Comparison of NO                         x                          Adsorption/Desorption Behaviors over Pd/CeO                         2                          and Pd/SSZ-13 as Passive NO                         x                          Adsorbers for Cold Start Application

Yongwoo Kim; Sungha Hwang; Jaeha Lee; Young Seok Ryou; Hyokyoung Lee; Chang Hwan Kim; Do Heui Kim

doi:10.1007/s40825-019-00119-0

Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application

Yongwoo Kim, Sungha Hwang, Jaeha Lee, Young Seok Ryou, Hyokyoung Lee, Chang Hwan Kim, Do Heui Kim

Department of Applied Chemistry

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

33 Scopus citations

Abstract

Passive NO _x adsorber (PNA) is one of the promising technologies for reducing NO _x emissions from vehicles during cold start periods. Precious metals supported on metal oxide and zeolite have been extensively investigated as PNA materials. Hence, it is worthwhile to compare two typical PNA materials, Pd/CeO ₂ and Pd/SSZ-13, so as to understand the differences between them. The NO _x adsorption/desorption experiments were carried out under varying NO/NO ₂ ratios, and the result indicated that the NO _x adsorption/desorption mechanisms on Pd/CeO ₂ and Pd/SSZ-13 are completely different. Specifically, NO and NO ₂ were competitively adsorbed on Pd/SSZ-13, while the NO adsorption on Pd/CeO ₂ was promoted by NO ₂ . This difference is attributed to different adsorption sites: NO _x is adsorbed on the ceria surface in Pd/CeO ₂ , whereas it is adsorbed on atomic Pd ²⁺ sites in Pd/SSZ-13, according to DRIFTS spectra in this study. In addition, the effect of sulfur poisoning was investigated as well. Pd/SSZ-13 showed moderate sulfur tolerance, while Pd/CeO ₂ completely lost its PNA ability after sulfur aging.

Original language	English
Pages (from-to)	172-182
Number of pages	11
Journal	Emission Control Science and Technology
Volume	5
Issue number	2
DOIs	https://doi.org/10.1007/s40825-019-00119-0
State	Published - 15 Jun 2019

Keywords

Cold start
Low temperature NO adsorption
NO adsorption site
Passive NO adsorber (PNA)
Pd/CeO
Pd/SSZ-13

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10.1007/s40825-019-00119-0

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Kim, Y., Hwang, S., Lee, J., Ryou, Y. S., Lee, H., Kim, C. H., & Kim, D. H. (2019). Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application Emission Control Science and Technology, 5(2), 172-182. https://doi.org/10.1007/s40825-019-00119-0

Kim, Yongwoo ; Hwang, Sungha ; Lee, Jaeha et al. / Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application In: Emission Control Science and Technology. 2019 ; Vol. 5, No. 2. pp. 172-182.

@article{2f516a3d743c48eabe3a6bd36a4adfc3,

title = " Comparison of NO x Adsorption/Desorption Behaviors over Pd/CeO 2 and Pd/SSZ-13 as Passive NO x Adsorbers for Cold Start Application ",

abstract = " Passive NO x adsorber (PNA) is one of the promising technologies for reducing NO x emissions from vehicles during cold start periods. Precious metals supported on metal oxide and zeolite have been extensively investigated as PNA materials. Hence, it is worthwhile to compare two typical PNA materials, Pd/CeO 2 and Pd/SSZ-13, so as to understand the differences between them. The NO x adsorption/desorption experiments were carried out under varying NO/NO 2 ratios, and the result indicated that the NO x adsorption/desorption mechanisms on Pd/CeO 2 and Pd/SSZ-13 are completely different. Specifically, NO and NO 2 were competitively adsorbed on Pd/SSZ-13, while the NO adsorption on Pd/CeO 2 was promoted by NO 2 . This difference is attributed to different adsorption sites: NO x is adsorbed on the ceria surface in Pd/CeO 2 , whereas it is adsorbed on atomic Pd 2+ sites in Pd/SSZ-13, according to DRIFTS spectra in this study. In addition, the effect of sulfur poisoning was investigated as well. Pd/SSZ-13 showed moderate sulfur tolerance, while Pd/CeO 2 completely lost its PNA ability after sulfur aging.",

keywords = "Cold start, Low temperature NO adsorption, NO adsorption site, Passive NO adsorber (PNA), Pd/CeO, Pd/SSZ-13",

author = "Yongwoo Kim and Sungha Hwang and Jaeha Lee and Ryou, {Young Seok} and Hyokyoung Lee and Kim, {Chang Hwan} and Kim, {Do Heui}",

note = "Publisher Copyright: {\textcopyright} 2019, Springer Nature Switzerland AG.",

year = "2019",

month = jun,

day = "15",

doi = "10.1007/s40825-019-00119-0",

language = "English",

volume = "5",

pages = "172--182",

journal = "Emission Control Science and Technology",

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Kim, Y, Hwang, S, Lee, J, Ryou, YS, Lee, H, Kim, CH & Kim, DH 2019, ' Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application ', Emission Control Science and Technology, vol. 5, no. 2, pp. 172-182. https://doi.org/10.1007/s40825-019-00119-0

Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application . / Kim, Yongwoo; Hwang, Sungha; Lee, Jaeha et al.
In: Emission Control Science and Technology, Vol. 5, No. 2, 15.06.2019, p. 172-182.

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

TY - JOUR

T1 - Comparison of NO x Adsorption/Desorption Behaviors over Pd/CeO 2 and Pd/SSZ-13 as Passive NO x Adsorbers for Cold Start Application

AU - Kim, Yongwoo

AU - Hwang, Sungha

AU - Lee, Jaeha

AU - Ryou, Young Seok

AU - Lee, Hyokyoung

AU - Kim, Chang Hwan

AU - Kim, Do Heui

PY - 2019/6/15

Y1 - 2019/6/15

N2 - Passive NO x adsorber (PNA) is one of the promising technologies for reducing NO x emissions from vehicles during cold start periods. Precious metals supported on metal oxide and zeolite have been extensively investigated as PNA materials. Hence, it is worthwhile to compare two typical PNA materials, Pd/CeO 2 and Pd/SSZ-13, so as to understand the differences between them. The NO x adsorption/desorption experiments were carried out under varying NO/NO 2 ratios, and the result indicated that the NO x adsorption/desorption mechanisms on Pd/CeO 2 and Pd/SSZ-13 are completely different. Specifically, NO and NO 2 were competitively adsorbed on Pd/SSZ-13, while the NO adsorption on Pd/CeO 2 was promoted by NO 2 . This difference is attributed to different adsorption sites: NO x is adsorbed on the ceria surface in Pd/CeO 2 , whereas it is adsorbed on atomic Pd 2+ sites in Pd/SSZ-13, according to DRIFTS spectra in this study. In addition, the effect of sulfur poisoning was investigated as well. Pd/SSZ-13 showed moderate sulfur tolerance, while Pd/CeO 2 completely lost its PNA ability after sulfur aging.

AB - Passive NO x adsorber (PNA) is one of the promising technologies for reducing NO x emissions from vehicles during cold start periods. Precious metals supported on metal oxide and zeolite have been extensively investigated as PNA materials. Hence, it is worthwhile to compare two typical PNA materials, Pd/CeO 2 and Pd/SSZ-13, so as to understand the differences between them. The NO x adsorption/desorption experiments were carried out under varying NO/NO 2 ratios, and the result indicated that the NO x adsorption/desorption mechanisms on Pd/CeO 2 and Pd/SSZ-13 are completely different. Specifically, NO and NO 2 were competitively adsorbed on Pd/SSZ-13, while the NO adsorption on Pd/CeO 2 was promoted by NO 2 . This difference is attributed to different adsorption sites: NO x is adsorbed on the ceria surface in Pd/CeO 2 , whereas it is adsorbed on atomic Pd 2+ sites in Pd/SSZ-13, according to DRIFTS spectra in this study. In addition, the effect of sulfur poisoning was investigated as well. Pd/SSZ-13 showed moderate sulfur tolerance, while Pd/CeO 2 completely lost its PNA ability after sulfur aging.

KW - Cold start

KW - Low temperature NO adsorption

KW - NO adsorption site

KW - Passive NO adsorber (PNA)

KW - Pd/CeO

KW - Pd/SSZ-13

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U2 - 10.1007/s40825-019-00119-0

DO - 10.1007/s40825-019-00119-0

M3 - Article

AN - SCOPUS:85064682756

SN - 2199-3629

VL - 5

SP - 172

EP - 182

JO - Emission Control Science and Technology

JF - Emission Control Science and Technology

IS - 2

ER -

Kim Y, Hwang S, Lee J, Ryou YS, Lee H, Kim CH et al. Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application Emission Control Science and Technology. 2019 Jun 15;5(2):172-182. doi: 10.1007/s40825-019-00119-0

Comparison of NO _x Adsorption/Desorption Behaviors over Pd/CeO ₂ and Pd/SSZ-13 as Passive NO _x Adsorbers for Cold Start Application

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