Effect of sulfur loading on the desulfation chemistry of a commercial lean NOx trap catalyst

Do Heui Kim; Aleksey Yezerets; Junhui Li; Neal Currier; Hai Ying Chen; Howard Hess; Mark H. Engelhard; George G. Muntean; Charles H.F. Peden

doi:10.1016/j.cattod.2012.05.040

Effect of sulfur loading on the desulfation chemistry of a commercial lean NOx trap catalyst

Do Heui Kim, Aleksey Yezerets, Junhui Li, Neal Currier, Hai Ying Chen, Howard Hess, Mark H. Engelhard, George G. Muntean, Charles H.F. Peden

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

9 Scopus citations

Abstract

We investigate the effects of initial sulfur loadings on the desulfation chemistry and subsequent final activity of a commercial LNT catalyst. Identical total amounts of SO ₂ are applied to the samples, albeit with the frequency of desulfation varied. The results indicate that performance is better with less frequent desulfations. The greater the amount of sulfur deposited before desulfation, the more amount of SO ₂ evolution before H ₂S is observed during desulfation, which can be explained by two sequential reactions; initial conversion of sulfate to SO ₂, followed by the reduction of SO ₂ to H ₂S. After completing all sulfation/desulfation steps, the sample with only a single desulfation results in a fairly uniform sulfur distribution along the z-axis inside of the monolith. We expect that the results obtained in this study will provide useful information for optimizing regeneration strategies in vehicles that utilize the LNT technology.

Original language	English
Pages (from-to)	3-8
Number of pages	6
Journal	Catalysis Today
Volume	197
Issue number	1
DOIs	https://doi.org/10.1016/j.cattod.2012.05.040
State	Published - Dec 15 2012
Externally published	Yes

Funding

The authors thank Professor Pio Forzatti for his many years of excellent research on the general topic of our paper; it has informed and inspired many of our studies. We are pleased to make this contribution to the special issue of Catalysis Today in honor of his 65th birthday, for which we congratulate and send him our best wishes. Financial support for our research was provided by the U.S. Department of Energy (DOE) , Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Program . The work was performed in the Environmental Molecular Sciences Laboratory (EMSL) at Pacific Northwest National Laboratory (PNNL). The EMSL is a national scientific user facility and supported by the U.S. DOE, Office of Science, Biological and Environmental Research Program. PNNL is a multi-program national laboratory operated for the U.S. DOE by Battelle.

Funders	Funder number
Biological and Environmental Research program
U.S. Department of Energy
Office of Science
Office of Energy Efficiency and Renewable Energy

Keywords

Commercial LNT
Desulfation
Sulfur
Sulfur loading
XPS

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10.1016/j.cattod.2012.05.040

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title = "Effect of sulfur loading on the desulfation chemistry of a commercial lean NOx trap catalyst",

abstract = "We investigate the effects of initial sulfur loadings on the desulfation chemistry and subsequent final activity of a commercial LNT catalyst. Identical total amounts of SO 2 are applied to the samples, albeit with the frequency of desulfation varied. The results indicate that performance is better with less frequent desulfations. The greater the amount of sulfur deposited before desulfation, the more amount of SO 2 evolution before H 2S is observed during desulfation, which can be explained by two sequential reactions; initial conversion of sulfate to SO 2, followed by the reduction of SO 2 to H 2S. After completing all sulfation/desulfation steps, the sample with only a single desulfation results in a fairly uniform sulfur distribution along the z-axis inside of the monolith. We expect that the results obtained in this study will provide useful information for optimizing regeneration strategies in vehicles that utilize the LNT technology.",

keywords = "Commercial LNT, Desulfation, Sulfur, Sulfur loading, XPS",

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AU - Kim, Do Heui

AU - Yezerets, Aleksey

AU - Li, Junhui

AU - Currier, Neal

AU - Chen, Hai Ying

AU - Hess, Howard

AU - Engelhard, Mark H.

AU - Muntean, George G.

AU - Peden, Charles H.F.

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KW - Commercial LNT

KW - Desulfation

KW - Sulfur

KW - Sulfur loading

KW - XPS

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Effect of sulfur loading on the desulfation chemistry of a commercial lean NOx trap catalyst

Abstract

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Keywords

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