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Title: Design of a reaction protocol for decoupling sulfur removal and thermal aging effects during desulfation of Pt-BaO/Al2O3 lean NOx trap catalysts

Abstract

A novel reaction protocol was designed to decouple the effects of thermal deactivation from those due to, for example, incomplete de-sulfation during regeneration steps of Ba-based lean NOx trap catalysts. The protocol was applied to two samples: a Pt-BaO/Al2O3 model catalyst, and an enhanced model sample doped with promoter species. The results obtained from the reaction protocol demonstrate that regeneration (desulfation) temperatures need to be maintained below those that lead to significant Pt sintering in order to prevent permanent deactivation. In addition, the modified reaction protocol allows us to compare the regeneration behavior of samples with varying degrees of sulfation, while other approaches have difficulty differentiating the effects of thermal aging from those of sulfation. We believe that this approach provides a convenient way both to assess the relative sensitivities of various catalysts to regeneration conditions, and to develop regeneration strategies that minimize the separate but often linked deactivation effects of sulfation and high temperatures.

Authors:
; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
Sponsoring Org.:
USDOE
OSTI Identifier:
909674
Report Number(s):
PNNL-SA-53243
Journal ID: ISSN 0888-5885; IECRED; 19800; VT0401000; TRN: US200723%%5
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Industrial and Engineering Chemistry Research, 46(9):2735-2740; Journal Volume: 46; Journal Issue: 9
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AGING; CATALYSTS; REGENERATION; DESULFURIZATION; PLATINUM; BARIUM OXIDES; ALUMINIUM OXIDES; NITROGEN OXIDES; AIR POLLUTION CONTROL; TEMPERATURE CONTROL; Environmental Molecular Sciences Laboratory

Citation Formats

Kim, Do Heui, Chin, Ya-Huei, Muntean, George G., Yezerets, Aleksey, Currier, Neal, Epling, William S., Chen, Haiying, Hess, Howard .., and Peden, Charles HF. Design of a reaction protocol for decoupling sulfur removal and thermal aging effects during desulfation of Pt-BaO/Al2O3 lean NOx trap catalysts. United States: N. p., 2007. Web. doi:10.1021/ie061542d.
Kim, Do Heui, Chin, Ya-Huei, Muntean, George G., Yezerets, Aleksey, Currier, Neal, Epling, William S., Chen, Haiying, Hess, Howard .., & Peden, Charles HF. Design of a reaction protocol for decoupling sulfur removal and thermal aging effects during desulfation of Pt-BaO/Al2O3 lean NOx trap catalysts. United States. doi:10.1021/ie061542d.
Kim, Do Heui, Chin, Ya-Huei, Muntean, George G., Yezerets, Aleksey, Currier, Neal, Epling, William S., Chen, Haiying, Hess, Howard .., and Peden, Charles HF. Wed . "Design of a reaction protocol for decoupling sulfur removal and thermal aging effects during desulfation of Pt-BaO/Al2O3 lean NOx trap catalysts". United States. doi:10.1021/ie061542d.
@article{osti_909674,
title = {Design of a reaction protocol for decoupling sulfur removal and thermal aging effects during desulfation of Pt-BaO/Al2O3 lean NOx trap catalysts},
author = {Kim, Do Heui and Chin, Ya-Huei and Muntean, George G. and Yezerets, Aleksey and Currier, Neal and Epling, William S. and Chen, Haiying and Hess, Howard .. and Peden, Charles HF},
abstractNote = {A novel reaction protocol was designed to decouple the effects of thermal deactivation from those due to, for example, incomplete de-sulfation during regeneration steps of Ba-based lean NOx trap catalysts. The protocol was applied to two samples: a Pt-BaO/Al2O3 model catalyst, and an enhanced model sample doped with promoter species. The results obtained from the reaction protocol demonstrate that regeneration (desulfation) temperatures need to be maintained below those that lead to significant Pt sintering in order to prevent permanent deactivation. In addition, the modified reaction protocol allows us to compare the regeneration behavior of samples with varying degrees of sulfation, while other approaches have difficulty differentiating the effects of thermal aging from those of sulfation. We believe that this approach provides a convenient way both to assess the relative sensitivities of various catalysts to regeneration conditions, and to develop regeneration strategies that minimize the separate but often linked deactivation effects of sulfation and high temperatures.},
doi = {10.1021/ie061542d},
journal = {Industrial and Engineering Chemistry Research, 46(9):2735-2740},
number = 9,
volume = 46,
place = {United States},
year = {Wed Apr 25 00:00:00 EDT 2007},
month = {Wed Apr 25 00:00:00 EDT 2007}
}