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

Do Heui Kim, Ja Hun Kwak, Xianqin Wang, Janos Szanyi, Charles H.F. Peden

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

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 H2 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 H2S. 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 H2 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.

Original languageEnglish (US)
Pages (from-to)183-187
Number of pages5
JournalCatalysis Today
Volume136
Issue number1-2
DOIs
StatePublished - Jul 15 2008
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)

Keywords

  • Desulfation
  • HO effect
  • NO storage
  • Pt sintering
  • Pt/BaO/AlO

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