sequential high temperature reduction, low temperature hydrolysis for the regeneration of sulfated NOx trap catalysts
Author
Kim, Do HeuiKwak, JahunWang, XianqinSzanyi, JanosPeden, Charles He
Keywords
NOx storage; Pt/BaO/Al2O3; desulfation; Pt sintering; H2O effect
Issue Date
2008-07
Publisher
ELSEVIER SCIENCE BV
Citation
CATALYSIS TODAY, v.136, no.1-2, pp.183 - 187
Abstract
We describe a new method that minimizes irreversible Pt sintering during the desulfation of sulfated Pt/BaO/Al2O3 lean NOx trap (LNT) catalysts. While it is known that the addition of H2O to H-2 promotes desulfation, we find that the significant and irreversible Pt sintering arising from the presence of water is unavoidable. Control of precious metal sintering is considered to be one of the critical issues in the development of durable LNT catalysts. The new method described here is a sequential desulfation process: the first step is to reduce the sulfates with hydrogen only at higher temperatures to form BaS, followed by a treatment of the thus reduced sample with water at low to moderate temperatures to convert BaS to BaO and H,S. The data showed that Pt sintering was significantly inhibited due to the absence of H2O during the desulfation at high temperatures, and also demonstrates the similar NOx uptake with the desulfated sample cooperatively with H-2 and H2O. This study clearly revealed both positive and negative roles for water in desulfation processes and these factors must be considered when optimizing LNT operation. Published by Elsevier B.V
URI
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DOI
10.1016/j.cattod.2007.12.134
ISSN
0920-5861
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ECHE_Journal Papers
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