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

Do Heui Kim; Ya Huei Chin; George Muntean; Aleksey Yezerets; Neal Currier; William Epling; Hai Ying Chen; Howard Hess; Charles H.F. Peden

doi:10.1021/ie061542d

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

Do Heui Kim, Ya Huei Chin, George Muntean, Aleksey Yezerets, Neal Currier, William Epling, Hai Ying Chen, Howard Hess, Charles H.F. Peden

Research output: Contribution to journal › Article › peer-review

13 Scopus citations

Abstract

A novel reaction protocol was designed to decouple the effects of thermal deactivation from those due to incomplete sulfur removal during desulfation steps of Ba-based lean NO_x 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 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 desulfation 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 desulfation conditions, and to develop desulfation strategies that minimize the separate but often linked deactivation effects of sulfation and high temperatures.

Original language	English
Pages (from-to)	2735-2740
Number of pages	6
Journal	Industrial and Engineering Chemistry Research
Volume	46
Issue number	9
DOIs	https://doi.org/10.1021/ie061542d
State	Published - Apr 25 2007
Externally published	Yes

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Kim, D. H., Chin, Y. H., Muntean, G., Yezerets, A., Currier, N., Epling, W., Chen, H. Y., Hess, H., & Peden, C. H. F. (2007). Design of a reaction protocol for decoupling sulfur removal and thermal aging effects during desulfation of Pt-BaO/Al₂O₃ lean NO_x trap catalysts. Industrial and Engineering Chemistry Research, 46(9), 2735-2740. https://doi.org/10.1021/ie061542d

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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 incomplete sulfur removal during desulfation 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 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 desulfation 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 desulfation conditions, and to develop desulfation strategies that minimize the separate but often linked deactivation effects of sulfation and high temperatures.",

author = "Kim, {Do Heui} and Chin, {Ya Huei} and George Muntean and Aleksey Yezerets and Neal Currier and William Epling and Chen, {Hai Ying} and Howard Hess and Peden, {Charles H.F.}",

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AU - Kim, Do Heui

AU - Chin, Ya Huei

AU - Muntean, George

AU - Yezerets, Aleksey

AU - Currier, Neal

AU - Epling, William

AU - Chen, Hai Ying

AU - Hess, Howard

AU - Peden, Charles H.F.

PY - 2007/4/25

Y1 - 2007/4/25

N2 - A novel reaction protocol was designed to decouple the effects of thermal deactivation from those due to incomplete sulfur removal during desulfation 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 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 desulfation 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 desulfation conditions, and to develop desulfation strategies that minimize the separate but often linked deactivation effects of sulfation and high temperatures.

AB - A novel reaction protocol was designed to decouple the effects of thermal deactivation from those due to incomplete sulfur removal during desulfation 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 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 desulfation 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 desulfation conditions, and to develop desulfation strategies that minimize the separate but often linked deactivation effects of sulfation and high temperatures.

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DO - 10.1021/ie061542d

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 9

ER -

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

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